研究者詳細 - 南川　久人

論文 - 南川　久人

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Nanobubbles in vase water inhibit transpiration and prolong the vase life of cut chrysanthemum flowers 査読

Plant-Environment Interactions 4 ( 6 ) 309 - 316 2023年12月

マイクロバブルのゼータ電位が水耕コマツナの生育に及ぼす影響査読

南川久人, 松村　怜, 畑　直樹，原田英美子，栗本遼, 安田孝宏，宮嵜一樹

実験力学 18 ( 3 ) 214 - 221 2018年9月

マイクロバブルがホウレンソウの発芽および生育に与える影響査読

南川久人，藤原　海，栗本　遼，安田孝宏，原田英美子，畑　直樹

実験力学 16 ( 1 ) 77 - 83 2016年3月

ピッチング運動する前縁波形状翼の非定常流体力特性に関する研究査読

土井一輝，安田孝宏，中田瑛，南川久人

日本機械学会論文集 89 ( 924 ) 1 - 15 2023年8月

直列配置された前縁直線翼および前縁波形状翼の剥離抑制機構に関する研究査読

植木彩水，安田孝宏，安井晴紀，土井一輝，南川久人

日本機械学会論文集 89 ( 917 ) 1 - 19 2023年1月

Liquid film thickness of upward air–water annular flow after passing through 90° bend 査読

Kurimoto R., Takeuchi Y., Minagawa H., Yasuda T.

Experimental Thermal and Fluid Science 139 2022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：Experimental Thermal and Fluid Science

Axial development of the base film thickness of an upward air–water annular flow after passing through a 90° bend was investigated. The pipe diameter D of the channel was 5.0 mm. The ratios, R*, of the radius of curvature of a bend to D were 6.0 and 10. The dimensionless axial distances, z* (=z/D), of measurement positions were 4, 12 and 20, where z is the axial coordinate in the vertical section. The circumferential measurement positions, θ, from the outer side to the inner side of the bend at each z* were 0, 45, 90, 135 and 180°. The liquid film thicknesses on the top and bottom sides in the horizontal section were also measured. At z* = 4, the base film at θ = 0° was thicker than that at the other θ in most of the present experimental conditions. In contrast, the circumferential distribution of the base film thickness was symmetric even at z* = 4 in the cases of high gas volumetric flux and low liquid volumetric flux. The circumferential distributions of the base film thicknesses at z* = 12 and 20 were symmetric in all experimental conditions. At z* = 12 and 20, the circumferential averaged base film thickness after passing through the bend with R* = 10 was larger than that after passing through the bend with R* = 6. The axial velocity in the liquid film was also measured. The circumferential distribution of the axial velocity was nearly symmetric at z* = 12 and 20.

DOI： 10.1016/j.expthermflusci.2022.110735

Scopus

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Visualization of Flow around Turrets of Cup Labeling Machine 査読国際誌

Naoki MATSUMOTO ,Takahiro YASUDA，Hisato MINAGAWA， Takashi OGAWA，Yoshinobu TAKAYAMA and Takanori MIURA

Proceedings of 16th International Symposium on Advanced Science and Technology in Experimental Mechanics 37 - 42 2021年11月

The Mechanism of the Separation Control by a Wing with Leading Edge Protuberance and Tandemly Arranged Wings with Linear Leading Edge 査読国際誌

Ayami UEKI ,Takahiro YASUDA，Hisato MINAGAWA

Proceedings of 16th International Symposium on Advanced Science and Technology in Experimental Mechanics 22 - 24 2021年11月

Pressure drop of gas–liquid Taylor flow in square microchannels 査読

Kurimoto R., Tsubouchi H., Minagawa H., Yasuda T.

