Updated on 2024/02/02

写真a

 
NAKASO Koichi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • 博士(工学) ( 2003.3   広島大学 )

  • 修士(工学) ( 2000.3   広島大学 )

  • 学士(工学) ( 1998.3   広島大学 )

Research Interests

  • Chemical Engineering

  • Powder Technology

  • Thermal Energy Storage

  • Heat Transfer Enhancement

  • Thermal Engineering

Research Areas

  • Nanotechnology/Materials / Energy chemistry

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Transport phenomena and unit operations

Education

  • Hiroshima University   大学院工学研究科   移動現象工学専攻博士課程後期

    2000.4 - 2003.3

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  • Hiroshima University   大学院工学研究科   移動現象工学専攻博士課程前期

    1998.4 - 2000.3

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  • Hiroshima University   工学部  

    1994.4 - 1998.3

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Research History

  • Okayama University   学術研究院 環境生命自然科学学域

    2023.4

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  • Okayama University   学術研究院 自然科学学域   Associate Professor

    2021.4 - 2023.3

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    Country:Japan

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  • Okayama University   Graduate School of Natural Science and Technology   Associate Professor

    2016.10 - 2021.3

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  • University of Illinois at Chicago, U.S.A.   Visiting Researcher

    2011.7 - 2011.9

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  • Kyushu University   Graduate School of Engineering   Assistant Professor

    2007.4 - 2016.9

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  • Kyushu University   Graduate School of Engineering   Research Associate

    2003.4 - 2007.3

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  • JSPS Research Fellowships for Young Scientists (DC1)

    2000.4 - 2003.3

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Professional Memberships

  • Japanese Society of Latent Heat Engineers

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  • JAPAN SOCIETY OF REFRIGERATING AND AIR CONDITIONING ENGINEERS

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  • THE SOCIETY OF POWDER TECHNOLOGY, JAPAN

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  • THE IRON AND STEEL INSTITUTE OF JAPAN

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  • THE HEAT TRANSFER SOCIETY OF JAPAN

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  • THE SOCIETY OF CHEMICAL ENGINEERS, JAPAN

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  • JAPAN ASSOCIATION OF AEROSOL SCIENCE AND TECHNOLOGY

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Committee Memberships

  •   化学工学会 熱工学部会 部会長  

    2023   

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    Committee type:Academic society

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  •   中四国熱科学・工学研究会 事務局  

    2022.4   

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  •   日本エアロゾル学会 編集委員  

    2020   

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  • 日本伝熱学会 蓄熱技術社会実装研究会   幹事  

    2019.5   

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    Committee type:Academic society

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  • 国立研究開発法人新エネルギー・産業技術総合開発機構(NEDO)   NEDO技術委員  

    2018.3 - 2023.3   

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    Committee type:Academic society

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  •   日本潜熱工学研究会 幹事  

    2017   

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  • 日本鉄鋼協会 未利用熱エネルギー有効活用研究会   委員  

    2016.4 - 2019.3   

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  • 化学工学会 熱工学部会   企画幹事  

    2015 - 2020   

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    Committee type:Academic society

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  • 化学工学会 熱工学部会   会計幹事  

    2011 - 2014   

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  • 化学工学会 熱工学部会   広報,ホームページ管理  

    2004 - 2012   

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    Committee type:Academic society

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Papers

  • Qualitative Evaluation of Relation between Mixing Uniformity of Binder and Strength of Compression Molded Tablet

    Kuniaki Gotoh, Yuka Yoshimura, Yasushi Mino, Koichi Nakaso

    Journal of the Society of Powder Technology, Japan   60 ( 11 )   663 - 668   2023.11

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    Publishing type:Research paper (scientific journal)   Publisher:The Society of Powder Technology, Japan  

    DOI: 10.4164/sptj.60.663

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  • Numerical Simulations of Particle Suspensions under Shear Flow Using a Combined Lattice Boltzmann and Discrete Element Method

    Yasushi Mino, Hazuki Tanaka, Koichi Nakaso, Kuniaki Gotoh

    Journal of the Society of Powder Technology, Japan   60 ( 10 )   607 - 612   2023.10

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    Publishing type:Research paper (scientific journal)   Publisher:The Society of Powder Technology, Japan  

    DOI: 10.4164/sptj.60.607

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  • Numerical simulation of a drying colloidal suspension on a wettable substrate using the lattice Boltzmann method Reviewed

    Yasushi Mino, Chika Tanaka, Hazuki Tanaka, Koichi Nakaso, Kuniaki Gotoh

    Chemical Engineering Science   263   118050 - 118050   2022.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    A computational method based on the lattice Boltzmann method (LBM) is developed to simulate a drying colloidal suspension on a wettable substrate. In this method, solid particles moving in the fluid are treated with an improved smoothed-profile LBM, and the liquid-vapor system is described by the free-energy LBM. To represent solvent evaporation dominated by density gradients, the density at the boundary of the simulation domain is specified to be lower than the equilibrium vapor density. We simulated the drying of a colloidal suspension on a wettable substrate and found that particles with higher wettability aggregated more slowly, but the aggregation proceeded more significantly. This result can be explained based on capillary interactions (i.e., capillary flotation force and capillary immersion force) between the particles. The proposed method can effectively simulate the particle arrangement process induced by the evaporation of the solvent from a colloidal suspension on a wettable substrate. CO 2022 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ces.2022.118050

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  • Effect of Spray Temperature Conditions on Droplet Size Distribution by a Rotating Disk Reviewed

    Nanako Harada, Ayumi Shimizu, Koichi Nakaso, Yasushi Mino, Kuniaki Gotoh

    KAGAKU KOGAKU RONBUNSHU   48 ( 5 )   167 - 174   2022.9

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Chemical Engineers, Japan  

    The size and morphology of particles generated by a spray dryer strongly depend on the atomization process because it is the initial stage of the process. In a practical apparatus, a rotating disk atomizer is exposed to the hot dry air, while liquid raw material is usually kept at room temperature. In this study, the effect of the temperature condition on the droplet size distributions is, therefore, investigated using ion-exchanged water and castor oil. Not only the temperature of liquid raw material, but also the temperature of the rotating disk are individually controlled in the experiment. As a result, the droplet size distribution was strongly influenced by the difference between liquid and disk temperatures. When the temperature difference was large, bimodal droplet size distributions were observed. On the contrary, mono -modal size distributions were obtained for the smaller temperature differences. Furthermore, when temperature of disk was much higher than that of the liquid raw material, film flow locally fluctuated on the rotating disk was observed. According to these results, droplet size distributions could be affected by the stability of liquid film flow on the rotating disk. When the temperature difference between liquid and disk is large, the physical properties of the liquid raw materi-al near the disk surface would be changed. In particular, when the temperature of the disk is higher than that of liquid, local density and viscosity near the disk surface are always smaller than those of the upper bulk liquid, respectively. Such two-layer flow could lead to unstable film flow. Thus, the distributions of droplet size could be characterized by the temperature dependence of physical properties of the liquid raw material.

    DOI: 10.1252/kakoronbunshu.48.167

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  • Lattice Boltzmann model for capillary interactions between particles at a liquid-vapor interface under gravity

    Yasushi Mino, Hazuki Tanaka, Koichi Nakaso, Kuniaki Gotoh, Hiroyuki Shinto

    PHYSICAL REVIEW E   105 ( 4 )   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    A computational technique based on the lattice Boltzmann method (LBM) is developed to simulate the wettable particles adsorbed to a liquid-vapor interface under gravity. The proposed technique combines the improved smoothed-profile LBM for the treatment of moving solid particles in a fluid and the free-energy LBM for the description of a liquid-vapor system. Five benchmark two-dimensional problems are examined: (A) a stationary liquid drop in the vapor phase; a wettable particle adsorbed to a liquid-vapor interface in (B) the absence and (C) the presence of gravity; (D) two freely moving particles at a liquid-vapor interface in the presence of gravity (i.e., capillary flotation forces); and (E) two vertically constrained particles at a liquid-vapor interface (i.e., capillary immersion forces). The simulation results are in good quantitative agreement with theoretical estimations, demonstrating that the proposed technique can reproduce the capillary interactions between wettable particles at a liquid-vapor interface under gravity.

    DOI: 10.1103/PhysRevE.105.045316

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  • Measurement of Apparent Powder Viscosity by Tuning-fork Vibration Viscometer Reviewed

    後藤邦彰, 余越康隆, 中曽浩一, 三野泰志, 石塚英樹, 西塚昌弘

    粉体工学会誌   58 ( 5 )   250 - 254   2021.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Evaluation of Flowability of Wet Granular Materials by Stirring Torque: Effects of Additive Liquid Viscosity on Flowability Reviewed

    三野泰志, 新倉丸也, 中曽浩一, 後藤邦彰

    粉体工学会誌   58 ( 5 )   234 - 237   2021.5

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  • Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

    Linsheng Zhang, Song Ye, Bing Xue, Xinli Wei, Koichi Nakaso, Jun Fukai

    International Journal of Energy Research   44 ( 7 )   5634 - 5648   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/er.5312

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/er.5312

  • Experimental study of heat and mass recovery on steam generation in an adsorption heat pump with composite zeolite-CaCl2 Reviewed

    Song Ye, Bing Xue, Xiangrui Meng, Xinli Wei, Koichi Nakaso, Jun Fukai

    Sustainable Cities and Society   52   101808 - 101808   2020.1

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.scs.2019.101808

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  • Development of Chemical Cold Generation System from Unused Thermal Energy Reviewed

    Koichi Nakaso, Yui Tsutsui, Hiiro Takahashi, Yasushi Mino, Kuniaki Gotoh, Nobuhiro Maruoka, Hiroshi Nogami

    Tetsu-to-Hagane   106 ( 8 )   556 - 563   2020

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    Publishing type:Research paper (scientific journal)   Publisher:Iron and Steel Institute of Japan  

    DOI: 10.2355/tetsutohagane.tetsu-2019-125

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  • Numerical Simulation of Wetting Phenomena on Solid Surface Using Free-energy Lattice Boltzmann Method Reviewed

    山本知世, 三野泰志, 中曽浩一, 後藤邦彰

    粉体工学会誌   56 ( 10 )   550 - 555   2019.10

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    Language:Japanese  

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  • 青色無機顔料コバルトブルーの色調におよぼすコバルト原料化合物の影響 Reviewed

    米田 美佳, 辰己 祐哉, 三野 泰志, 中曽 浩一, 後藤 邦彰, 中西 真, 藤井 達生, 小西 康裕, 野村 俊之

    粉体工学会誌   56 ( 8 )   446 - 451   2019.8

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  • Influence of cobalt source compounds on the color tone of cobalt blue inorganic pigment

    Mika Yoneda, Yuya Tatsumi, Yasushi Mino, Koichi Nakaso, Kuniaki Gotoh, Makoto Nakanishi, Tatsuo Fujii, Yasuhiro Konishi, Toshiyuki Nomura

    Journal of the Society of Powder Technology, Japan   56 ( 8 )   446 - 451   2019

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    The color tone of pigments is affected by various factors such as crystal structure and particle size. These characteristics should be determined by synthesis condition. In this study, the influence of cobalt source on the color tone of cobalt blue pigment was investigated. Cobalt blue (CoAl2O4) was synthesized by solid-state reaction method. Co3O4 and Co(OH)2 with two different particle sizes were used as the cobalt source, and γ-Al2O3 was used as the aluminum source. The products were characterized by spectrophotometry, XRD, SEM, and TG/DTA. It was revealed that the chroma of the synthesized cobalt blue depends on the cobalt source. The cobalt blue synthesized using smaller size Co(OH)2 showed most vivid color. It was suggested that the number of the contact points between the starting materials increased with decreasing the particle size, leading to the progress of the reaction.

    DOI: 10.4164/sptj.56.446

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  • CO2ヒートポンプ飲料自動販売機における潜熱蓄熱槽の利用 Reviewed

    藤井秀俊, 佐藤秀昭, 粕谷潤一郎, 小坂梨奈, 中曽浩一, 深井潤

    日本冷凍空調学会論文集   35 ( 1 )   35 - 47   2018

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  • Performance test for scale-up characteristics of adsorption steam generators Reviewed

    Koichi Nakaso, Jun Fukai, Tsuguhiko Nakagawa, Kasumi Ito, Yoshio Abe, Yoshiaki Kawakami, Masayuki Tanino, Yoshinori Itaya, Nobusuke Kobayashi, Kenji Marumo, Toshiyuki Aoyama, Tatsuya Masui

    Kagaku Kogaku Ronbunshu   44 ( 1 )   71 - 77   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Chemical Engineers, Japan  

    The performance of steam generators to generate high-temperature steam using waste heat from industrial processes was investigated. Two types of steam generators were constructed. One is a bench-scale cylindrical generator having similar structure to the laboratory-scale reactor used in the authors’ previous research. The other is a scaled-up generator whose flow passage area is extended to store a large amount of adsorbent for further scale-up on practical application. Temperature measurements in the bench-scale generator in the atmospheric steam generation process showed that a high-temperature region is formed above the water level due to adsorption of water vapor, while a low-temperature region below saturation temperature is formed below the water level. The mass of steam generate d per unit mass of adsorbent increased with increasing energy supplied from the regeneration air and approached an asymptotic value depending on the temperature of the regeneration air. The mass of steam generated per unit mass of adsorbent increased with decreasing heat capacity of the generator.

    DOI: 10.1252/kakoronbunshu.44.71

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  • Effect of coating mixing conditions on the color tone of cobalt blue pigment having a core-shell structure obtained by solid phase synthesis of coated particles Reviewed

    Yuya Tatsumi, Mika Yoneda, Yasushi Mino, Koichi Nakaso, Kuniaki Gotoh, Toshiyuki Nomura

    Journal of the Society of Powder Technology, Japan   55 ( 3 )   165 - 170   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Powder Technology  

    A cobalt blue pigment having a core/shell structure was synthesized by solid phase synthesis of coated particles having Co(OH)2 particles adhered onto Al2O3 particles. In this research, the effect of mixing conditions on the color tone of synthesized pigment was investigated. As a result, it was found that the mixing time greatly affected the amount of adhered Co source particles, and the pressing force during mixing affected inhomogeneity of adhered amount of Co source particle on Al source particle surface. However, it was found that the inhomogeneity of the amount of Co source particles is small as the influence on the color tone of the calcinated product by diffusing onto the alumina surface of Co ions during calcination at high temperature. In addition, when the mixing conditions were not appropriate and the coating amount of the Co source particles on the Al source particles was small, the lightness of the product was high and the chroma was low. One reason for this is considered to be a decrease in the shell thickness generated by the decrease in the amount of Co source particles deposited. It was also suggested that the formation of black tri-cobalt tetroxide, which is an unreacted Co source not adhering to the Al source particles, is also the reason of the decrease of chroma of the product.

