Prediction of turbulent high Schmidt number mass transfer using a low Reynolds number k—ϵ turbulence model

Abstract

Results of computer simulations using a low Reynolds number k—ϵ model by Chien combined with the derived turbulent Schmidt number relationship reveal a good agreement with experimental results over a broad Schmidt and Reynolds number range. The turbulent Schmidt number relationship is derived from spatially resolved measurements of the Reynolds stress −ϱ l u′ v′ and measurements of mass transfer coefficients for high Schmidt number solutes. The computational fluid dynamic approach for the prediction of turbulent high Schmidt number mass transfer would thus also serve as the basis for a tool in cases where the molecular properties such as diffusivity and change in the vicinity of the wall which conventional mass transfer relationships are unable to in a general way. It has also been proven to be capable of handling cases where suction at the wall takes place.