Key points are not available for this paper at this time.
Abstract Numerical solutions to the unaveraged mass balance equation for the case of a flat mobile interface reveal that both high‐ and low‐frequency velocity fluctuations can contribute to mass transfer. This is in contrast to transport to a solid boundary where only low‐frequency fluctuations, normal to the wall, are important. The average mass transfer coefficient is found to depend on Schmidt number to the −0.5 power, in agreement with classical theories. It is related to the velocity field in the liquid primarily through the mean‐square value of the gradient of normal velocity fluctuations at the interface.
McCready et al. (Tue,) studied this question.