風波気液界面を通しての熱移動と物質移動の相似性

概要

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The frequency of appearance of the surface-renewal eddies below a wind-driven air-water interface in a wind-wave tank was measured to discuss the effects of liquid viscosity on the heat and mass transfer across the air-water interface. The restilts show that the convertable relation which represents the proportionality between the mass transfer coefficient and Sc^<-1/2> is incorrect in the wind-driven field, since the frequency of the surface-renewal eddies controlling heat and mass transfer is independent of the liquid kinematic viscosity. Furthermore, the heat transfer coefficient on the liquid side was measured for the air-water interface in the wind-wave tank. The results show that the conventional bulk method for estimating the heat flux at the air-water interface is not reliable. The similarity between heat and mass transfer at the air-water interface can be seen in the high wind speed region where the effects of the tiny surface-active impurities on the molecular diffusivity at the interface are removed by intense wave-breaking. However, the similarity disappears in the lower wind speed region. The damping effect of the surface active impurities on the heat transfer is larger than that on the mass transfer.
社団法人日本機械学会の論文
1999-06-25