Abstract
Heat transfer mechanism across the sheared air-water interface was investigated in a wind-wave tank. Heat transfer coefficient on the water side was measured through evaporation experiments and water surface temperature was measured using an infrared imaging technique. The results show that the heat transfer coefficient on the water side increases with free-stream wind-speed but it has a kink in the middle wind-speed region. This indicates that the conventional assumption that the heat flux across the air-sea interface is in proportional to the wind-speed is not acceptable. The heat transfer coefficient on the water side also increases in proportion to the frequency of the appearance of surface-renewal events in the whole wind-speed region. This suggests that heat transfer across the sheared air-water interface in wind-driven turbulence is dominated by surface-renewal events just below the air-water interface.
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