    DOI: 10.4164/sptj.55.165

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  • Generation of High-Temperature Steam From Unused Thermal Energy by a Novel Adsorption Heat Pump Reviewed

    Koichi Nakaso, Shotaro Eshima, Jun Fukai

    INTERNATIONAL CONFERENCE ON ENGINEERING, SCIENCE AND NANOTECHNOLOGY 2016 (ICESNANO 2016)   1788   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER INST PHYSICS  

    For the effective utilization of unused thermal energy, the novel adsorption heat pump system for generating high-temperature steam is proposed. This system adopts a direct heat exchange method to the adsorption heat pump to increase heat transfer rate between adsorbent and heat transfer fluid. The heat pump system consists of two processes: steam generation process and regeneration process. In the steam generation process, water is directly introduced to the adsorbent. In the regeneration process, dry gas is introduced to the adsorbent. In this study, the performance of the system is numerically evaluated. The efficiency of the heat pump system is calculated by the ratio of enthalpy of product steam to input energy. To calculate the enthalpy of steam, mass of steam generated is estimated based on the progress of the regeneration process. Input energy of the heat pump system consists of the blower power to introduce dry gas and the thermal energy to heat dry gas. The effect of the operating condition on the performance of the steam generation process is studied. It is found there is the appropriate regeneration time to maximize the efficiency of the heat pump system.

    DOI: 10.1063/1.4968252

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  • Sensitivity analysis of coal gasification in two-stage entrained?ow Gasifer Reviewed

    M. S. Alam, A. T. Wijayanta, K. Nakaso, J. Fukai

    Journal of Thermal Engineering   3 ( 6 )   1574 - 1587   2017

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  • Effect of particle size on superheated steam generation in a zeolite-water adsorption heat transformer Reviewed

    Bing Xue, Xinli Wei, Koichi Nakaso, Jun Fukai

    Special Topics and Reviews in Porous Media   7 ( 4 )   309 - 320   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Begell House Inc.  

    An adsorption heat transformer system based on a direct-contact heat exchange method to elevate the hot water temperature level has been proposed. Superheated steam over 150°C was directly generated from hot water. A mathematical model is developed to investigate the effect of zeolite particle size on the transient mass and heat transfer during the generation process. This model features a three-phase calculation and a moving water-gas interface. The calculations are conducted in the zeolite-water and zeolite-gas regions. The numerical results show the maximum temperature in both zeolite and the generated steam gradually decreases as the zeolite particle size increases.Meanwhile, the adsorption rate becomes slower, which takes longer for the packed bed to achieve adsorption equilibrium. The steam generation time is the same for different particle sizes, while the average steam generation temperature declines with the increase in particle sizes. After the preheating process, the maximum temperature in steam slightly decreases for small particle size but obviously increases for large particle size. The gross temperature lifts are the same regardless of the changes in particle size. The steam generation time remarkably expands to almost the whole range of the process. The average temperature for steam generation is dramatically upgraded for large sized particles with the preheating process. Future work will focus on experiments for different sizes of zeolite and packing density to enhance the steam generation process.

    DOI: 10.1615/SpecialTopicsRevPorousMedia.2016017261

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  • Numerical Simulation of Entrained-?flow Coal Gasi?fication: A Study on Particles History Reviewed

    Md. Saiful Alam, Agung Tri Wijayanta, Koichi Nakaso, Jun Fukai

    Journal of Energy Environment and Carbon Credits   6 ( 3 )   9 - 18   2016

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  • Study on coal gasification with soot formation in two-stage entrained-flow gasifier Reviewed

    Md. Saiful Alam, Agung Tri Wijayanta, Koichi Nakaso, Jun Fukai

    International Journal of Energy and Environmental Engineering   6 ( 3 )   255 - 265   2015.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Verlag  

    Concerning the global warming due to large CO&lt
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    emission, the efficient use of coal becomes important for getting sustainable energy production. Coal gasification under CO&lt
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    -rich condition is expected to be an effective way to produce a concentrated and pressurized carbon dioxide stream, resulting in reduction in separation energy of CO&lt
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    for CCS. Moreover, the soot formation, which is of significant environmental concern, is still being neglected in the past studies of coal gasification. A one-step soot formation reaction mechanism is proposed in this study and implemented in numerical simulations of coal gasification with the aim of describing the gasification behaviors in a two-stage entrained-flow gasifier. In addition, the effects of O&lt
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    ratio and CO&lt
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    concentration on soot concentration, syngas heating value and carbon conversion are numerically studied in an effort to increase the syngas production. The Eulerian–Lagrangian approach is applied to solve the Navier–Stokes equation and the particle dynamics. Finite rate/eddy dissipation model is used to calculate the rate of nine homogeneous gas-to-gas phase reactions including soot formation and soot oxidation. While only finite rate is used for the heterogeneous solid-to-gas phase reactions. It is found that formation of soot enhances the H&lt
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    production in the gasifier. Carbon conversion gradually increases with an increase in O&lt
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    ratio, while producing a low heating value syngas beyond a certain limit of O&lt
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    ratio. In contrast, an increase in CO&lt
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    concentration in the gasifier increases heating value of product syngas.

    DOI: 10.1007/s40095-015-0173-1

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  • Dynamic study of steam generation from low-grade waste heat in a zeolite-water adsorption heat pump Reviewed

    Bing Xue, Xiangrui Meng, Xinli Wei, Koichi Nakaso, Jun Fukai

    APPLIED THERMAL ENGINEERING   88   451 - 458   2015.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    A novel zeolite water adsorption heat pump system based on a direct-contact heat exchange method to generate steam from low-grade waste gas and water has been proposed and examined experimentally. Superheated steam (200 degrees C, 0.1 MPa) is generated from hot water (70-80 degrees C) and dry air (100-130 degrees C). A dynamic model for steam generation process is developed to describe local mass and heat transfer. This model features a three-phase calculation and a moving water gas interface. The calculations are carried out in the zeolite water and zeolite gas regions. Model outputs are compared with experimental results for validation. The thermal response inside the reactor and mass of steam generated is well predicted. Numerical results show that preheat process with low-temperature steam is an effective method to achieve local equilibrium quickly, thus generation process is enhanced by prolonging the time and increasing mass of the generated steam. Besides, high-pressure steam generation up to 0.5 MPa is possible from the validated dynamic model. Future work could be emphasized on enhancing high-pressure steam generation with preheat process or mass recovery operation. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.applthermaleng.2014.11.050

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  • Convection heat transfer in a shell-and-tube heat exchanger using sheet fins for effective utilization of energy Reviewed

    Koichi Nakaso, Hiroki Mitani, Jun Fukai

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   82   581 - 587   2015.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Convection heat transfer in a shell-and-tube heat exchanger using sheet fins is numerically investigated. Heat and mass transfers in the heat exchanger are modeled under steady state to estimate the heat transfer rate and the pressure drop for various geometries of the heat exchanger. Based on the numerical results, the Nusselt number and pressure drop are formulated for practical applications. For convenience, similar expressions to those of conventional shell-and-tube heat exchangers, that is, the functions of dimensionless numbers such as the Reynolds number, are derived. In these equations, the geometry of the heat exchanger, fin efficiency, and contact thermal resistance are included as major factors. On formulating the equation for the overall heat transfer rate, it is found that the heat transfer coefficient for the heat exchanger with a fin does not correspond to the combination of the heat transfer coefficient of bare tube surface and the fin. This is because the heat exchange area is substantially limited especially at the narrow space between the tube and the fin. A correction factor for the substantial heat transfer area is therefore introduced. These formulated equations are helpful for installing sheet fins in manufactured heat exchangers. Using the formulated equations, effective conditions to enhance heat transfer rate by the fin are established, taking into account the increase in pressure drop. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2014.11.033

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  • Performance of a Novel Steam Generation System Using a Water-zeolite Pair for Effective Use of Waste Heat From the Iron and Steel Making Process Reviewed

    Koichi Nakaso, Yuuki Tanaka, Shotaro Eshima, Shunsuke Kobayashi, Jun Fukai

    ISIJ INTERNATIONAL   55 ( 2 )   448 - 456   2015

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    To reduce CO2 emission from the iron and steel making process, a novel steam generation system using waste hot water is proposed to use waste heat effectively from the process. This system adopts a direct heat exchange method for the adsorption heat pump to increase the heat transfer rate between the adsorbent and heat transfer fluid. In this study, the performance of the system is evaluated according to the mass of steam generated during the cyclic operation. The regeneration process is first studied taking the transport phenomena in the generator into account. The mass of steam generated is then estimated based on the distributions of water content and temperature in the generator. The results from the model exhibit good agreement with the experimental results. The effect of the operating conditions on the performance of the steam generation process is studied. It was found that there was an appropriate regeneration time to maximize the mass of steam generated during the cycle. For the effective use of adsorption heat, reuse of the water drained from the steam generation process (Drainage Recycling) is proposed. As a result, recycling the drainage water is a practical and helpful method to improve the performance of the system.

    DOI: 10.2355/isijinternational.55.448

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  • Combustibility of biochar injected into the raceway of a blast furnace Reviewed

    Agung Tri Wijayanta, Md. Saiful Alam, Koichi Nakaso, Jun Fukai, Kazuya Kunitomo, Masakata Shimizu

    FUEL PROCESSING TECHNOLOGY   117   53 - 59   2014.1

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    The combustibility of Taiheiyo coal and oak char in the tuyere and raceway of an ironmaking blast furnace was simulated. The effects of injection rate, O-2 concentration and particle diameter on combustibility were studied. Numerical results showed that increasing the O-2 concentration from 23 to 27 wt.% resulted in higher combustibility of both solid fuels. However, this effect was insufficient to increase the combustibility of oak char at high injection rates because its volatile content was lower than that of Taiheiyo coal. Temperature and reaction fields were sensitive to both combustion heat and volatile content. A longer raceway or smaller particle size was required to obtain the same combustibility of biochar as of the reference coal. If Taiheiyo coal with a particle diameter of 70 mu m was used at a high injection rate of 200 [(kg solid fuel)/(1000 Nm(3) feed gas)] with hot blasts containing 27 wt.% O-2, the particle diameter of oak char was required to be 60 mu m to obtain the same combustibility. These predictions reveal the potential of pulverized biochar injection instead of conventional pulverized coal injection in blast furnace ironmaking. (C) 2013 Elsevier B.V. All rights reserved.

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  • Numerical Study on Pulverized Biochar Injection in Blast Furnace Reviewed

    Agung Tri Wijayanta, Md. Saiful Alam, Koichi Nakaso, Jun Fukai, Kazuya Kunitomo, Masakata Shimizu

    ISIJ INTERNATIONAL   54 ( 7 )   1521 - 1529   2014

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    The possibility of injecting pulverized biochar instead of conventional pulverized coal in blast furnace ironmaking was investigated numerically. More detailed reactions including the water-related reactions were considered here. The combustion process from the tuyere to the raceway of a blast furnace was simulated. Oak char (volatile matter wt.% dry basis, VM = 27.11 wt.%-db) provided a lower temperature than Taiheiyo coal (VM = 44.60 wt.%-db). Increasing the O-2 concentration from 23 to 27 wt.% resulted in a higher combustibility of both solid fuels. However, the effect of increasing oxygen cOncentration was still insufficient for the Oak char at high injection rates because of its inadequate volatile content. Biochar properties become increasingly important as the injection rate increases. Compared with Oak char that provided a combustibility of 68% at an injection rate of 200 [(kg solid fuel)/(1 000 Nm(3) feed gas)] and hot blast of 27 wt.% O-2 concentration, Oak char 1 (VM = 32.09 wt.%-db) had a higher combustibility of 71%.

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  • Numerical investigation of cooling characteristics for fine mist cooling of high temperature material Reviewed

    Tsuyoshi Yamamoto, Takuya Kuwahara, Kakeru Yoshino, Koichi Nakaso, Takahisa Yamamoto

    Computational Thermal Sciences   6 ( 1 )   69 - 78   2014

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    Mist cooling is a technology to cool high temperature surfaces using an evaporative latent heat associated with the vaporization of atomized droplets. It has higher cooling capacity than the conventional cooling techniques such as forced convection, as it takes advantage of relatively large values of evaporative latent heat. In this paper, fine mist cooling as a high heat removal technology has been applied to the cooling of a high temperature work material. A threedimensional numerical simulation has been developed in order to investigate the behavior of fine mist particles, flow of gas phase and temperature of work material. Model predictions show that water droplets hardly evaporate in the gas phase of the analytical domain
    approximately 45% of fine mist particles flow out of the analytical domain and approximately 55% of fine mist particles collide on the work material. 10%-20% of collided water droplets evaporate on the work material and 80%-90% of collided water droplets stay on the work material under steadystate condition. Collision of fine mist particles on the work material has a high frequency in the central part of the device and the collision frequency of fine mist particles decreases with an increasing distance from the center of the work material. As a result, the surface temperature of the work material is comparatively low in the central part of the work material due to the evaporative latent heat of fine mist particles and becomes higher toward the outside of the work material. © 2014 by Begell House, Inc.

    DOI: 10.1615/ComputThermalScien.2014005831

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  • Development of Absorption Steam Generator without the Fossil Fuels Consumption Reviewed

    T. Nakagawa, T. Nishi, Y. Notoji, Y. Kawakami, M. Tanino, Y. Abe, K. Ito, K. Marumo, T. Aoyama, Y. Itaya, K. Nakaso, J. Fukai

    Journal of Energy and Power Engineering   8 ( 4 )   589 - 595   2014

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  • Cyclic steam generation from a novel zeolite-water adsorption heat pump using low-grade waste heat Reviewed

    Bing Xue, Yoshiho Iwama, Yuuki Tanaka, Kazuya Nakashima, Agung T. Wijayanta, Koichi Nakaso, Jun Fukai

    EXPERIMENTAL THERMAL AND FLUID SCIENCE   46   54 - 63   2013.4

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    Cyclic steam generation experiments from a novel zeolite-water adsorption heat pump were carried out to demonstrate the feasibility of recycling hot water and low-grade waste gas. A direct heat exchange approach was introduced to enhance heat transfer and decrease system size. The experimental steam generation rate per unit mass of zeolite is 2.44 x 10(-5) (kg-steam/kg-zeolite)/s at regeneration for 1200 s, which is 10% larger than that for 3600 s. A one-dimensional model describing transport phenomena during regeneration was developed to estimate temperature distributions and local water content in zeolite at the end of regeneration. Based on the numerical results, the mass of steam generated in the subsequent process was calculated. Then, the cyclic steam generation rate can be estimated. Calculated results on steam generation rate agree with the two sets of experimental data. The calculation reveals a maximum in the steam generation rate with the change in regeneration time. Predictions also show the possibility of high-pressure steam generation from this system. (c) 2012 Elsevier Inc. All rights reserved.

