気液界面での気体交換を支配する乱流長さスケールについて(波浪・砕波・水表面での気体輸送(1),一般講演)

概要

論文の詳細を見る
Lengthscales of turbulent motions controlling the air-water gas transfer are investigated experimentally in grid-stirred turbulence. The CO_2 absorption process is observed using laser-induced fluorescence technique (LIF). Also, surface-renewal eddies are visualized by means of particle tracking velocimetery (PTV). It is seen from the measurements that surface-renewal motions may be characterized by both the integral lengthscale and the Taylor microscale. We obtain normalized vertical profiles of the dissolved CO_2 concentration and turbulent quantities such as the turbulent intensity and the dissipation rate of the turbulent energy. The experimental data for the air-water interface without breaking support linear relations between the thickness of the dissolved gas boundary layer and the Batchelor scale, while in the case for the interfacial breaking, the boundary layer thickness decreases rapidly with decrease of the Batchelor scale, the behavior of which is similar to that for wind-generated turbulence.
2007-08-06