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Sci Rep. 2016 Nov 14;6:37059. doi: 10.1038/srep37059.

Effect of Schmidt number on mass transfer across a sheared gas-liquid interface in a wind-driven turbulence.

Author information

1
Department of Mechanical Engineering, University of Hyogo, Himeji 671-2280, Japan.
2
Department of Mechanical Engineering and Science, Kyoto University, Kyoto 615-8540, Japan.
3
Research Center for Highly-Functional Nanoparticles, Doshisha University, Kyotanabe 610-0394, Japan.
4
Center for Earth Information Science and Technology (CEIST), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, 236-0001, Japan.

Abstract

The mass transfer across a sheared gas-liquid interface strongly depends on the Schmidt number. Here we investigate the relationship between mass transfer coefficient on the liquid side, kL, and Schmidt number, Sc, in the wide range of 0.7 ≤ Sc ≤ 1000. We apply a three-dimensional semi direct numerical simulation (SEMI-DNS), in which the mass transfer is solved based on an approximated deconvolution model (ADM) scheme, to wind-driven turbulence with mass transfer across a sheared wind-driven wavy gas-liquid interface. In order to capture the deforming gas-liquid interface, an arbitrary Lagrangian-Eulerian (ALE) method is employed. Our results show that similar to the case for flat gas-liquid interfaces, kL for the wind-driven wavy gas-liquid interface is generally proportional to Sc-0.5, and can be roughly estimated by the surface divergence model. This trend is endorsed by the fact that the mass transfer across the gas-liquid interface is controlled mainly by streamwise vortices on the liquid side even for the wind-driven turbulence under the conditions of low wind velocities without wave breaking.

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