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  • Effect of Solute- and Solvent-Derived Marangoni Flows on the Shape of Polymer Films Formed from Drying Droplets Reviewed

    Patience Oluwatosin Babatunde, Wang Jing Hong, Koichi Nakaso, Jun Fukai

    AIChE Journal   59 ( 3 )   699 - 702   2013.3

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    Significance: The effects of mixed solvents on the shape of films formed on a hydrophilic surface from polymer solute droplets were investigated experimentally. The film shape depended on the two solvents used, and the mixing ratio. It was also found that the flow direction was dominated by solute-derived rather than solvent-derived Marangoni flows. Consequently, the changes in the shape of the film could not be explained only by the Marangoni flow direction. © 2013 American Institute of Chemical Engineers.

    DOI: 10.1002/aic.14031

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  • Collection properties of PM in a fluidized bed-type PM-removal device Reviewed

    Tsuyoshi Yamamoto, Kenta Hori, Koichi Nakaso, Takahisa Yamamoto, June Tatebayashi

    Kagaku Kogaku Ronbunshu   39 ( 1 )   60 - 66   2013

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    A fluidized bed was applied in a PM-removal device to remove PM2.5 effectively by the adhesion force. The effect of PM diameter on PM collection characteristics in the device was investigated experimentally. Numerical simulation was also performed to analyze the adhesion behavior of PM on the surface of particle in the fluidized bed and to compare the results with the experimental data. The experimental results show that the dominant factor of PM flow (except for flow resistance) changes from gravity to the adhesion force with decreasing PM diameter between 8.95 μm and 2.25 μm. When PM diameter is less than 2.25 μm, PM is effectively collected by the adhesion force. Model predictions are in reasonably good agreement with the experimental observations. Model predictions indicate that PM is mainly collected in the area with a higher volume fraction of bed particles and is rarely collected in bubbles in the fluidized bed. © 2013 The Society of Chemical Engineers, Japan.

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  • Potential of a direct contact adsorption heat pump system for generating steam from waste water Reviewed

    Erfina Oktariani, Atsushi Noda, Kazuya Nakashima, Keisuke Tahara, Bing Xue, Koichi Nakaso, Jun Fukai

    INTERNATIONAL JOURNAL OF ENERGY RESEARCH   36 ( 11 )   1077 - 1087   2012.9

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    An adsorption heat pump with a direct contact system for steam generation has been developed and the feasibility of the proposed system was confirmed both theoretically and experimentally. The basic cycle for the system has been proposed to use zeolitewater working pairs in the p-T-x equilibrium curve. To generate steam above 150 degrees C from low-energy level water at 80 degrees C, a direct contact adsorption heat pump prototype was constructed. The experimental results show that steam could be generated by the direct contact system and the relationship between the amount of water adsorbed and the change in temperature with time is discussed. This study is expected to serve as a foundation for developing continuous adsorption heat pump systems for steam generation. Copyright (c) 2011 John Wiley & Sons, Ltd.

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  • Optimized combustion of biomass volatiles by varying O-2 and CO2 levels: A numerical simulation using a highly detailed soot formation reaction mechanism Reviewed

    Agung Tri Wijayanta, Md. Saiful Alam, Koichi Nakaso, Jun Fukai, Masakata Shimizu

    BIORESOURCE TECHNOLOGY   110   645 - 651   2012.4

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    To increase syngas production and minimize soot, polycyclic aromatic hydrocarbon (PAH), and CO2 emissions resulting from biomass combustion, the evolution of biomass volatiles during O-2/CO2 gasification was simulated. A highly detailed soot formation reaction mechanism flowing through the reactor, involving 276 species, 2158 conventional gas phase reactions and 1635 surface phase reactions, was modeled as a plug flow reactor (PFR). The reaction temperature and pressure were varied in the range 1073-1873 K and 0.1-2 MPa. The effect of temperature on product concentration was more emphasized than that of pressure. The effect of O-2/CO2 input on product concentration was investigated. O-2 concentration was important in reducing PAHs at low temperature. Below 1473 K, an increase in the O-2 concentration decreased PAH and soot production. However, if the target of CO2 concentration was higher than 0.22 in mass fraction terms, temperatures above 1473 K reduced PAHs and increased CO. (C) 2012 Elsevier Ltd. All rights reserved.

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  • Kinetic study of fuel NO formation from pyrrole type nitrogen Reviewed

    Tsuyoshi Yamamoto, Takuya Kuwahara, Koichi Nakaso, Takahisa Yamamoto

    FUEL   93 ( 1 )   213 - 220   2012.3

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    An experimental study using a flow reactor and a numerical simulation with a detailed kinetic model have been performed to investigate the reaction mechanism of NO formation from pyrrole decomposition. The experiments have been conducted in a quartz flow reactor by using a mixture gas of pyrrole, O-2 and H2O with N-2 as a balance gas at atmospheric pressure and temperature range 800-1400 K. The detailed kinetic model consists of 505 elementary reactions and 89 chemical species, and the plug flow calculations have been carried out under same conditions as experiments. Model predictions are in reasonably good agreement with the experimental data for NO formation from pyrrole. Model predictions indicate that the main reaction pathways from pyrrole to HCN are direct reaction by pyrrole pyrolysis and pyrolysis reaction of HNCPROP (HN=CHACH=C=CH2) generated by ring scission reaction of pyrrole. HCN is converted to N-2 or NO via NCO and about 90% of nitrogen in pyrrole is transformed to N-2 or NO at the temperature of above 1400 K. The residence time has little influence on the reaction rate and the reaction rate largely depends on the reaction temperature. (C) 2011 Elsevier Ltd. All rights reserved.

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  • Numerical investigation on combustion of coal volatiles under various O-2/CO2 mixtures using a detailed mechanism with soot formation Reviewed

    Agung Tri Wijayanta, Md. Saiful Alam, Koichi Nakaso, Jun Fukai

    FUEL   93 ( 1 )   670 - 676   2012.3

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    The effort for increasing syngas production and reducing soot and CO2 emissions from coal combustion is important for cleaner and more efficient use of coal for energy production. The primary reactions of coal volatiles for soot formation mechanism were numerically investigated under pyrolysis (thermal decomposition), partial oxidation (O-2 gasification) and O-2/CO2 gasification conditions. Soot formation was modeled in a plug flow reactor (PFR) with a detailed reaction mechanism containing 276 species, 2158 conventional gas phase reactions and 1635 surface phase reactions. The reaction temperature and pressure were maintained in the range 1273-1873 K and 0.1-2 MPa, respectively. The effect of temperature on product concentrations appeared more significant compared with pressure effect. In the viewpoint of special attention regarding O-2/CO2 blown gasification, the effect of O-2/CO2 input on the production of major combustion species was investigated. The O-2 input became important in reducing PAHs/soot at low temperature. However, if the gas mixture input had a high CO2 concentration, higher temperature and pressure provided in eliminated PAHs/soot and increased CO. (C) 2011 Elsevier Ltd. All rights reserved.

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  • Marangoni Flows in Polymer Solution Droplets Drying on Heating Surfaces Reviewed

    Shohei Yasumatsu, Kouichi Nakaso, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   45 ( 2 )   128 - 135   2012

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    The effect on substrate temperature on the fluid dynamics in a polymer solution droplet evaporating on a substrate is investigated experimentally and numerically. It is found from the experiments that fluid velocities in the droplets increase with increasing initial substrate temperature and with decreasing initial solute concentration. A mathematical model, which takes thermal and solutal Marangoni effects into account, are numerically solved using a finite element method. The calculated fluid velocities agree with the experiment. Both experiments and calculations show that, though thermal Marangoni forces dominate the fluid dynamics, solute Marangoni forces should never be neglected. The calculations predict that solute Marangoni effects are more emphasized with decreasing contact angle.

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  • Syngas Production from Coal Gasification with CO2 Rich Gas Mixtures Reviewed

    M. S. Alam, A. T. Wijayanta, K. Nakaso, J. Fukai

    CLEANER COMBUSTION AND SUSTAINABLE WORLD   726 - 729   2012

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    Coal gasification with CO2 rich gas mixture is one of several promising new technologies associated with CO2 reduction in the atmosphere. Coal gasification with high CO2 concentration is suitable for producing large amount of syngas. However, an increase in CO2 concentration will result in lower gas temperature in the reactor. In this paper, a similar gas temperature profile in CO2/O-2 mixtures to that of coal gasification in air is predicted by observing the effects of CO2 concentration. The coal gasification model considered in this calculation is composed of devolatilization model, char gasification model and gas phase reaction model. Reaction rate equation of n-th order type with the Random Pore Model is applied to the char gasification reaction. Influence of inlet particles size is also studied. It is found that 20 mu m particles in 21%O-2/79%CO2 and 100 mu m particles in air (21%O-2/79%N-2) result in a similar gas temperature profile during coal gasification. The outlet gas mixture with the same calorific value as from air blown coal gasification can be obtained if air is replaced by 50%CO2/29%N-2/21%O-2 mixtures

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  • ESTIMATION OF PERFORMANCE OF ABSORPTION/DESORPTION SYSTEM FOR REGENERATING WASTE WATER FROM INDUSTRIAL PROCESS Reviewed

    Koichi Nakaso, Erfina Oktariani, Atsushi Noda, Kazuya Nakashima, Keisuke Tahara, Bing Xue, Agung Tri Wijayanta, Jun Fukai

    PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY 2011, PTS A-C   1043 - 1049   2012

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    More reduction in energy consumption is requested to the industrial processes. In particular, large quantity of waste water at low temperature is released from chemical and steel processes. In this study, adsorption/desorption process of zeolite and water pair were selected to generate steam from water at low temperature. Contacting water liquid and zeolite directly, adsorption heat released from zeolite makes excess water evaporate. Basic experiments for adsorption/desorption process were carried out. First of all, adsorbents with different type were tested to find the candidate of the proposed system, and then suitable adsorbent was selected. From the basic adsorption experiment, generation of steam from the water liquid was confirmed by the proposed system. In the desorption process, hot dry gas was introduced to the adsorbent. The effect of gas temperature and its flow rate was investigated. The performance of the system was theoretically investigated based on overall heat and mass balances. As a result, the ratio of enthalpy of recovered steam of 140 degrees C to input waste water of 80 degrees C was around 6 when adsorption process was only considered. On the other hand, the ratio was 0.57 when waste heat was utilized for the desorption process. However if waste heat such as exhaust gas can be utilized for the desorption process, the ratio, that is, the efficiency would increase.

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  • Numerical Investigation of Syngas Production from Coal Gasification under Various CO2/O2 Mixtures Reviewed

    A. Md. Saiful, A. T. Wijayanta, K. Nakaso, J. Fukai

    Canadian J. Computing in Mathematics, Natural Sciences, Engineering and Medicine   3 ( 4 )   88 - 97   2012

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  • Factors Dominating Polymer Film Morphology Formed from Droplets Using Mixed Solvents Reviewed

    Patience Oluwatosin Babatunde, Narumi Nanri, Kenji Onitsuka, Koichi Nakaso, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   45 ( 8 )   622 - 629   2012

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    The effects of mixed solvent on polymer film morphologies formed from droplets of solution dried on a substrate with circular hydrophilic surfaces patterned on a hydrophobic surface were investigated. Several solvent mixtures were used, with polystyrene as a solute at various concentrations. Droplets formed a thin film after shrinking on the hydrophobic surface to the boundary between the two surfaces. The results from the chosen binary solvent pair combination showed that ring films tend to shift to flat films at each mixing ratio as the initial solute concentration increases. Marangoni flow arising from the concentration profiles of the solvents and solute was discussed. However, no evidence was found for Marangoni effects changing the experimental film morphologies when considering the effect of solute. Instead, the viscosity and contact angle at self-pinning was found to affect film morphology.

    DOI: 10.1252/jcej.12we085

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  • Numerical Simulation for Steam Generation Process in a Novel Zeolite-Water Adsorption Heat Pump Reviewed

    Bing Xue, Keisuke Tahara, Kazuya Nakashima, Atsushi Noda, Erfina Oktariani, Agung Tri Wijayanta, Koichi Nakaso, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   45 ( 6 )   408 - 416   2012

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    A mathematical model has been developed to predict mass and heat transfer during the steam generation process in a novel zeolite-water adsorption heat pump system. This model features a three-phase calculation and a moving water-gas interface. The calculations were carried out in the zeolite-water and zeolite-gas regions. An enthalpy form is adopted to account for water evaporation. Model outputs are compared with experimental results for validation. The thermal response in the reactor is well simulated with a relative error between the calculated and experimental steam mass of 0.6% to 1.9%. The effects of operational temperatures on the steam mass are also investigated numerically. Raising the water temperature rather than zeolite temperature enhances the mass of steam produced. The peak temperature in the reactor increases from 300 to 311 degrees C as initial zeolite temperature rises from 80 to 120 degrees C.

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  • Experimental Investigation on the Adsorption Process for Steam Generation Using a Zeolite-Water System Reviewed

    Erfina Oktariani, Keisuke Tahara, Kazuya Nakashima, Atsushi Noda, Bing Xue, Agung Tri Wijayanta, Koichi Nakaso, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   45 ( 5 )   355 - 362   2012

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    A direct heat exchange system using zeolite 13X-water working pairs is expected as an effective process to generate steam more than 150 degrees C from water below 100 degrees C. As a basic study, steam at 100 degrees C from water at 80 degrees C was investigated. The effects of the direction of feeding water in the adsorption process were experimentally investigated. The experimental results for the feeding from the bottom show that mass of generated steam reached almost 90% of the theoretical value obtained by heat mass balances. However, the performance, that is, the mass ratio of generated steam to the inlet water was around 6.5% because an abundance of water should be introduced to get contact between zeolite particle and water. Feeding water from the top was, therefore, investigated to increase the performance of steam generation with various nozzle configurations. Although the mass of the product steam was less than that for feeding water from the bottom, the mass ratio was improved to 13% by using 14 nozzles. This is because the nozzle installation enlarged the contact area between water and zeolite with a small amount of water.

