C212 気液界面における高シュミット数乱流物質輸送に対するスプラッティング効果(C-21 乱流熱物質移動および反応流(3),一般講演)

概要

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Numerical simulation of high Schmidt number turbulent mass transfer across a contaminated air-water interface is carried out via a hybrid DNS/LES scheme. By introducing two time scales, i.e., penetration time scale T_P and renewal time scale T_R, it is found that the upwelling at the interface, i.e., splatting which satisfies T_R>T_P penetrates the concentration boundary layer and contributes to the mass transfer. The most striking effects of surfactants are the dumping of the irrotational motion at the interface and the associated drastic reduction of the gas transfer rate. The gas transfer rate is quantitatively predicted by the surface divergence induced by the splatting which penetrates the surface layer. At highly contaminated interfaces, the interfacial penetration hardly occurs and the gas transfer rate is converged to that at a solid wall, indicating that the mechanism of the interfacial mass transfer is changed to that near a solid wall.
日本流体力学会の論文
2004-08-09