2834 風波気液界面を通しての物質輸送に及ぼす気泡の巻き込みと温度成層の効果

概要

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Effects of bubbles entrained into water by wave breaking and thermal stratification on the mass transfer across wind-driven air-water interface were experimentally investigated. The bubble entrainment rate and relative velocity between bubbles and liquid were measured using both a laser Doppler velocimeter (LDV) and a phase Doppler anemometry (PDA), and the mass transfer velocity from bubbles was estimated. The results show that the contribution of the bubbles to the total mass transfer across breaking air-water interface is at most 7%. The frequency of appearance of surface renewal eddies and the heat transfer coefficient were measured using both a LDV and a cold wire connected to a constant-current temperature bridge. The results show that the thermal stratification beneath the interface does not affect the scalar transfer across the wind-driven air-water interface.
2000-07-31