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  • Self-Organization of Polymer Films Using Single and Mixed Solvents on Chemically Patterned Surfaces Reviewed

    Shohei Yasumatsu, Hirotaka Ishizuka, Koichi Nakaso, Patience Oluwatosin Babatunde, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   45 ( 4 )   265 - 271   2012

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    The breakup processes of polymer solution droplets deposited on chemically strip-patterned surfaces are investigated experimentally. Polystyrene is used as solute while various liquids are used as solvents. Breakup of the liquid film is found to progress by iterations of self-pinning on lyophilic channels and receding of the contact line on lyophobic channels. Accordingly, formation of the polymer thin film is incomplete when the contact lines are not pinned on the lyophilic channels, or when they are pinned on the lyophobic channels. To induce a Marangoni effect on breakup, binary solvent mixtures are used. For several mixtures, thin liquid films are elongated on the lyophilic channels, enhancing breakup. Such mixtures exhibit complete wetting on homogeneous lyophilic surfaces as a result of the Marangoni effect.

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  • Effect of pressure, composition and temperature characteristics on thermal response and overall reaction rates in a metal hydride tank Reviewed

    Agung Tri Wijayanta, Koichi Nakaso, Takuro Aoki, Yusuke Kitazato, Jun Fukai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   36 ( 5 )   3529 - 3536   2011.3

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    The effects of pressure, composition and temperature (PCT) characteristics on the thermal response and overall reaction rates in a packed bed reactor of metal hydrides have been investigated at both constant and variable hydrogen pressures. LaNi(5) particles were used as the alloys for metal hydride formation inside a 50 mm i.d. x 185 mm height cylindrical reactor. Predictions of the thermal response and overall reaction rates were also carried out using three distinct models for the PCT characteristics: one based on Van't Hoff's equation [refer to Mayer et al. J Less Common Met 1987; 131: 235-44], another developed by [Jemni and Nasrallah. Int J Hydrogen Energy 1995; 20: 43-52, 881-891] and a new model and compared with the experimental results. The transient local bed temperature and reaction rate obtained from the predictions strongly depend on the model chosen for the PCT characteristics. Our new model provides good agreement with experiments. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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  • 低温排熱有効活用のための水蒸気回生ヒートポンプシステムの開発-基本概念と省エネルギー効果の予測- Reviewed

    中曽 浩一, E. Oktariani, 野田 敦嗣, 板谷 義紀, 中川 二彦, 深井 潤

    エネルギー・資源学会論文誌   32 ( 5 )   9 - 16   2011

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  • Thermal Fluid Analysis of the Fine Mist for Cooling of High Temperature Material Reviewed

    Tsuyoshi Yamamoto, Takuya Kuwahara, Koichi Nakaso, Takahisa Yamamoto

    KAGAKU KOGAKU RONBUNSHU   37 ( 3 )   277 - 283   2011

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    Heat transfer techniques involving phase a change process are likely to play an important role in industrial devices that require the ability to remove high heat quickly. In the present work, fine mist cooling as a high heat removal technology was applied to the cooling of high temperature work material. A three-dimensional numerical simulation was developed to investigate the behavior of water particles and temperature of work material. The calculated results were in reasonably good agreement with experimental results for cooling performance of fine mist. It was found that about 50% of mist particles collide with the work material, and 20-30% of these particles evaporate after collision.

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  • Structure of Circulation Flows in Polymer Solution Droplets Receding on Flat Surfaces Reviewed

    Yu Yoshitake, Shohei Yasumatsu, Masayuki Kaneda, Koichi Nakaso, Jun Fukai

    LANGMUIR   26 ( 6 )   3923 - 3928   2010.3

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    In a previous report where internal flows were experimentally visualized in polymer solution droplets receding on a lyophobic surface [Kaneda et al., Langmuir 2008, 24, 9102-9109], the direction of the circulation flow was found to depend oil solvent and solute concentration. To identify the reason for this finding, the internal now in the droplet is investigated numerically. A mathematical model predicts that double circulation flows initiate after a single now develops at high Marangoni numbers, while only a single circulation flow develops at low Marangoni numbers. The dependencies of the calculated velocities on the solvent and the initial solute concentration agree qualitatively with experiment. It is Concluded that the difference of the flow directions that were investigated experimentally is due to such a change in the now structures. The effects of the contact angle and dimensions on transport phenomena in a droplet are also discussed.

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  • EFFECTS OF FIN CONFIGURATION ON HEAT TRANSFER RATE IN PACKED BED REACTORS FOR IMPROVEMENT OF THEIR THERMAL CHARACTERISTICS Reviewed

    Koichi Nakaso, Takuro Aoki, Jun Fukai

    PROCEEDINGS OF THE ASME INTERNATIONAL HEAT TRANSFER CONFERENCE - 2010, VOL 6   975 - 981   2010

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    Packed bed reactors are utilized for catalysts, chemical heat pumps, etc. Because the effective thermal conductivities of the packed beds of particles are generally low (approximate to 10(-1) W/mK), this matter often results in low performance and degradation of catalyst. Many heat transfer tubes with fins and/or much filler with high thermal conductivities are inserted in the packed bed reactors to improve heat transfer rate. In return to this, the volume of reactive particles packed into the reactors, or stored energy, decreases.
    In this study, the effect of fin configurations on the heat transfer rate in the reactors is numerically investigated. Three. configurations of fins are studied. (I) "Sheet type" is a longitudinal fin attached on the heat transfer tubes. It is placed to connect between heat transfer tubes. (2) "Straight type" is several longitudinal fins in the half length of the tube pitch attached on the tube with radial structure. (3) "Spiral type" is many narrow rectangular fins attached on the tube with spiral structure.
    To discuss the effect of fin configuration on the heat transfer generally, the heat conduction equation in the packed bed around the tube is converted to the dimensionless form. The transient temperature responses in the packed bed and fins at a uniform temperature are calculated when the temperature of the tube surface is stepwise changes. In another analytical system, a homogeneous body around the tube is assumed. To evaluate the thermal performance of the fin, apparent thermal conductivity is defined as the thermal conductivity which gives the same thermal response as that calculated in the heterogeneous system. As a result, the spiral type rather than the straight and sheet types effectively increases apparent thermal conductivity. The apparent thermal conductivity of the spiral type is two-three times larger than the straight type, and ten times as large as the sheet type. This result indicates dispersion of fins in packed bed is essential to improve the thermal response in the reactors.

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  • INTERNAL FLOWS IN MICROSCOPIC POLYMER SOLUTION DROPLETS EVAPORATING ON FLAT SURFACES Reviewed

    Shohei Yasumatsu, Narumi Nanri, Yu Yoshitake, Koichi Nakaso, Jun Fukai

    PROCEEDINGS OF THE ASME INTERNATIONAL HEAT TRANSFER CONFERENCE - 2010 , VOL 3   861 - 869   2010

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    To control the formation process of polymer thin films from polymer solution droplets using inkjet printings, internal flows of the droplets on substrates are studied. In our previous study [1], internal flow of polymer solution droplets receding on a lyophobic surface was experimentally visualized. It was found that the direction of the circulation flow in the droplet depended on the solvent and the initial solute concentration. In particular, the flow direction of polystyrene-anisole solution was reversed as the initial solute concentration increased. In this study, to clarify this reason, the conservation equations of momentum, energy and mass on two-dimensional cylindrical coordinate are numerically solved using a finite element method. The mathematical model considers the free convections derived by the dependencies of the density and surface tension on the solute concentration.
    As a result, the dependences of the calculated velocities on the initial solute concentration agree qualitatively with the experiments. The mathematical model predicts that double circulation flows appear after a single flow develops at high initial solute concentrations, while double circulations do not develop at low concentrations. It is concluded that the difference between the flow directions investigated experimentally is due to such a change of the flow structure.
    The distribution of the surface tension on the free surface is also discussed. When a local minimum of the surface tension appears on the free surface, the double circulations develop. According to the result for a low contact angle; the local minimum point shifts toward the axis of symmetry with a lapse of time, and finally erases the double circulations.

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  • A reduced mechanism for primary reactions of coal volatiles in a plug flow reactor Reviewed

    Md. Saiful Alam, Agung Tri Wijayanta, Koichi Nakaso, Jun Fukai, Koyo Norinaga, Jun-ichiro Hayashi

    COMBUSTION THEORY AND MODELLING   14 ( 6 )   841 - 853   2010

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    In the present paper, the authors study the primary reactions of coal volatiles and a detailed mechanism has been made for three different environments: thermal decomposition (pyrolysis), partial oxidation (O2) and O2/CO2 gasification in a plug flow reactor to analyze the combustion component. The computed results have similar trend for three different environments with the experimental data. A systematically reduced mechanism for O2/CO2 gasification has also been derived by examination of Rate of Production (ROP) analysis from the detailed mechanism (255 species and 1095 reactions). The reduced mechanism shows similar result and has been validated by comparing the calculated concentrations of H2, CH4, H2O, CO, CO2 and polycyclic aromatic hydrocarbon (PAH) with those of the detailed mechanism in a wide range of operating conditions. The authors also predicted the concentration profiles of H2, CO, CO2 and PAH at high temperature and high pressure.

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  • 基板上で蒸発する溶液滴内の溶質濃度差対流の構造

    南里 功美, 安松 祥平, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2010   666 - 666   2010

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    DOI: 10.11491/scej.2010f.0.666.0

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  • 高温蒸気生成のための直接熱交換式吸着ヒートポンプ

    野田 敦嗣, Erfina Oktariani, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2010   84 - 84   2010

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    DOI: 10.11491/scej.2010f.0.84.0

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  • 基板上で蒸発する溶液滴内部流動に及ぼす気相内熱物質拡散の影響

    安松 祥平, 南里 功美, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2010   397 - 397   2010

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    DOI: 10.11491/scej.2010f.0.397.0

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  • Heat Transfer Enhancement in a Packed Bed Reactor Using Spiral Carbon Fibers on the Heat Transfer Tube Reviewed

    Koichi Nakaso, Heunku Kang, Takuro Aoki, Jun Fukai

    KAGAKU KOGAKU RONBUNSHU   35 ( 5 )   511 - 516   2009.9

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    Heat transfer enhancement in a packed bed reactor equipped with a heat transfer tube was studied. Bundles of carbon fibers of high thermal conductivity were attached to the heat transfer tube not only to increase the effective thermal conductivity around the tube but also to improve the contact thermal resistance between the fibers and the tube. To disperse the carbon fibers in the reactor effectively, a spiral configuration was employed. The effect of the method of fixing the carbon fibers on the heat transfer rate was investigated, and a silver paste adhesive rather than an aluminum tape was found to be suitable to fix the fibers and to transfer thermal energy effectively. The spiral carbon fibers effectively improve thermal responses of the reactor because of their lower contact thermal resistance than a carbon fiber brush.

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  • 粒子充填層内の伝熱速度に及ぼすカーボンナノチューブの影響 Reviewed

    中曽 浩一, 青木 拓朗, 多田 知存, 深井 潤

    粉体工学会誌   46   162 - 168   2009

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  • チューブ式熱交換器における交換可能な伝熱促進フィンの研究 Reviewed

    田中 啓之, 中曽 浩一, 古本 直行, 中川 二彦, 深井 潤

    日本機械学会論文集(B編)   75 ( 757 )   1854 - 1861   2009

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    To conventionaly extend heat transfer area in shell-and-tube heat exchangers, a method is proposed where sheet materials with high thermal conductivities are stretched among tubes. The numerical simulations are carried out to predict the performance of heat exchanger with or without the sheets. As a result, it is found that thermal contact resistances between the sheet and tubes rather than thickness and thermal conductivity of the sheet influence overall heat transfer coefficient. In the experiments, the carbon fibers clothes (27Wm^<-1>K^<-1>) are pass zigzag though the tubes whose pitch is 20mm. The heat transfer rate between hot water flowing in the tube side and air in the shell side are measured. No substantial improvement of heat transfer is unfortunately observed experimentally due to contact thermal resistance. The method proposed in this study conclusively has a potential that the heat transfer rate improves no less than a few ten percents.

    DOI: 10.1299/kikaib.75.757_1854

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  • PIVによる2成分溶媒溶液滴の内部流動可視化

    宮本 晋安, 中曽 浩一, 金田 昌之, 深井 潤

    化学工学会 研究発表講演要旨集   2009   103 - 103   2009

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    DOI: 10.11491/scej.2009f.0.103.0

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  • 接触線後退過程における基板上高分子溶液滴の内部流動解析

    中曽 浩一, 吉竹 祐, 安松 祥平, 石橋 加奈子, 金田 昌之, 深井 潤

    化学工学会 研究発表講演要旨集   2009   553 - 553   2009

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    DOI: 10.11491/scej.2009f.0.553.0

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  • ライン状パターン表面における2成分溶媒滴を用いた薄膜形成

    安松 祥平, 宮本 晋安, 中曽 浩一, 金田 昌之, 深井 潤

    化学工学会 研究発表講演要旨集   2009   597 - 597   2009

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    DOI: 10.11491/scej.2009f.0.597.0

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  • スパイラル型矩形フィン付き伝熱管を設置した粒子充填層内の伝熱速度解析

    青木 拓朗, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2009   702 - 702   2009

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    DOI: 10.11491/scej.2009f.0.702.0

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  • スパイラル型炭素繊維を用いた伝熱管による粒子充填層内の伝熱促進

    カン ホング, 青木 拓朗, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2009   523 - 523   2009

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    DOI: 10.11491/scej.2009.0.523.0

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  • 基板上における高分子溶液滴の接触線固定に関する解析

    石橋 加奈子, 吉竹 祐, 金田 昌之, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2009   123 - 123   2009

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    DOI: 10.11491/scej.2009.0.123.0

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  • Extension of heat transfer area using carbon fiber cloths in latent heat thermal energy storage tanks Reviewed

    Koichi Nakaso, Hirofurni Teshima, Akito Yoshimura, Seiichi Nogarni, Yuichi Hamada, Jun Fukai

    CHEMICAL ENGINEERING AND PROCESSING   47 ( 5 )   879 - 885   2008.5

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    Carbon fiber cloths are stretched among heat transfer tubes to extend the heat transfer area in latent heat thermal energy storage tanks. The thermal responses of the tanks into which paraffin wax as the thermal energy storage material is packed are experimentally investigated. The experimental results show that the carbon fiber cloths of only 0.4 vol.% improve the heat exchange rate in the tanks. A numerical model describing the heat transfer in the tank well predicts the experimental results. Moreover, the effect of the carbon fiber cloths on the thermal performance for a practical scale tank is numerically discussed. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cep.2007.02.001

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  • 親液面上における2成分溶媒溶液滴内のマランゴニ対流と成膜

    宮本 晋安, 石橋 加奈子, 吉竹 祐, 高尾 裕, 金田 昌之, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2008   582 - 582   2008

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    DOI: 10.11491/scej.2008f.0.582.0

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  • 水素吸蔵合金粒子充填層内の伝熱速度解析

    青木 拓朗, 北里 優介, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2008   679 - 679   2008

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    DOI: 10.11491/scej.2008f.0.679.0

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  • Transport phenomena in a packed bad reactor of metal hydride and promotion of its reaction rates by heat transfer enhancement Reviewed

    Koichi Nakaso, Akito Yoshimura, Yusuke Kitazato, Ryosuke Shigenaga, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   40 ( 12 )   1056 - 1063   2007.12

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    Packed bed reactors using metal hydride are attracting a lot of attention as potential future hydrogen storage systems, actuators, etc. However, their low effective thermal conductivities lead to low performance. In this study, carbon fiber brush with high thermal conductivity was installed in a reactor to improve the effective thermal conductivity. We found that the carbon fiber brush at 1.0 vol% reduced the reaction time by 30%. A two-dimensional mathematical model describing the heat and mass transfer was developed to predict the thermal performance. Expansion of particles due to absorption is also considered in this model. The model was compared with the experimental results, and it predicted the time variations of the averaged reacted fraction and local reactor temperature very well. The model suggests that heat transfer rather than mass transfer controls the overall reaction.