Microfluidics and Nanofluidics 24 ( 1 ) 2020年1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：Microfluidics and Nanofluidics

© 2019, Springer-Verlag GmbH Germany, part of Springer Nature. The pressure difference in gas–liquid Taylor flow in square microchannels with three different hydraulic diameters (190, 298, and 505 μm) were measured. Three liquids (Water and two types of glycerol-water solutions) were used as the liquid phase, and N2 gas was used as the gas phase. The experiments were carried out for the ranges of 1.98 × 10−3 < CaT < 0.132 and 2.61 < ReT < 661, where CaT and ReT are the capillary and Reynolds numbers based on the total volumetric flux, respectively. The measured pressure drop of Taylor bubbles based on the unit cell model was compared with existing models, and large discrepancies could be recognized. Dimensionless pressure drop of a Taylor bubble increased with the capillary number, and depends on the liquid viscosity and the hydraulic diameter at the same capillary number in the middle and high capillary number region, i.e., the inertia effect. Hence, a new pressure drop model including these effects as dimensionless numbers was developed based on the relationship between the pressure drop and liquid film thickness of a Taylor bubble, and it could show good agreement with the measured data. The pressure drop of Taylor flow could also be evaluated using the unit cell model with the developed model. In addition, a pressure drop model for Taylor flow based on only the total volumetric flux was developed in terms of convenience of prediction.

DOI： 10.1007/s10404-019-2307-x

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85076433978&origin=inward

Effects of surfactant on gas-liquid Slug flow in circular microchannels 査読国際誌

Ryo Kurimoto, Hisato Minagawa, Takahiro Yasuda

Multiphase Science and Technology 31 ( 3 ) 273 - 286 2019年11月

A study on the reduction of wave resistance using wave interference by trimaran 査読国際誌

S. Fujimura, T. Yasuda, H. Minagawa, R. Kurimoto

Proc. 12th Pacific Symposium on Flow Visualization and Image Processing, 19-22 November, 2019, New Taipei City, Taiwan ( No.38 ) 1 - 5 2019年11月

Development of New Agriculture and Aquaculture Technology Using Fine Bubbles 査読

T. Hata, Y. Nishiuchi, and H. Minagawa

International Journal of Plasma Environmental Science & Technology 12 ( 9 ) 39 - 43 2019年7月

Improvement in wing performance using a wing with sinusoidal leading edge (The effect of the wing camber and the wing camber position) 査読

Keita Fukui, Takahiro Yasuda, Hisato Minagawa, Ryo Kurimoto

Journal of Aero Aqua Bio-mechanisms 8 ( 1 ) 13 - 19 2019年3月

Numerical investigation of bubble shape and flow field of gas–liquid slug 査読国際誌

Ryo Kurimoto, Kosuke Hayashi, Hisato Minagawa, AkioTomiyama

International Journal of Heat and Fluid Flow 74 28 - 35 2018年12月

A study on the wing performance and the passive separation control of two tandem arranged NACA0012 wing using leading edge protuberance in low Reynolds number 国際誌

Taito Inoue, Takahiro Yasuda, Hisato minagawa, Ryo Kurimoto

Proceedings of 13th International Symposium on Advanced Science and Technology in Experimental Mechanics F01061 2018年10月

Experimental study on gas-liquid Taylor flow in rectangular microchannels 国際誌

Hiroki Tsubouchi, Ryo Kurimoto, Hisato Minagawa, Takahiro Yasuda

Proceedings of 13th International Symposium on Advanced Science and Technology in Experimental Mechanics F02071 2018年10月

Effect of the Reynolds Number on the Performance of a NACA0012 Wing with Leading Edge Protuberance at Low Reynolds Numbers 査読国際誌

Takahiro Yasuda, Keita Fukui, Keiji Matsuo, Hisato Minagawa & Ryo Kurimoto

Flow, Turbulence and Combustion 2018年9月

Pressure drop and void fraction of gas-liquid Taylor flow in square Taylor flow in square microchannel 国際誌

Ryo Kurimoto, Yusuke Deguchi, Hisato Minagawa, Takahiro Yasuda

Proceedings of 8th European-Japanese Two-Phase Flow Group Meeting 22 - 26 2018年4月

Void fraction and pressure drop measurement of gas-liquid slug flow in square microchannels 査読国際誌

Ryo Kurimoto, Yusuke deguchi, Hisato Minagawa, Takahiro Yasuda

10th International Symposium onMeasurement Techniques for Multiphase Flow ISMTMF ( R001 ) n1 - n2 2017年12月

マイクロバブル水を用いた浸漬洗浄に関する基礎的研究査読

南川久人, 杉本健太, 栗本遼, 安田孝宏

実験力学 17 ( 4 ) 298 - 303 2017年12月

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