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ISSN オンライン: 2642-0554

HEAT AND MASS TRANSFER ACROSS THE WAVY SHEARED INTERFACE IN WIND-DRIVEN TURBULENCE

Satoru Komori
Department of Mechanical Engineering and Science Kyoto University Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8140, Japan

Ryoichi Kurose
Department of Mechanical Engineering and Science, and Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto 615–8540, Japan

Shuhei Ohstubo
Department of Mechanical Engineering and Science, Advanced Research Institute of Fluid Science and Engineering, Kyoto University Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Kenji Tanno
Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa, 240-0196, Japan

Naoya Suzuki
Department of Mechanical Engineering, Kinki University 3-4-1 Kowakae, Higashi-Osaka, Osaka 557-8502, Japan

要約

Heat and mass transfer mechanism across the sheared air-water interface was both experimentally and numerically investigated. Turbulence structure near the interface was clarified by instantaneous velocity and temperature measurements together with direct numerical simulation of wind-driven turbulence. Heat and mass transfer coefficients on the water side were measured through evaporation and CO2-desorption experiments in small and large wind-wave tanks and their behaviours against wind speed were discussed with turbulence structure near the interface. The results show that both heat and mass transfer coefficients on the water side increase with the free-stream wind speed and they have a small plateau in the middle wind speed region where the streaky flow structure changes to patchy one. The distributions of the mass transfer coefficient against the free-stream wind speed also show no dependency of fetch and they agree with the field measurements plotted against the free-stream wind speed in the atmospheric surface layer. By using the empirical correlations between the transfer coefficients and the free-stream wind speed the global heat and mass transfer exchange rates across the air-sea interface were estimated. The estimation suggests that the global air-sea heat and mass exchange rates are larger than those predicted by conventional models.