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  • Oscillation of a tilted circular pad on a droplet for the self-alignment process Reviewed

    Masayuki Kaneda, Michinori Yamamoto, Koichi Nakaso, Tsuyoshi Yamamoto, Jun Fukai

    PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY   31 ( 2 )   177 - 184   2007.4

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    The seesaw-oscillation of a small circular pad on a single droplet was studied both numerically and experimentally. The circular pad with a diameter of 2.0-3.8 mm onto a water or glycerol droplet with a volume of 1-10 mu L, and a bottom substrate with a smaller diameter than that of the pad were used in the experiment. The pad was then tilted and then the tilting fixture was quickly removed. The pad alternately oscillated and then finally stabilized in a horizontal position. The numerical model considering the surface tension and the viscous force of the droplet was developed and calculated using the same configurations as those in the experiment. The experimental and numerical data showed good agreement not only in terms of the oscillating frequency and damping ratio but the transient motion of the circular pad and instantaneous droplet surface shape. (c) 2006 Elsevier Inc. All rights reserved.

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  • Effect of Heat Transfer Enhancement on Energy Release Rate from a Metal Hydride Tank Reviewed

    Koichi Nakaso, Ryosuke Shigenaga, Jun Fukai

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   40 ( 13 )   1257 - 1263   2007

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    Metal hydride (MH) attracts considerable attention for not only hydrogen storage devices hut also chemical heat pumps (CHPs). Many previous researchers pointed out low effective thermal conductivity of MH packed bed resulted in low performance. Indeed, several attempts have been done to improve it. However, no guideline for improving the thermal performance with heat transfer enhancement has been discussed. In this study, thermal performance for a packed bed reactor of MH is numerically investigated. Diagrams for the heat transfer enhancement are developed according to the numerical results. The previous strategies to improve effective thermal conductivity can be combined with the diagrams for the practical use.

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  • CNTによる粒子充填層内有効熱伝導率の向上

    中曽 浩一, 多田 知存, 北里 優介, 重永 亮介, 深井 潤

    化学工学会 研究発表講演要旨集   2007   758 - 758   2007

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    DOI: 10.11491/scej.2007.0.758.0

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  • Performance of a latent thermal energy storage tank fitted with carbon-fiber cloths to expand the heat transfer area Reviewed

    Koichi Nakaso, Seiichi Nogami, Hirofumi Teshima, Yasutoshi Inatomi, Kunihiko Kitamura, Jun Fukai

    KAGAKU KOGAKU RONBUNSHU   32 ( 5 )   414 - 419   2006.9

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    Carbon-fiber cloths were installed in a latent heat thermal energy storage (LHTES) tank to expand the heat transfer area, and the characteristics of the energy charge and discharge processes were compared with the results for carbon-fiber brushes previously reported. In the charge process, carbon-fiber cloths with a volume of 0.27% of the tank volume exhibited better thermal performance than carbon-fiber brushes with a volume of 1.3%. In the discharge process, their thermal performances were the same. The thermal performance of the cloths was accordingly superior to the brushes. When the discharge characteristics were evaluated in terms of the overall fin efficiency, that of carbon-fiber cloths under the present conditions was twice as high as that without carbon fibers. An increase in volume fraction of carbon fibers resulted in higher efficiency, which reached 0.9 only at 1 vol.% of carbon fibers.

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  • 水素吸蔵反応に及ぼす伝熱促進の効果

    北里 優介, 重永 亮介, 吉村 昭人, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2006   145 - 145   2006

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    DOI: 10.11491/scej.2006f.0.145.0

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  • 炭素繊維クロスを利用した潜熱蓄熱槽の開発 Reviewed

    野上 精一, 中曽 浩一, 手島 博文, 稲富 康利, 北村 邦彦, 深井 潤

    空気調和・衛生工学会論文集   114 ( 114 )   11 - 18   2006

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    Latent thermal energy storage (LHTES) tanks where carbon-fiber cloths are used to extend the heat transfer area are developed. The tanks are set in an air-conditioning system in a building, and then the performances are evaluated using imitation and practical loads. The results are compared with those of the tanks where carbon fiber brushes are installed. As a result, the carbon cloths of 0.27vol%, exhibit the equivalent thermal performance to the carbon fiber brushes of 1.3vol% during the charge process. The thermal performance of the former is apparently superior to the latter. The effect of the orientation of the cloths in the tanks on the heat transfer rate is also investigated. However it has less influence on the charge and discharge characteristics of the tanks.

    DOI: 10.18948/shase.31.114_11

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  • 水素吸蔵合金粒子充填層内の輸送現象解析と熱出力向上の検討

    重永 亮介, 北里 優介, 吉村 昭人, 中曽 浩一, 深井 潤

    化学工学会 研究発表講演要旨集   2006   720 - 720   2006

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  • A new observation on the phase transformation of TiO2 nanoparticles produced by a CVD method Reviewed

    CS Kim, K Nakaso, B Xia, K Okuyama, M Shimada

    AEROSOL SCIENCE AND TECHNOLOGY   39 ( 2 )   104 - 112   2005.2

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    Titania (TiO2) nanoparticles with primary diameters of less than 30 nm were produced by the thermal decomposition of TTIP and by the oxidation of TiCl4 in a cylindrical furnace reactor at 1200degreesC. Particle size, crystalline phase, and phase transformation were investigated as a function of precursor concentration and total flow rate by TEM, a DMA/CNC system, XRD, and TG-DTA. The results show that both particle size and number concentration were increased with increasing precursor concentration, and that the primary size could be controlled by changing the operating conditions. An anatase-to-rutile phase transformation occurred at TTIP concentrations above 7.68 x 10(-6) mol/l and this was enhanced with increasing precursor concentration. It is noteworthy that the transformation is independent of grain size but appears to be related to the presence of carbon impurities in the nanoparticles.

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  • Direct measurement of nucleation and growth modes in titania nanoparticles generation by a CVD method Reviewed

    CS Kim, K Okuyama, K Nakaso, M Shimada

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   37 ( 11 )   1379 - 1389   2004.11

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    To understand the mechanism by which titania (TiO2) nanoparticles are generated by a CVD method, the primary nucleation mode size distributions of TiO2 nanoparticles prepared from two different chemical precursors (TTIP and TiCl4) were directly measured using a DMA/PSM/CNC system. This represents the first report of such direct measurement in the nucleation mode. These results are particularly important for experimental investigation of particle nucleation and growth, something which has never been achieved before. In the nucleation mode, titania nanoparticles with a diameter of about 2 nm were produced by nucleation. At low reactor temperatures, nucleation and surface reaction were major contributors to particle generation. At a high reaction temperature, coagulation and sintering became more important. The morphology and crystallinity of the particles were investigated by TEM and XRD as a function of temperature and precursor concentration. The properties of the titania nanoparticles, such as particle size distribution, the morphology and crystallinity, changed as a function of reaction temperature and chemical reaction rate.

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  • Simplified model for estimating performance of latent heat thermal energy storage of a shell-and-tube type unit Reviewed

    K Nakaso, S Nogami, N Takahashi, Y Hamada, J Fukai

    KAGAKU KOGAKU RONBUNSHU   30 ( 4 )   474 - 479   2004.7

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    The outlet fluid temperature of a latent heat thermal energy storage unit was numerically estimated using a simplified three-dimensional heat transfer model. In this model, thermal conductivity of liquid phase assumed to have a high value, while free convection heat transfer in the liquid phase is neglected. Comparison of calculated and experimental values showed that the simplified model was able to predict the outlet fluid temperature, which was independent of the thermal conductivity of the liquid phase when the thermal conductivity exceeded a critical value. Moreover, fluid dynamics and heat transfer around heat transfer tubes were numerically predicted using a two-dimensional model that takes into account the free convection heat transfer. Comparison of the numerical results given by the two models showed that the simplified model is applicable to energy thermal storage in which free convection dominates the heat transfer rate.

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  • Improvement of Heat Transfer Characteristic in a Solid-Gas Thermochemical Reactor

    Nakaso Koichi, Anai Mitsuhiro, Sasaki Yuichiro, Hamada Yuichi, Fukai Jun

    Asian Pacific Confederation of Chemical Engineering congress program and abstracts   2004   261 - 261   2004

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    Development of chemical heat pumps and dry sorption systems using solid-gas thermochemical reactors requires determining their optimal operating conditions. Many previous studies particularly noted that the performance of solid-gas thermochemical reaction would be reduced due to low heat transfer rate in the reaction beds. In this study, enhancement of effective thermal conductivity of reaction beds was therefore studied using magnesium oxide/water reaction, which was expected to be utilized for chemical thermal storage in a cogeneration system. High thermal conductive carbon fiber was installed into a reaction bed as a brush in order to be dispersed in the whole reaction bed and improve the effective thermal conductivity. In addition to the experiment, a two-dimensional mathematical model describing heat and mass transfer as well as chemical reaction rate was formulated and solved for its evaluation. Numerical results indicated that increasing the effective thermal conductivity essentially promoted the magnesium oxide/water chemical reaction rate. Qualitative agreement between experimental and theoretical results was obtained. Moreover, optimum operating conditions for a solid-gas thermochemical reactor were also discussed according to the results obtained in this study.

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  • ナノメータ材料の合成に関する評価と最適化

    中曽 浩一

    粉体工学会誌 = Journal of the Society of Powder Technology, Japan   40 ( 11 )   831 - 832   2003.11

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    DOI: 10.4164/sptj.40.831

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  • Effect of reaction temperature on CVD-made TiO2 primary particle diameter Reviewed

    K Nakaso, K Okuyama, M Shimada, SE Pratsinis

    CHEMICAL ENGINEERING SCIENCE   58 ( 15 )   3327 - 3335   2003.8

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    The effect of chemical reaction rate on the generation of titania nanoparticles by chemical vapor deposition using two different precursors was investigated by FTIR, XRD, and microscopy. The size of the primary particle exhibited a minimum with increasing reactor temperature. At lower reaction temperatures, the continuous and gradual formation of titania monomers occurred followed by coagulation and/or surface reaction on the existing particles. In addition, unreacted precursor condensed at the reactor exit. As the reaction temperature increased, the rate of monomer production increased, the dominant characteristics of particle growth were coagulation and sintering. The reactor temperature where the minimum primary particle diameter was produced was different for the two precursors due to differences in chemical reaction rates. Phase composition as well as the primary particle diameter of product titania were affected by the chemical reaction rate. Particle-laden reactor wall enhanced the precursor conversion at low reactor temperatures, where surface reactions compete effectively with gas-phase precursor conversion. (C) 2003 Elsevier Ltd. All rights reserved.

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  • Synthesis of non-agglomerated nanoparticles by an electrospray assisted chemical vapor deposition (ES-CVD) method Reviewed

    K Nakaso, B Han, KH Ahn, M Choi, K Okuyama

    JOURNAL OF AEROSOL SCIENCE   34 ( 7 )   869 - 881   2003.7

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    Non-agglomerated spherical silicon, titanium and zirconium oxide nanoparticles were prepared using an electrospray assisted chemical vapor deposition (ES-CVD) process. Metal alkoxides in conjunction with an electrospray method were used to introduce charged precursors into a CVD reactor. The ions are produced during evaporation of the charged droplets, and they probably act as seed nuclei (i.e., ion-induced nucleation) and/or, they are attached to the produced particles. The experimental results were compared with those obtained using a conventional evaporation CVD method. The particles generated using the conventional evaporation method were agglomerated to a considerable extent irregardless of the type of particle. Whereas, at the same conditions, high concentrations of non-agglomerated nanoparticles having diameters in the range of 10-40 nm were obtained using the ES-CVD method. This appears to be due to the charging effects of the generated particles, that is, the electrostatic dispersion of unipolarly charged particles. The size of the non-agglomerated particles in the ES-CVD method was reduced as the results of the decease in the concentration of precursors introduced by electrospray. (C) 2003 Elsevier Ltd. All rights reserved.

