Search Results - "Takagaki, Naohisa"

Mechanism of drag coefficient saturation at strong wind speeds by Takagaki, Naohisa, Komori, Satoru, Suzuki, Naoya, Iwano, Koji, Kurose, Ryoichi

“…Previous studies have demonstrated the saturation of drag coefficients at strong wind speeds. But the mechanism behind this saturation has not yet been fully…”
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Effects of air-side freestream turbulence on the development of air–liquid surface waves by Takagaki, Naohisa, Suzuki, Naoya, Takahata, Shunsaku, Kumamaru, Hiroshige

“…It is important to investigate the effects of air-side freestream turbulence on the development of air–liquid surface waves. Two turbulent-grid air flows are…”
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Liquid-liquid interfacial instability model for boiling refrigerant transition by pool boiling of immiscible mixtures by Kawanami, Osamu, Matsuhiro, Kazuki, Hara, Yasuhiko, Honda, Itsuro, Takagaki, Naohisa

“…•Pool boiling using immiscible mixtures composed of more-volatile liquid with higher density and less-volatile liquid with lower density is investigated.•The…”
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Strong correlation between the drag coefficient and the shape of the wind sea spectrum over a broad range of wind speeds by Takagaki, Naohisa, Komori, Satoru, Suzuki, Naoya, Iwano, Koji, Kuramoto, Takenori, Shimada, Satoshi, Kurose, Ryoichi, Takahashi, Keiko

“…Momentum transfer across the wind‐driven breaking air‐water interface under strong wind conditions was experimentally investigated using a high‐speed wind‐wave…”
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Air–water mass transfer mechanism due to the impingement of a single liquid drop on the air–water interface by Takagaki, Naohisa, Komori, Satoru

“…•The vortex rings induced by drop impingement renew the water surface.•The vortex rings convect the dissolved CO2 gas from the water surface to the…”
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Mass transfer velocity across the breaking air-water interface at extremely high wind speeds by Iwano, Koji, Takagaki, Naohisa, Kurose, Ryoichi, Komori, Satoru

“…Mass transfer velocity k L across the wind-driven air-water interface was estimated at extremely high wind speeds (up to U 10 =70 m s −1 ) in a high-speed…”
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Laboratory measurements of an equilibrium-range constant for wind waves at extremely high wind speeds by Takagaki, Naohisa, Takane, Keita, Kumamaru, Hiroshige, Suzuki, Naoya, Komori, Satoru

“…•The dominant velocity parameters for the equilibrium-range constant are investigated.•Three wind velocities correlate with the equilibrium-range…”
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Effects of rainfall on mass transfer across the air-water interface by Takagaki, Naohisa, Komori, Satoru

“…The effects of rainfall on mass transfer across the air‐water interface and turbulent structure were investigated through laboratory experiments in a turbulent…”
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Effects of current on wind waves in strong winds by Takagaki, Naohisa, Suzuki, Naoya, Troitskaya, Yuliya, Tanaka, Chiaki, Kandaurov, Alexander, Vdovin, Maxim

“…It is important to investigate the effects of current on wind waves, called the Doppler shift, at both normal and extremely high wind speeds. Three different…”
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A Laboratory Study of the Effect of Surface Waves on Heat and Momentum Transfer at High Wind Speeds by Troitskaya, Yuliya, Sergeev, Daniil, Vdovin, Maksim, Kandaurov, Alexander, Ermakova, Olga, Takagaki, Naohisa

“…This paper describes laboratory experiments (using a high‐speed wind‐wave flume) of the effects of water waves on heat and momentum exchange in the near‐water…”
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Relationship between momentum of an impinging drop and intensities of vortex rings generated below free surface by Takagaki, Naohisa, Kurose, Ryoichi, Baba, Yuya, Nakajima, Yuichiro, Komori, Satoru

“…•DNS with a Level-Set method is applied to a drop impingement.•Vortex rings are generated due to a vertical impingement.•A vortex ring and tube are generated…”
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Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer) by Osamu KAWANAMI, Yasuhiko HARA, Naohisa TAKAGAKI, Itsuro HONDA

“…Boiling heat transfer using immiscible liquid mixtures is an innovative cooling technique for high-heat-density electronic devices. Immiscible liquid mixtures…”
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Development of an optical imaging technique for particle number density by Naohisa TAKAGAKI, Koji IWANO, Emil ILYASOV, Satoru KOMORI, Yoshiyuki SHIRAKAWA

“…Accurate measurements of particle number density along with particle diameters and velocities are strongly required both in academic and industrial fields. A…”
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Subgrid scale scalar variance in high-Schmidt-number turbulence by Kurose, Ryoichi, Takagaki, Naohisa, Michioka, Takenobu, Kohno, Naoki, Komori, Satoru

“…The subgrid scale (SGS) variance for a high‐Schmidt‐number passive scalar of Sc >> 1 is measured using a high‐resolution planar laser‐induced fluorescence…”
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Expanded polytetrafluoroethylene conduits with curved and handsewn bileaflet designs for right ventricular outflow tract reconstruction by Matsushima, Shunsuke, Matsuhisa, Hironori, Wakita, Kohki, Tsujimoto, Takanori, Takagaki, Naohisa, Honda, Itsuro, Oshima, Yoshihiro, Kawanami, Osamu, Okada, Kenji

“…This study reviewed the application of curved and bileaflet designs to pulmonary expanded polytetrafluoroethylene conduits with diameters of 10 to 16 mm and…”
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Estimation of High-Speed Liquid-Jet Velocity Using a Pyro Jet Injector by Takagaki, Naohisa, Kitaguchi, Toru, Iwayama, Masashi, Shinoda, Atsushi, Kumamaru, Hiroshige, Honda, Itsuro

“…The high-speed liquid-jet velocity achieved using an injector strongly depends on the piston motion, physical property of the liquid, and container shape of…”
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Air-sea gas exchange at wind speeds up to 85 m s.sup.-1 by Krall, Kerstin E, Smith, Andrew W, Takagaki, Naohisa, Jähne, Bernd

“…Gas transfer velocities were measured in two high-speed wind-wave tanks (Kyoto University and the SUSTAIN facility, RSMAS, University of Miami) using fresh…”
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Effect of Schmidt number on mass transfer across a sheared gas-liquid interface in a wind-driven turbulence by Takagaki, Naohisa, Kurose, Ryoichi, Kimura, Atsushi, Komori, Satoru

“…The mass transfer across a sheared gas-liquid interface strongly depends on the Schmidt number. Here we investigate the relationship between mass transfer…”
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Air–sea gas exchange at wind speeds up to 85 m s −1 by Krall, Kerstin E., Smith, Andrew W., Takagaki, Naohisa, Jähne, Bernd

“…Gas transfer velocities were measured in two high-speed wind-wave tanks (Kyoto University and the SUSTAIN facility, RSMAS, University of Miami) using fresh…”
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Estimation of the global air–sea CO2 gas flux considering wave breaking by Suzuki, Naoya, Donelan, Mark A., Komori, Satoru, Takagaki, Naohisa

“…We propose a new model with microbreaking and linear dependence on wind speed in the whitecap-free area and linear dependence on the fractional area of…”
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