Search Results - "Kunugi, Tomoaki"

Analytical consideration of liquid droplet impingement on solid surfaces by Yonemoto, Yukihiro, Kunugi, Tomoaki

“…In industrial applications involving spray-cooling, combustion, and so on, prediction of the maximum spreading diameter of a droplet impinging on a solid…”
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Predicting the splash of a droplet impinging on solid substrates by Yonemoto, Yukihiro, Tashiro, Kanta, Shimizu, Kazuki, Kunugi, Tomoaki

“…The impingement behaviours of droplets towards solid substrates depend on the liquid properties, impingement velocity and solid surface conditions, such as…”
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Multi-dimensional characteristics of upward bubbly flows in a vertical large-size square channel by Sun, Haomin, Kunugi, Tomoaki, Yokomine, Takehiko, Shen, Xiuzhong, Hibiki, Takashi

“…•Upward bubbly flow characteristics through flow development are experimentally studied in a large-size square channel.•Local void fraction, axial gas and…”
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Theoretical scaling law for predicting evaporation rate from meniscus by Soma, Shu, Kunugi, Tomoaki

“…•Measurement of evaporation rates of water in various gaps limited by diffusion.•Clarifying dependence of the quantities on perimeters and curvatures of…”
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Wettability model for water-ethanol binary mixture droplet on roughened low-surface-energy solids by Yonemoto, Yukihiro, Tomimitsu, Issei, Shimizu, Kazuki, Kunugi, Tomoaki

“…•The analytical model to predict the wettability on roughened solid surface was developed.•Adsorption of liquid molecules at the solid-liquid interface was…”
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Visualization study on bubble dynamical behavior in subcooled flow boiling under various subcooling degree and flowrates by Cao, Yang, Kawara, Zensaku, Yokomine, Takehiko, Kunugi, Tomoaki

“…•Images of bubble in subcooled flow boiling were observed with high spatial and temporal resolutions.•Bubble behavior characteristics at various subcooling…”
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Direct numerical simulation of liquid metal free-surface turbulent flows imposed on wall-normal magnetic field by Yamamoto, Yoshinobu, Kunugi, Tomoaki

“…•We succeeded in establishing DNS database of turbulent free surface flows imposed on a wall-normal uniform magnetic field.•The modeling of MHD effects on the…”
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Experimental and theoretical investigation of contact-angle variation for water–ethanol mixture droplets on a low-surface-energy solid by Yonemoto, Yukihiro, Kunugi, Tomoaki

“…[Display omitted] •Wettability of water–ethanol mixture droplets was investigated.•Volume-change processes of high ethanol concentration droplets were…”
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Relationship between Onset of Sliding Behavior and Size of Droplet on Inclined Solid Substrate by Yonemoto, Yukihiro, Fujii, Yosuke, Sugino, Yoshiki, Kunugi, Tomoaki

“…Whether a droplet slides or not on inclined solid surface is mainly influenced by a balance between the adhesion force at contact area and the gravitational…”
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A high-precision calculation method for interface normal and curvature on an unstructured grid by Ito, Kei, Kunugi, Tomoaki, Ohno, Shuji, Kamide, Hideki, Ohshima, Hiroyuki

“…In the volume-of-fluid algorithm, the calculations of the interface normal and curvature are crucially important for accurately simulating interfacial flows…”
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Viscoelastic fluid behaviors around a rising bubble via a new method of mesh deformation tracking by Imaizumi, Yuya, Kunugi, Tomoaki, Yokomine, Takehiko, Kawara, Zensaku

“…The deformation of a hydrogen microbubble line and/or mesh in a viscoelastic fluid around a rising bubble was tracked from the original static position in…”
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Modeling of MHD turbulent heat transfer in channel flows imposed wall-normal magnetic fields under the various Prandtl number fluids by Yamamoto, Yoshinobu, Kunugi, Tomoaki

“…•We show the applicability to predict the heat transfer imposed on a uniform wall-normal magnetic field by means of the zero-equation heat transfer…”
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A volume-conservative PLIC algorithm on three-dimensional fully unstructured meshes by Ito, Kei, Kunugi, Tomoaki, Ohshima, Hiroyuki, Kawamura, Takumi

“…•We develop a fully volume-conservative PLIC algorithm on unstructured meshes.•Highly-accurate simulations can be done even on low-quality unstructured…”
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Experimental Correlation for Splashing Condition of Droplets on Solid Substrates by Yonemoto, Yukihiro, Tashiro, Kanta, Yamashita, Minori, Kunugi, Tomoaki

“…Droplet splashing behaviors of water-ethanol binary mixture liquids on roughened solid surfaces were experimentally observed in order to investigate the…”
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Direct numerical simulation of MHD heat transfer in high Reynolds number turbulent channel flows for Prandtl number of 25 by Yamamoto, Yoshinobu, Kunugi, Tomoaki

“…•For the first time, the MHD heat transfer DNS database corresponding to the typical nondimensional parameters of the fusion blanket design using molten salt,…”
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Theoretical Model of Droplet Wettability on a Low-Surface-Energy Solid under the Influence of Gravity by Yonemoto, Yukihiro, Kunugi, Tomoaki

“…The wettability of droplets on a low surface energy solid is evaluated experimentally and theoretically. Water-ethanol binary mixture drops of several volumes…”
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Upward air-water bubbly flow characteristics in a vertical square duct by Sun, Haomin, Kunugi, Tomoaki, Shen, Xiuzhong, Wu, Dazhuan, Nakamura, Hideo

“…In nuclear engineering fields, gas-liquid bubbly flows exist in channels with various shape and size cross-sections. Although many experiments have been…”
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Japanese activities of the R&D on silicon carbide composites in the broader approach period and beyond by Nozawa, Takashi, Ozawa, Kazumi, Park, ChangHo, Park, Joon-Soo, Kohyama, Akira, Hasegawa, Akira, Nogami, Shuhei, Hinoki, Tatsuya, Kondo, Sosuke, Yano, Toyohiko, Shibayama, Tamaki, Tsuchiya, Bun, Shikama, Tatsuo, Nagata, Shinji, Tanaka, Teruya, Iwakiri, Hirotomo, Yamamoto, Yasushi, Konishi, Satoshi, Kasada, Ryuta, Kondo, Masatoshi, Kunugi, Tomoaki, Yokomine, Takehiko, Ueki, Yoshitaka, Okubo, Nariaki, Taguchi, Tomitsugu, Tanigawa, Hiroyasu

“…The R&D on SiC/SiC composites under the broader approach (BA) activities between Japan and the EU for fusion DEMO developed a fundamental database of…”
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Discussion on heat transfer correlation in turbulent channel flow imposed wall-normal magnetic field by Yamamoto, Yoshinobu, Kunugi, Tomoaki

“…Heat transfer degradation in high Prandtl number fluid was evaluated via direct numerical simulation (DNS). Target flow fields were fully developed turbulent…”
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Turbulence modulation of the upward turbulent bubbly flow in vertical ducts by Zhang, Hongna, Yokomine, Takehiko, Kunugi, Tomoaki

“…The present paper aims at improving the modeling of turbulence for the upward turbulent bubbly flow through the use of experimental databases that contain data…”
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