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  • Evaluation and Optimization of Vapor Phase Synthesis for Nanometer-Sized Materials Reviewed

    Koichi Nakaso

    Hiroshima University   2003.3

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  • Evaluation of the change in the morphology of gold nanoparticles during sintering Reviewed

    K Nakaso, M Shimada, K Okuyama, K Deppert

    JOURNAL OF AEROSOL SCIENCE   33 ( 7 )   1061 - 1074   2002.7

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    Morphological changes of agglomerates consisting of nanometer primary gold particles were studied experimentally and theoretically. Gold aerosol nanoparticles were produced using the evaporation/condensation method, and the change in agglomerate size by reheating was examined experimentally using a tandem DMA setup. Numerical calculations, based on two extreme mechanisms to reshape agglomerates, i.e., subsequent coalescence of primary particles and subsequent rearrangement of primary particles, were carried out. By comparison with the experimental results, the sintering time and the rate constant of restructuring were obtained. Using these values, the change in particle size for different generation conditions could be calculated. The change in morphology of agglomerates can be explained from the comparison of the experimental results with the theoretical calculations: agglomerates with smaller primary particles will compact mainly by the subsequent coalescence of primary particles, while agglomerates with larger primary particles will compact mainly by a rearrangement of primary particles. (C) 2002 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0021-8502(02)00058-7

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  • Size distribution change of titania nano-particle agglomerates generated by gas phase reaction, agglomeration, and sintering Reviewed

    K Nakaso, T Fujimoto, T Seto, M Shimada, K Okuyama, MM Lunden

    AEROSOL SCIENCE AND TECHNOLOGY   35 ( 5 )   929 - 947   2001.11

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    In the manufacturing of nanometer-sized material particlulates by aerosol gas-to-particle conversion processes, it is important to analyze how the gas-phase chemical reaction, nucleation, agglomeration, and sintering rates control the size distribution and morphology of particles. In this study, titania particles were produced experimentally by the thermal decomposition of titanium tetraisopropoxide (TTIP) and oxidation of titanium tetrachloride (TiCl4) using a laminar ? ow aerosol reactor. The effect of reaction temperature on the size and morphology of the generated particles was investigated under various conditions. The size distributions of agglomerates were measured using a DMA/CNC system. The size distributions of primary particles were measured using TEM pictures of the agglomerates sampled by a thermophoretic aerosol sampler. In order to model the growth of both agglomerates and primary particles simultaneously, a two-dimensional discrete-sectional representation of the size distribution was employed, solving the aerosol general dynamic equation for chemical reaction, agglomeration, and sintering. Qualitative agreement between the experimentally observed results and the simulation are satisfactory for the large variations in reactor temperature explored.

    DOI: 10.1080/02786820126857

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  • Unveiling the magic of H2S on the CVD-Al2O3 coating Reviewed

    T Oshika, A Nishiyama, Y Ito, K Nakaso, M Shimada

    KAGAKU KOGAKU RONBUNSHU   26 ( 6 )   749 - 753   2000.11

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    Achieving a uniform film thickness profile over a substrate has been difficult in CVD-Al2O3 coating processes. Although this problem can be solved by H2S-doping to the source gas mixture, AlCl3/CO2/H-2, the role of H2S in the mechanisms of the CVD coating have not been clarified. In this study, the effects of H2S-doping on the improvement of the uniformity of a coated layer is studied, focusing on the particles generated in the gas phase. it is found in the measurement of gasborne particles that the number concentration of particles larger than 200 nm in diameter is reduced dramatically by the H2S-doping. The concentration is over 10(8) particles/m(3) when no H2S is doped, while it is less than 10(6) particles/m(3) at 0.20% doping. The improvement of the coating by H2S-doping is concluded to be caused by a size reduction of particulate matters of the Al2O3 precursors that leads to an increase of the diffusivity.

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  • Control of particle generation in CVD reactor by ionization of source vapor Reviewed

    M Adachi, T Fujimoto, K Nakaso, TO Kim, K Okuyama

    KAGAKU KOGAKU RONBUNSHU   25 ( 6 )   878 - 883   1999.11

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    Two different ionization CVD reactors where the surface corona discharger is used as the ion source, are developed and film preparation by a tetraethoxysilane/ozone atmospheric pressure CVD is arrempted. In the close-type reactor where the discharger is close to the substrate, discontinuous films where thickness changes alternately and extremely from zero to a few microns in the distance of millimeter order are formed probably due to the charge of ions accumulated on the surface of Si wafer. In the separate-type reactor where the discharger is distant from the substrate, films with uniform thickness are formed, and the film growth rate is 1.3-1.5 times higher than that without discharge. The separate-type reactor prepared films with strong flow-like shape under conditions where films without flow-like shape are formed in the common reactor. Nanometer-sized particles of 20-100 nm in diameter, which have been generally generated without discharge, are not detected in the ionization CVD reactor.

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  • Film formation by motion control of ionized precursors in electric field Reviewed

    M Adachi, T Fujimoto, K Nakaso, K Okuyama, FG Shi, H Sato, T Ando, H Tomioka

    APPLIED PHYSICS LETTERS   75 ( 13 )   1973 - 1975   1999.9

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    A chemical vapor deposition (CVD) method, called ionization CVD, in which ionized source molecules were deposited on a substrate by Coulombic force, was developed to control gas-phase reaction and film morphology. This method was applied to the tetraethylorthosilicate (TEOS)/ozone-atmospheric pressure chemical vapor deposition process by using the surface corona discharge. TEOS/O-3 films deposited on SiN and SiO2 films by this CVD method showed good properties for the flow shape, the gap filling and the surface morphology. In Fourier-transform infrared spectra of gas-phase intermediates collected in the vapor condenser, the intensity of the absorption peak at 600 cm-1 was different between ionized intermediates and nonionized intermediates. (C) 1999 American Institute of Physics. [S0003-6951(99)04639-2].

    DOI: 10.1063/1.124889

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  • Unveiling the magic of H2S on the CVD-Al2O3 coating Reviewed

    T Oshika, A Nishiyama, K Nakaso, M Shimada, K Okuyama

    JOURNAL DE PHYSIQUE IV   9 ( P8 )   877 - 883   1999.9

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    The role of H2S in the mechanism of CVD-Al2O3 coating was investigated by measuring particles suspended in the gas phase with an optical particle counter. H2S doping of the CVD-Al2O3 process improves the homogeneity of thickness and growth rate of the Al2O3 layer. The number of particles produced in the reactor whose size was larger than 200 nm was dramatically reduced by H2S doping. The effect of H2S doping appears to be a reduction of the size of Al2O3 particles present in the reactor. These smaller particles have a greater mobility, which will allow them to arrive at the surface, regardless of the shape or arrangement of the substrate inside the reactor.

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Books

  • 熱エネルギーの有効活用に向けた蓄熱技術開発 = Development of thermal storage technology for efficient utilization of thermal energy

    中曽浩一( Role: Contributor ,  3.化学蓄熱の熱出力向上を目的とした伝熱促進技術の検討)

    シーエムシー出版  2022.4  ( ISBN:9784781316659

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  • Powder Technology Handbook, Fourth Edition

    Koichi Nakaso, Kuniaki Gotoh( Role: Contributor ,  Chapter 6.5, Temperature Measurement of Powder)

    CRC Press/Taylor & Francis  2019.11 

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  • CO2削減,省エネに関する新技術,採用事例,規則対応

    中曽 浩一( Role: Contributor ,  未利用熱エネルギー有効利用のための直接熱交換式の吸着式ヒートポンプ)

    技術情報協会  2017 

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  • 未利用熱エネルギー活用の新開発と【採算性を重視した】熱省エネ新素材・新製品設計/採用のポイント

    中曽 浩一, 深井 潤( Role: Contributor ,  低温廃熱有効活用水蒸気生成ヒートポンプシステムとその応用,技術課題への対応」)

    技術情報協会  2014 

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  • 実装可能なエネルギー技術で築く未来 骨太のエネルギーロードマップ2

    中曽 浩一, 深井 潤( Role: Contributor ,  Map3-5 産業用低温排熱再生技術のロードマップ)

    化学工業社  2010 

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  • 日本エアロゾル学会 編 エアロゾル用語集

    中曽 浩一( Role: Contributor ,  動力学「凝集」)

    京都大学学術出版会  2004 

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  • ナノ微粒子の“上手な”生成・合成・調整および付着・【事例をふまえた】凝集制御と分散安定化・計測・評価

    奥山 喜久夫, 中曽 浩一( Role: Contributor ,  ナノ微粒子の調整および分散・凝集コントロールとその評価)

    技術情報協会  2003 

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  • ナノ粒子の製造・評価・応用・機器の最新技術

    奥山 喜久夫, 中曽 浩一( Role: Contributor ,  気相法)

    CMC  2002 

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MISC

  • System Analysis on a Thermal Transistor for Heat Recovery Reviewed

    Hiroshi SUZUKI, Ruri Hidema, Yoshinori Itaya, Koichi Nakaso, Kimito Kawamura

    Proceedings of 26th InternationalCongress of Refrigeration   2023.8

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    DOI: 10.18462/iir.icr.2023.0096

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  • 化学工学年鑑2021 「4.熱工学 4.1相変化制御」 Invited

    中曽浩一

    化学工学   85 ( 10 )   515 - 516   2021.10

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  • 化学工学年鑑2020 「4.熱工学 4.1相変化制御」 Invited

    中曽浩一

    化学工学   84 ( 10 )   491 - 492   2020.10

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  • Characteristic Capillary Diameter to Evaluate Capillary Pressure of Ordered Particle Structures Based on Simulation of Two-Phase Flow

    山本知世, 三野泰志, 中曽浩一, 後藤邦彰

    粉体工学会誌   57 ( 8 )   2020

  • 化学工学年鑑2018 「4.熱工学 4.4相変化制御」 Invited

    中曽 浩一

    化学工学   82 ( 10 )   557 - 559   2018.10

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  • 化学工学年鑑2017 「4.熱工学 4.4相変化制御」 Invited

    中曽 浩一

    化学工学   81 ( 10 )   529 - 530   2017.10

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  • Adsorption Heat Pump for the Effective Utilization of Unused Thermal Energy Invited Reviewed

    Nakaso Koichi

    Journal of the Society of Powder Technology, Japan   53 ( 7 )   442 - 448   2016.7

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    <p>Unused thermal energy such as waste thermal energy from industrial processes is due to low temperature level and unstable output. For the effective utilization of the unused thermal energy, thermal energy storage, in particular chemical heat storage is a key technology. In this review, a novel adsorption heat pump, which is one of the chemical heat storage, is introduced. This system adopts a direct heat exchange method to the adsorption heat pump to increase heat transfer rate between adsorbent and heat transfer fluid. Basic operation and the methods to improve the efficiency of the heat pump system are explained.</p>

    DOI: 10.4164/sptj.53.442

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  • Enhancement of Generation of High-Temperature Steam from a Novel Adsorption Heat Pump Assisted by Thermal Energy Storage Material

    ( 29 )   23 - 32   2015

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  • CO2/O2/N2 雰囲気におけるガス化炉内熱流体解析 Invited

    中曽 浩一, A. Md. Saiful, A. T. Wijayanta, 深井 潤

    日本エネルギー学会誌   94   413 - 420   2015

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  • Enhancement of generation of high-temperature steam from a novel adsorption heat pump assisted by thermal energy storage material

    Koichi Nakaso, Shunsuke Kobayashi, Shotaro Eshima, Yoshiaki Kawakami, Masayuki Tanino, Jun Fukai

    Refrigeration Science and Technology   29   3711 - 3718   2015

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    Enhancement of generation of high-temperature steam using a novel adsorption heat pump is investigated. In this study, enhancement of the preheating process by the use of thermal energy storage material was investigated. The effect of the heat capacity of adsorbent on the mass of steam generated was theoretically investigated. As a result, while the mass of water vapor adsorbed during the preheating was increased with the heat capacity of the adsorbent, the temperature after the preheating process decreased. It was found that there was the maximum value in the mass of steam generated. In the experiment, an additive was inserted as the thermal energy storage material to increase the heat capacity of adsorbent. When the overall heat capacity of the packed bed of the adsorbent was increased by 18% by using the additive, the mass of steam generated per unit mass of the adsorbent was increased by 25%.

    DOI: 10.18462/iir.icr.2015.0090

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  • Development of Bench-Scaled Adsorption Type Steam Recovery System for Generating High Temperature Steam from Waste Water

    Y. Kawakami, Y. Abe, K. Ito, K. Marumo, T. Aoyama, M. Tanino, K. Nakaso, T. Nakagawa, Y. Itaya, J. Fukai

    高砂熱学工業技術研究所報   28 ( 28 )   87 - 94   2014

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  • 化学蓄熱を応用した低温熱回生技術

    中曽 浩一, 深井 潤

    化学工学   77 ( 3 )   172 - 174   2013

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  • Development of Adsorption Heat Pump System for Regenerating High Temperature Steam : Basic Concept and Estimation of Effective Utilization of Energy

    NAKASO Koichi, OKTARIANI Erfina, NODA Atsushi, ITAYA Yoshinori, NAKAGAWA Tsuguhiko, FUKAI Jun

    32 ( 5 )   316 - 316   2011.9

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  • Development of Exchangeable Fins for Heat Transfer Enhancement in Existing Shell and Tube Heat Exchangers

    H. Tanaka, K. Nakaso, N. Furumoto, T. Nakagawa, J. Fukai

    Journal of Environment and Engineering   6 ( 2 )   400 - 411   2011

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    To conventionally extend heat transfer area in shell-and-tube heat exchangers, a method is proposed where sheet materials with high thermal conductivities are stretched among tubes. The numerical simulations are carried out to predict the performance of heat exchanger with or without the sheets. As a result, it is found that thermal contact resistances between the sheet and tubes rather than thickness and thermal conductivity of the sheet influence overall heat transfer coefficient. In the experiments, the carbon fibers clothes (27 W m-1 K-1) are pass zigzag though the tubes whose pitch is 20 mm. The heat transfer rate between hot water flowing in the tube side and air in the shell side are measured. No substantial improvement of heat transfer is unfortunately observed experimentally due to contact thermal resistance. The method proposed in this study conclusively has a potential that the heat transfer rate improves no less than a few ten percents.

    DOI: 10.1299/jee.6.400

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  • Porous Media

    NAKASO Koichi

    49 ( 209 )   23 - 24   2010.10

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  • Detailed Reaction Mechanisms of Coal Volatile Combustion: Comparison between without Soot and Soot Models

    A. T. Wijayanta, A. Md. Saiful, K. Nakaso, J. Fukai

    J. Novel Carbon Res. Sci.   2   8 - 11   2010

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    Other Link: http://hdl.handle.net/2324/18392

  • Effect of heat transfer enhancement of heat exchanger for corrosive exhaust gases

    mitani hiroki, nakaso kouiti, nakagawa tuguhiko, fukai junn

    Proceedings of National Heat Transfer Symposium   2010 ( 0 )   323 - 323   2010

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    排ガスからの廃熱回収効率の改善策の一つとして,伝熱面拡大策を提案する.放射伝熱の影響する高温度域で伝熱管群内に張ったフィンの伝熱・流動特性の関係を数値的に検討した.パラメータとして,胴側 Reynolds数を5000~10000で変化させた際の伝熱促進の影響について検討した.流体として赤外活性気体のCO&lt;SUB&gt;2&lt;/SUB&gt;を想定し,伝熱管代表径を変化させた際の放射伝熱の寄与による伝熱促進の影響を確認した.また,フィンと伝熱管表面との接触抵抗を考慮することで実際のフィンの有効性についても検討した.

