研究者詳細 - 南川　久人

論文 - 南川　久人

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Prediction models of void fraction and pressure drop for gas-liquid slug flow in microchannels 査読国際誌

Kurimoto R., Nakazawa K., Minagawa H., Yasuda T.

Experimental Thermal and Fluid Science 88 124 - 133 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 参加形態：共同（副担当）

© 2017 Elsevier Inc. The void fraction and pressure drop of gas-liquid slug flow in a circular microchannel were measured using a high-speed video camera and image processing method. Water and two types of glycerol-water solutions were used as the liquid phase, and N2 gas was used as the gas phase. Four microchannels with different diameters (200, 320, 500, and 700 μm) were used. The measured data were compared with the existing and newly developed models. The following conclusions were obtained: (1) the pressure drop was predicted using the model proposed by Warnier et al. (2010) with the liquid film thickness model proposed by Han and Shikazono (2009) within ±20%, (2) a distribution parameter model developed in this study can predict the distribution parameter within ±10% and is more reliable than the other models.

DOI： 10.1016/j.expthermflusci.2017.05.014

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85020047273&origin=inward

Effect of collision and velocity model of lattice Boltzmann model on three-dimensional turbulent flow simulation 査読国際誌

Yasuda T., Hashimoto T., Tanno I., Tanaka Y., Minagawa H., Morinishi K., Satofuka N.

International Journal of Computational Fluid Dynamics 31 ( 4-5 ) 258 - 268 2017年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Taylor & Francis 参加形態：共同（副担当）

© 2017 Informa UK Limited, trading as Taylor & Francis Group. Various collision and velocity models of the lattice Boltzmann model (LBM) were compared to determine their effects on the efficiency of a three-dimensional homogeneous isotropic decaying turbulent flow simulation. We determined that a decrease in the number of velocities, in particular, 13-velocities, which can be used in the quasi-equilibrium lattice Boltzmann and in the multiple-relaxation time models (MRT), could considerably decrease the computational effort. However, decreasing the number of velocities deteriorates the stability and the accuracy of the results. By comparing the collision models, we also determined that the stability of the entropic lattice Boltzmann model (ELBM), and 19- and 27- velocity MRT is much higher than in other models. However, the numerical viscosity introduced by the ELBM underestimates the enstrophy, and the computational effort increases because of the calculation overhead required to solve the additional equations if special care is not given to the calculation.

DOI： 10.1080/10618562.2017.1333605

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85020317004&origin=inward

Velocity and shape of single bubble in horizontal cylindrical channel 査読国際誌

Ryo Kurimoto, Hisato Minagawa, Takahiro Yasuda

11th International Symposium on Advanced Science and Technology in Experimental Mechanics 1 - 5 2016年11月

Effects of surfactant on quasi-static bubble growth from an orifice 査読国際誌

Ryo Kurimoto, Takahiro Yasuda, Hisato Minagawa

Chemical Engineering and Processing: Process Intensification 104 154 - 159 2016年6月

マイクロバブルを含んだ鉛直円管内乱流の摩擦抵抗に関する研究査読

南川久人，坂井和正，栗本遼，安田孝宏

日本機械学会論文集 80 ( 817 ) 1 - 11 2014年9月

A Study on Efficient Simulation for Incomplessible 3- dimensional Turbulence Flow using Lattice Boltzmann Model

Takahiro Yasuda, Tomohisa Hashimoto, Itaru Tanno, Yoshihiro Tanaka, Hisato Minagawa, Koji Morinish, Nobuyuki Satofuka

Proc. of The Eighth International Conference on Computational Fluid Dynamics (ICCFD8), Chengdu, Sichuan, China, July 14-18, 2014 ( 442 ) 1 - 8 2014年7月

低レイノルズ数領域で用いる水中グライダーの翼断面形状に関する研究査読

江端重葉，安田孝宏，南川久人，宮本悠治，里深信行

日本機械学会論文集Ｂ編 79 ( 806 ) 1886 - 1899 2013年10月

マイクロチューブ内気液二相スラグ流のボイド率と摩擦圧力損失査読

南川久人，浅間浩明，安田孝宏

日本機械学会論文集Ｂ編 79 ( 804 ) 1500 - 1513 2013年8月

Efficient simulation for incompressible turbulent flow using lattice Boltzmann model 査読

Takahiro Yasduda, Tomohisa Hashimoto, Hisato Minagawa, Koji Morinish and Nobuyuki Satofuka

Procedia Engineering 61 173 - 178 2013年7月

Drag Reduction of Vertical Pipe Water Flow with Micro Bubbles

Hisato MINAGAWA, Takahiro YASUDA, Toichiro SOGABE and Kazumasa SAKAI

6th Japanese-European Two-Phase Flow Group Meeting Kumamoto, 23-27 September 2012 1 ( S10-3 ) 1 - 6 2012年9月

Study on highly efficient numerical simulation of flow using thirteen velocity quasi-equilibrium lattice Boltzmann model

Takahiro Yasuda, Tomohisa Hashimoto, Itaru Tanno, Yoshihiro Tanaka, Hisato Minagawa

Proc. of European Congress on Computational Methods in Applied Sciences and Engineering MS200-2 ( 1726 ) 1 - 6 2012年9月

An In-Situ Experiment on Oxygen Solubility of Micro-Bubble Aeration in A Eutrophic Dam-Reservoir 査読

Koji MICHIOKU, Hisato MINAGAWA, Satoshi YAMADA, Tomoaki IKEGUCHI, Natsuko OHKAWA

Proceedings of the International Symposium on DAMS FOR A CHANGING WORLD, June 5, 2012, Kyoto 1 ( 2 ) 99 - 104 2012年6月

Enhancement of Microbubble Generation in a Dissolution Process by Packing the Nozzle with Porous Ceramics 査読

Hiroshi YAMASHITA, Hideki AOYAGI and Hisato MINAGAWA

Water Science and Technology 65 ( 1 ) 69 - 75 2012年1月

The Effect of Fine Particles Added into Water on the Motion of Bubbles Rising Helically 査読

Hisato MINAGAWA and Takahiro YASUDA

Proceedings of the ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC2011, March 13-17, 2011, Honolulu, Hawaii, USA Paper No.AJTEC2011-44406 1 - 8 2011年3月

酸素マイクロバブルを用いた貯水池曝気実験における水質改善効果の検討査読

南川久人，道奥康治，山田哲史，安田孝宏

実験力学 10 ( 1 ) 39 - 44 2010年3月

直線並びに螺旋上昇気泡運動に及ぼす混入微細粒子の影響査読

南川久人，安田孝宏

混相流 23 ( 5 ) 539 - 545 2010年3月

マイクロバブルを用いた超音波流速分布計による鉛直管内乱流の速度分布と速度変動の測定査読

南川久人，安田孝宏，石田智己

日本機械学会論文集Ｂ編 75 ( 750 ) 235 - 240 2009年2月

静止液中における単一大気泡周囲液相部のPIV計測査読

塩見洋一，野口佳樹，南川久人，田中康恵

混相流 22 ( 3 ) 273 - 279 2008年9月

Contact measurement of turbulent intensity of the pipe flow using UVP

Hisato MINAGAWA, Tomoki ISHIDA and Takahiro YASUDA

6th International Symposium on Ultrasonic Doppler Method for Fluid Mechanics and Fluid Engineering, Prague 1 127 - 130 2008年9月

静止水中を上昇する単一大気泡周囲液相流れ場への管内径の変化が及ぼす影響査読

南川久人，山田哲史，安田孝宏，塩見洋一

混相流 22 ( 2 ) 154 - 160 2008年6月

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