風波気液界面を通しての物質移動に及ぼす吹送距離の影響(流体工学,流体機械)

概要

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The effects of fetch on mass transfer across the wind-driven air-water interface was investigated through laboratory experiments in a large wind-wave tank. The CO_2 transfer coefficient on the liquid-side, k_L, was measured by applying the flux-profile method to the vertical distributions of wind velocity and CO_2 concentration in air. The surface-renewal frequency f_s that dominates mass transfer across the air-water interface was measured by applying the VITA method to the streamwise velocity fluctuation in water. The results show that both k_L and f_s are well correlated with free-stream wind velocity U_∞ irrespective of fetch, whereas k_L and f_s are poorly correlated with the velocity at the center of entrance U_C. Furthermore, k_L. measured in both small and large wind-wave tanks is well correlated with U_∞ whereas k_L is poorly correlated with air friction velocity u ^*_a. These results suggest that an outer parameter is a more suitable parameter for correlating k_L.
社団法人日本機械学会の論文
2007-07-25