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  • Predictions of O2/N2 and O2/CO2 Mixture Effects during Coal Combustion using Probability Density Function

    A. Md. Saiful, A. T. Wijayanta, K. Nakaso, J. Fukai

    J. Novel Carbon Res. Sci.   2   12 - 16   2010

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    Other Link: http://hdl.handle.net/2324/18393

  • 炭素繊維を用いた粒子充填層内の伝熱促進

    中曽 浩一

    粉体工学会誌   46 ( 7 )   541 - 545   2009

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  • 既設熱交換器のための交換可能な伝熱促進フィンの提案

    田中 啓之, 中曽 浩一, 古本 直行, 中川 二彦, 深井 潤

    化学工学会 研究発表講演要旨集   2009 ( 0 )   455 - 455   2009

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    DOI: 10.11491/scej.2009.0.455.0

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  • Effect of Carbon Nanotube on Heat Transfer Rate in Packed Bed

    NAKASO K.

    J. Soc. Powder Technol., Japan   46   162 - 168   2009

  • ナノ粒子プロジェクトなどの研究開発動向と今後の課題

    奥山 喜久夫, 中曽 浩一

    工業材料   55 ( 11 )   18 - 24   2007

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  • 超微粒子製造プロセスの現状と問題点

    中曽 浩一

    ペトロテック   29 ( 10 )   733 - 738   2006

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  • 炭素繊維を用いた熱エネルギー利用機器の伝熱促進

    深井 潤, 中曽 浩一

    伝熱   45 ( 192 )   46 - 51   2006

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    DOI: 10.11368/htsj1999.45.192_46

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  • 306 Enhancement of Reaction Rates in Packed Bed Reactors for Thermal Equipment

    FUKAI Jun, NAKASO Koichi, ANAI Mitsuhiro, YOSHIMURA Akito, SHIGENAGA Ryousuke

    2005   87 - 88   2005.10

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  • DMEを用いたリバーニング技術によるNO低減

    真弓 久志, 山崎 一孝, 金田 昌之, 中曽 浩一, 山本 剛, 深井 潤, 中川 二彦

    化学工学会 研究発表講演要旨集   2005 ( 0 )   702 - 702   2005

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    DOI: 10.11491/scej.2005.0.702.0

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  • Prediction of Thermal Characteristics of Latent Heat Thermal Energy Storage Tanks Using Carbon-Fiber Cloths

    YOSHIMURA Akito, HAMADA Yuichi, NAKASO Koichi, FUKAI Jun

    Procee[d]ings of Thermal Engineering Conference   2004   99 - 100   2004.11

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    Thermal characteristics of laboratory- and practical-scale latent heat thermal energy storage tanks are investigated experimentally and theoretically. Commercial paraffin wax as the thermal energy storage material is packed in the tanks. Cloths made of high conductive carbon fibers are installed in the tanks to enhance the heat transfer rate in the tanks. Experimental results show that the thermal characteristics of the tanks are improved with increasing volume fraction of carbon fibers. A numerical model is developed to predict the thermal characteristics of the tanks. Optimum volume fractions of carbon fibers added in the tanks is numerically discussed.

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  • エアロゾルプロセスによる非凝集ナノ粒子材料の直接合成

    奥山 喜久夫, 中曽 浩一, 金 燦洙

    ケミカルエンジニアリング   49 ( 8 )   593 - 598   2004

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  • 一般動力学方程式による核生成・成長のシミュレーション

    奥山 喜久夫, 中曽 浩一, Hankwon Chang

    粉体工学会誌   39 ( 4 )   274 - 287   2002

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  • 気相合成プロセスによるナノ粒子の合成と性状の評価

    奥山 喜久夫, 中曽 浩一

    粉砕   45   31 - 40   2002

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  • ナノ粒子の合成と機能化

    奥山 喜久夫, 中曽 浩一

    混相流   16 ( 1 )   4 - 12   2002

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  • Preparation of Nano-particles by Aerosol Process

    OKUYAMA Kikuo, NAKASO Koichi

    Journal of the Research Association of Powder Technology, Japan   39 ( 9 )   670 - 678   2002

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    DOI: 10.4164/sptj.39.670

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    Other Link: https://jlc.jst.go.jp/DN/JALC/00158864073?from=CiNii

  • ナノ粒子製造と気相重合プロセス

    奥山 喜久夫, 中曽 浩一, 伊藤 佳史

    化学装置   44 ( 5 )   34 - 40   2002

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  • 連載講座 計算粉体工学(1)粒子生成・成長(1.1)一般動力学方程式による核生成・成長のシミュレーション

    奥山 喜久夫, 中曽 浩一, Hankwon Chang

    粉体工学会誌   39 ( 4 )   273 - 286   2002

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  • Synthesis and Functionalization Technology of Nano-Inorganic Material

    OKUYAMA Kikuo, NAKASO Koichi

    Inorganic Materials   8 ( 295 )   409 - 417   2001

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    DOI: 10.11451/mukimate2000.8.409

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  • Simulation of Generation and Growth Processes of Agglomerate Particles

    NAKASO Koichi, SHIMADA Manabu, OKUYAMA Kikuo

    Earozoru Kenkyu   15 ( 3 )   226 - 233   2000

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    Language:Japanese   Publisher:Japan Association of Aerosol Science and Technology  

    DOI: 10.11203/jar.15.226

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  • CVD法によるチタニアナノ粒子の製造に及ぼす製造条件の影響

    中曽 浩一, 伊藤 佳史, 福本 佳一, 藤本 敏行, 島田 学, 奥山 喜久夫

    化学工学シンポジウムシリーズ   73   179 - 182   2000

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  • Effects of preparation conditions on the characteristics of titanium dioxide particles produced by a CVD method

    K. Okuyama, M. Shimada, T. Fujimoto, T. Maekawa, K. Nakaso, T. Seto

    Journal of Aerosol Science   29 ( 2 )   S907 - S908   1998

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    DOI: 10.1016/S0021-8502(98)90636-X

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Presentations

  • 鉛直振動粉体層の流動・圧密挙動に対する加振条件の影響

    三角 薫花, 三野 泰志, 中曽 浩一, 後藤 邦彰

    粉体工学会2023年度 秋期研究発表会  2023.10.10 

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    Event date: 2023.10.10 - 2023.10.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 傾斜壁面付着粉体層の垂直加振による剥離・崩壊に対する影響因子の検討

    橋本 一晴, 三野 泰志, 中曽 浩一, 後藤 邦彰

    粉体工学会2023年度 秋期研究発表会  2023.10.10 

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    Event date: 2023.10.10 - 2023.10.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 毛管圧力測定に基づく粒子のぬれ性評価手法の検討

    井上 弘基, 三野 泰志, 中曽 浩一, 後藤 邦彰

    粉体工学会2023年度 秋期研究発表会  2023.10.10 

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    Event date: 2023.10.10 - 2023.10.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 直接熱交換式化学蓄熱に用いる蓄熱材の耐久性向上の検討

    中曽浩一, 岡田彩奈, 三野泰志, 後藤邦彰

    日本鉄鋼協会第186回秋季講演大会  2023.9.20 

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    Event date: 2023.9.20 - 2023.9.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 回転ディスクによるスラリー微粒化の温度条件が生成液滴径分布に及ぼす影響

    中山 覚仁, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会第54回秋季大会  2023.9.12 

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    Event date: 2023.9.11 - 2023.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 噴霧乾燥法におけるポリマー含有スラリー液滴の粒子形成機構

    山下 大智, 青山 祐太郎, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会第54回秋季大会  2023.9.11 

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    Event date: 2023.9.11 - 2023.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 含水率によって変化する粉粒体の流動性評価方法の検討

    中村 紗菜, 三野 泰志, 中曽 浩一, 後藤 邦彰

    化学工学会第54回秋季大会  2023.9.11 

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    Event date: 2023.9.11 - 2023.9.13

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  • 噴霧乾燥法におけるコロイド液滴乾燥時の粒子形成過程の評価

    青山 祐太郎, 山下 大智, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会第54回秋季大会  2023.9.11 

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    Event date: 2023.9.11 - 2023.9.13

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  • 尿素-水系吸熱反応を利用したオンデマンド空調システム開発における空気冷却法の検討

    梶本こはる, 中曽浩一, 三野泰志, 後藤邦彰, 丸岡伸洋, 埜上洋

    第35回中国四国伝熱セミナー・高松  2023.8.31 

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    Event date: 2023.8.31 - 2023.9.1

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  • 金属酸化物系化学蓄熱材成形体の耐久性評価

    矢原凛, 中曽浩一, 三野泰志, 後藤邦彰

    第35回中国四国伝熱セミナー・高松  2023.8.31 

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    Event date: 2023.8.31 - 2023.9.1

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  • System Analysis on a Thermal Transistor for Heat Recovery

    Hiroshi Suzuki, Ruri Hidema, Yoshinori Itaya, Koichi Nakaso, Kimito Kawamura

    International Conference on Refrigeration、 2023  2023.8.24 

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    Event date: 2023.8.21 - 2023.8.25

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  • Study on the development of a novel thermal energy sorage body composed of powdery thermal storage materials

    Kento Senoo, Koichi Nakaso, Yasushi Mino, Kuniaki Gotoh, Keita Taniya, Ruri Hidema, Hiroshi Suzuki

    2023.8.6 

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    Event date: 2023.8.4 - 2023.8.7

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  • Heat transfer enhancement in packed bed reactor for solid-gas chemical heat storage system Invited

    Koichi Nakaso, Kenji Shimada, Shogo Unemoto, Misato Torigoe, Yasushi Mino, Kuniaki Gotoh

    2023.8.5 

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    Event date: 2023.8.4 - 2023.8.7

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 新規蓄熱体開発のための粒子状蓄熱材の集積化の検討

    妹尾 健斗, 中曽 浩一, 三野 泰志, 後藤 邦彰, 谷屋 啓太, 日出間 るり, 鈴木 洋

    第60回日本伝熱シンポジウム  2023.5.27 

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    Event date: 2023.5.25 - 2023.5.27

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  • 硬殻マイクロカプセル化蓄熱材の熱伝導改善に関する研究

    鈴木 洋, 中島 彩菜, 中曽 浩一, 谷屋 啓太, 日出間 るり

    第60回日本伝熱シンポジウム  2023.5.27 

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    Event date: 2023.5.25 - 2023.5.27

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  • 気固系化学蓄熱の熱出力向上のための粒子間架橋形成法の検討

    中曽 浩一, 嶋田 健二, 三野 泰志, 後藤 邦彰

    第60回日本伝熱シンポジウム  2023.5.26 

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    Event date: 2023.5.25 - 2023.5.27

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  • 食品粉体をオンデマンド製造するための原料液滴乾燥過程の詳細評価法の検討

    中曽浩一

    粉体工学会2023年度春期研究発表会  2023.5.15 

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    Event date: 2023.5.15 - 2023.5.16

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  • 加圧条件下におけるゼオライトの発熱特性

    山根 伶雄, 中曽 浩一, 松村 幸彦

    第57回日本伝熱シンポジウム 

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    Event date: 2020.6.3 - 2020.6.5

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  • 鉛直加振ホッパーからの粉体排出量の時間変動特性

    中村 志帆, 三野 泰志, 中曽 浩一, 後藤 邦彰

    化学工学会 岡山大会2022  2022.12.19 

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  • 粒子懸濁液の乾燥による粒子配列過程の数値解析

    田中 千賀, 三野 泰志, 中曽 浩一, 後藤 邦彰

    化学工学会 岡山大会2022  2022.12.19 

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  • 粒子懸濁液の流動性に与える粒子間相互作用力の影響

    田中 葉月, 三野 泰志, 中曽 浩一, 後藤 邦彰

    粉体工学会2022年度 秋期研究発表会  2022.12.6 

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  • マイクロカプセル化PCM集積体設計のための数値的検討

    中曽 浩一, 妹尾 健斗, 三野 泰志, 後藤 邦彰, 谷屋 啓太, 日出間 るり, 鈴木 洋

    第11回潜熱工学シンポジウム  2022.10.31 

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  • 粒子懸濁液の乾燥過程において粒子表面特性が配列構造に及ぼす影響

    田中 千賀, 三野 泰志, 中曽 浩一, 後藤 邦彰

    化学工学会第53回秋季大会  2022.9.16 

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  • 噴霧乾燥法における液滴乾燥条件が生成粒子の内部構造に及ぼす影響の検討

    青山 祐太郎, 山下 大智, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会第53回秋季大会  2022.9.14 

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  • 噴霧乾燥法におけるバインダー含有スラリー液滴の乾燥過程の評価

    山下 大智, 青山 祐太郎, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会第53回秋季大会  2022.9.14 

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  • ケミカル冷熱生成による排熱利用型オンデマンド空調の基礎検討

    梶本 こはる, 中曽 浩一, 三野 泰志, 後藤 邦彰, 丸岡 伸洋, 埜上 洋

    第59回日本伝熱シンポジウム  2022.5.18 

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  • 気固系化学蓄熱の熱出力向上のための 粒子充填層内伝熱促進

    中曽 浩一, 嶋田 健二, 畝本 将吾, 三野 泰志, 後藤 邦彰

    第10回 潜熱工学シンポジウム  2021.11.29 

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  • DEM simulations of cohesive particle behavior in a shear field

    Natsuk Kawakami, Yasushi Mino, Koichi Nakaso, KuniakiGotoh

    8th Asian Particle Technology Symposium  2021.10.13 

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  • Lattice Boltzmann model for capillary forces between cylindrical particles at gas-liquid interface

    Hazuki Tanaka, Yasushi Mino, Koichi Nakaso, KuniakiGotoh

    8th Asian Particle Technology Symposium  2021.10.13 

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  • Lattice Boltzmann model for evaporation of colloidal suspensions

    Yasushi Mino, Chika Tanaka, Koichi Nakaso, KuniakiGotoh

    8th Asian Particle Technology Symposium  2021.10.12 

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  • 回転ディスクによる噴霧の温度条件が生成液滴径分布に及ぼす影響

    原田 菜々子, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会 第52回秋季大会  2021.9.22 

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  • 毛管力に駆動される粒子配列挙動の数値シミュレーション

    三野 泰志, 田中 葉月, 中曽 浩一, 後藤 邦彰

    化学工学会 第52回秋季大会  2021.9.22 

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  • 粒子間架橋形成による気固系化学蓄熱の伝熱促進の検討

    嶋田 健二, 中曽 浩一, 三野 泰志, 後藤 邦彰

    化学工学会 第52回秋季大会  2021.9.22 

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  • 粒子間架橋形成による粒子充填層内伝熱促進とその効果

    中曽 浩一, 畝本 将吾, 嶋田 健二, 三野 泰志, 後藤 邦彰

    第 58回日本伝熱シンポジウムプログラム  2021.5.25 

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  • 尿素/水系ケミカル空調システムにおける尿素再生過程の高速化の検討

    中曽浩一, 高橋秀和, 三野泰志, 後藤邦彰, 丸岡伸洋, 埜上洋

    日本鉄鋼協会 第181回春季講演大会  2021.3.19 

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  • 流動層造粒における造粒物粒子径制御のための操作条件の検討

    川上奈月, 三野泰志, 中曽浩一, 後藤邦彰

    化学工学会 広島大会2020  2020.12.11 

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  • 熱移動を伴う粉粒体プロセスの評価と制御 Invited

    中曽浩一

    化学工学会 エネルギー部会 熱利用分科会 第9回若手セミナー  2020.12.11 

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  • 空気輸送管内での粒子付着低減のための表面研磨指針の検討

    石田優奈, 三野泰志, 中曽浩一, 後藤邦彰

    化学工学会 広島大会2020  2020.12.11 

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  • 粒子層圧縮過程における応力伝播に底面形状が及ぼす影響

    加藤敬亮, 三野泰志, 中曽浩一, 後藤邦彰

    化学工学会 広島大会2020  2020.12.11 

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  • Heat generation from zeolite under high temperature and pressure

    Reo Yamane, Koichi Nakaso, Yukihiko Matsumura

    Inernational Symposium on Fuel and Energy 2020  2020.12.7 

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  • Zeplite Utilization for High temperature Heat Generation

    Reo Yamane, Koichi Nakaso, Yukihiko Matsumura

    The 9th Joint Conference on Renewable Energy and Nanotechnology (JCREN 2020)  2020.10.28 

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  • 噴霧乾燥法における粒子生成過程に及ぼす原料液滴まわりの温度場および流動場の影響

    中曽 浩一, 板野 竜也, 川口 智久, 三野 泰志, 後藤 邦彰

    第57回粉体に関する討論会  2019.11.25 

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  • 熱エネルギー有効活用のための化学蓄熱と実装への課題 Invited

    中曽 浩一

    日本鉄鋼協会 熱経済技術部会大会  2019.11.11 

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  • 粉体製造プロセス開発の効率化のための噴霧乾燥法における粒子生成過程の詳細評価

    中曽 浩一, 清水 歩弥, 板野 竜也, 川口 智久, 三野 泰志, 後藤 邦彰

    第36回エアロゾル科学・技術研究討論会  2019.9.6 

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  • 熱エネルギー有効利用のための伝熱促進技術 Invited

    中曽 浩一, 深井 潤

    平成30年度中国四国伝熱セミナー・岡山  2018.9.8 

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  • 熱工学(基礎) Invited

    中曽 浩一

    岡山地区化学工学懇話会 平成30年度 化学工学基礎講習会  2018.8.28 

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  • 混合熱を利用した冷熱生成システムの検討

    中曽 浩一, 筒井 優衣, 三野 泰志, 後藤 邦彰

    第55回 日本伝熱シンポジウム  2018.5.29 

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  • 直接熱交換式化学蓄熱の高効率化の検討 Invited

    中曽 浩一, 後藤 邦彰, 小林 俊介, 永山 瑞起, 深井 潤

    第7回 潜熱工学シンポジウム  2017.12.8 

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  • 吸着材充填層内の熱物質移動 Invited

    中曽 浩一, 後藤 邦彰, 江島 匠太郎, 深井 潤

    平成29年度 化学工学会 熱工学部会講演会,第48回 中部化学関係学協会支部連合秋季大会  2017.11.11 

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  • Strategies to enhance heat transfer rate in chemical heat storage system Invited International conference

    Koichi Nakaso

    The 8th China-Japan Symposium on Chemical Engineering  2017.10.15 

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  • Effect of the bridge formed between particles on heat transfer enhancement and gas permeability in the packed bed reactors International conference

    Koichi Nakaso, Kuniaki Gotoh

    EMECR2017  2017.10.11 

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  • 中低温排熱有効利用のための化学蓄熱 Invited

    中曽 浩一

    熱エネルギー有効活用のための蓄熱技術  2017.7.14 

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  • 未利用熱エネルギー有効利用のための蓄熱技術と伝熱促進の検討 Invited

    中曽 浩一

    岡山地区化学工学懇話会 平成29年度特別講演会  2017.5.8 

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▼display all

Industrial property rights

  • サーマルサーキットシステム

    鈴木洋, 日出間るり, 板谷義紀, 加藤之貴, 小林敬幸, 窪田光宏, 中曽浩一, 川村公人, 藤岡惠子, 可貴裕和, 丸毛謙次

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    Applicant:国立大学法人神戸大学,東海国立大学機構,国立大学法人東京工業大学,国立大学法人岡山大学,アサヒグループホールディングス株式会社,株式会社ファンクショナル・フルイッド,日新電機株式会社,森松工業株式会社

    Application no:特願2022-91887  Date applied:2022.6.6

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  • 空気の冷却方法

    中曽浩一, 梶本こはる, 後藤邦彰, 三野泰志

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    Applicant:国立大学法人 岡山大学

    Application no:特願2022-77752  Date applied:2022.5.10

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  • 蒸気生成装置、及び蒸気生成方法

    川上 理亮, 谷野 正幸, 安部 義男, 伊藤 香澄, 深井 潤, 板谷 義紀, 中川 二彦, 中曽 浩一

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    Application no:特願2013-178565  Date applied:2013.8.29

    Announcement no:特開2015-64192  Date announced:2015.4.9

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Awards

  • Outstanding Paper Award of 2012

    2013.3   化学工学会  

    安松 祥平, 中曽 浩一, 深井 潤

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  • 2010年度粒子・流体プロセス部会フロンティア賞

    2011.3   化学工学会 粒子・流体プロセス部会  

    吉竹 祐, 安松 祥平, 金田 昌之, 中曽 浩一, 深井 潤

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  • 部会活動功労賞

    2010.9   化学工学会  

    中曽 浩一

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  • 2006年度 化学工学会熱工学部会賞

    2006.9   化学工学会 熱工学部会  

    北里 優介, 重永 亮介, 吉村 昭人, 中曽 浩一, 深井 潤

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  • 第21回空気清浄とコンタミネーションコントロール研究大会 会長奨励賞

    2003.4   日本空気清浄協会  

    中曽 浩一

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Research Projects

  • 3Dプリンティング技術を駆使したケミカルヒートバッテリーシステムの開発

    2023.04 - 2025.03

    日本鉄橋協会  第2回鉄鋼カーボンニュートラル研究助成 

    中曽浩一

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    Authorship:Principal investigator 

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  • 化学反応熱によるコールドサーマルバッテリーの高出力化の検討

    2023.04 - 2024.03

    物質・デバイス領域共同研究拠点  基盤共同研究 

    中曽浩一,埜上洋

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    Authorship:Principal investigator 

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  • 産業CN に向けたサーマルサーキットの開発

    2022.06 - 2023.03

    国立研究開発法人新エネルギー・産業技術総合開発機構(NEDO)  先導研究プログラム エネルギー・環境新技術先導研究プログラ ム 

    中曽浩一

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    Authorship:Coinvestigator(s) 

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  • 化学反応熱によるコールドサーマルバッテリーの開発

    Grant number:20221314  2022.04 - 2023.03

    物質・デバイス領域共同研究拠点(NJRC)  基盤共同研究

    中曽浩一, 埜上 洋

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  • 食品粉体をオンデマンド製造するための原料液滴乾燥過程の詳細評価法の検討

    2021.04 - 2023.03

    粉体工学情報センター  第17回 2021年度研究助成 

    中曽浩一

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  • 作業環境改善のための排熱利用型ケミカル冷熱生成システムの検討

    2019.04 - 2021.03

    日本鉄鋼協会  鉄鋼研究振興助成 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 食品粉体の製造プロセス開発を加速するための噴霧乾燥法の詳細評価法の検討

    2019.04 - 2020.03

    粉体工学情報センター  研究助成 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 家庭用瞬間湯沸器の安全運転および省エネのための蓄熱システム適用検討

    2018.04 - 2019.03

    パロマ環境技術開発財団  パロマ環境技術開発財団研究助成 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 分散型エネルギーシステム構築のための化学蓄熱セルシステムの要素研究

    2016.04 - 2019.03

    日本学術振興会  科研費 基盤研究(C) 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 粒子充填層におけるガス透過性を有する伝熱促進の検討

    2015.04 - 2016.03

    (公財)ホソカワ粉体工学振興財団  平成27年度研究助成 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 化学蓄熱を用いた太陽光熱利用高温蒸気生成システムの開発

    2013.04 - 2016.03

    日本学術振興会  科研費 基盤研究(C) 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 化学プラントから排出される中低温熱有効利用のための新規化学蓄熱プロセスの提案

    2010.04 - 2012.03

    日本学術振興会  科研費 若手研究(B) 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • スパイラル炭素繊維付き伝熱管とヒートパイプを併用した高性能水素貯蔵装置の開発

    2008.09 - 2010.08

    マツダ財団  第24回(2008年度)マツダ研究助成 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 水素吸蔵合金アクチュエータ内移動現象の詳細解析と炭素繊維による高性能化

    2006.04 - 2008.03

    日本学術振興会  科研費 若手研究(B) 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • Promotion of reaction rates in packed bed reactors of metal hydride by heat transfer enhancement

    2005.09

    矢崎科学技術振興記念財団  国際交流援助 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • 炭素繊維熱伝導促進技術を応用した運動支援用小型水素アクチュエータの開発

    2005.04 - 2006.03

    御器谷科学技術財団  研究助成 

    中曽 浩一

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    Authorship:Principal investigator  Grant type:Competitive

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  • ナノ材料による水素貯蔵システムの熱工学的課題の解決

    Grant number:17656254  2005 - 2006

    日本学術振興会  科学研究費助成事業  萌芽研究

    深井 潤, 中曽 浩一

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    研究最終年度にあたる本年度は,昨年度に引き続き,(1)伝熱促進が水素吸蔵合金の水素吸蔵・放出反応速度へ及ぼす影響を検討し,(2)実際に粒子充填層内ヘナノ材料を添加し,伝熱促進効果が得られるかについて検討した.(2)について詳しく説明すると,(理論上の)熱伝導率が1200W/mKと非常に大きいカーボンナノチューブ(CNT)を用い,これを粒子充填層(モデル実験としてガラスビーズを用いた)へ添加した.単純に粒子とCNTを混合させるだけでは粒子間隙や壁面近傍の空隙にCNTを配置できず嵩高くなるだけであるため,いったんCNTを液中に分散させ,この混合液とガラスビーズを混ぜて乾燥させる手法により複合化を行った.CNT添加量と有効熱伝導率・壁面の熱伝達係数を温度応答計測により求めた.この結果,粒子径0.1mmの粒子充填層にCNTを約7vol.%添加することで約0.31W/mKから約0.67W/mKまで2倍程度有効熱伝導率を促進できた.さらに,先ほどよりも10倍直径が大きい粒子径1.0mmの粒子を用いて検討したところ,粒子径01mmの場合と同じ添加量であるにもかかわらず有効熱伝導率を約4倍に促進できた.これは,充填層に用いる粒子サイズが大きい場合,空隙のサイズも大きくなるため,CNTによる伝熱促進がより効果的であったためである.ここで,CNT添加量が比較的少ない場合,有効熱伝導率はほとんど変化しなかったが,約2.5vol.%以上で大きく向上がみられた.よってこの点においてCNTの伝熱促進効果が表れ始めたと考えられる.同様に充填層一容器内壁問の熱伝達係数についても検討したところ,何も添加しない場合,100W/m^2K程度であったが,有効熱伝導率の場合と同様に,CNT添加量が約2.5vol.%以上で効果があらわれ始め,結果として数倍から10倍程度以上に向上できた.

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  • 計算機支援による水素利用システムの最適化および炭素繊維による高性能化

    2004.04 - 2006.03

    旭硝子財団  自然科学系研究助成 

    中曽 浩一

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  • MECHANISM OF THE FILM FORMATION BY THE INKJET PRINTING METHOD

    Grant number:16360387  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    FUKAI Jun, TAKAHARA Atushi, YAMAMOTO Tsuyoshi, KANEDA Masayuki, NAKASO Koichi

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    Grant amount:\15100000 ( Direct expense: \15100000 )

    For the inkjet printings of the polymer solution droplet (d= 30-100 μm), the effects of the physical properties of the solvent, the initial solute concentration and the surface wettability are studied. The evaporation process of the droplet is observed and the resulted film shape is measured.
    1. Deposited on the lyophobic surface, ring-like films form at the high initial solute concentration and the high evaporation rate. This is due to the internal flow after the pinning of the contact line. The internal flow depends on the viscosity which decreases at the fast pinning.
    2. On the lyophilic surface, dot-like films form at the high initial solute concentration. The binary solvent with the different boiling points is the breakthrough to control the film shape for the inkjet printings.
    3. The binary-solvent inkjet printings increase the droplet viscosity at the pinning, which is the primary factor that the binary solvent affects the film shape.
    4. The circulating source flow at the cross section of the droplet is observed by the flow visualization. This flow cannot be understood by the Marangoni convection due to the temperature difference on the surface.
    5. The numerical simulation clarified that visualized flow is due to the natural convection by the density difference between the surface and the bulk of the droplet. This density difference is due to the solute concentration.
    6. The strong convection is observed for the high initial solute concentration. This conflicts the high viscosity at the high solute concentration. This unexpected phenomenon is also understood by the natural convection due to the solute concentration.
    7. The droplet ejected on the lyophobic/lyophilic patterned surface deposits on the lyophilic part. To delay the pinning time on the lyophilic part is found to be important to deposit on the lyophilic part.

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