Part 1 - Systems with Intensive Interphase Mass Transfer

Abstract

The analysis of the mechanism and kinetics of convective mass transfer in two-phase systems in many cases is often possible, if the velocity distribution is determined in the beginning and then, after its substitution in the equation of convective diffusion, the rate of interphase mass transfer is found. The processes of non-linear mass transfer, heat transfer, and multicomponent mass transfer in gas (liquid)–solid surface systems can be discussed with the help of an example of the longitudinal streaming of a semi-infinite flat plate in the approximations of the boundary layer theory. The non-linear effect is taken into account through the introduction of the velocity of the induced flow at the interface. The interphase mass transfer in the gas–liquid and the liquid–liquid systems is primarily associated with the industrial absorption and extraction processes. The process intensification through the generation of big concentration gradients in gas and liquid leads to the manifestation of non-linear effects in the kinetics of the mass transfer in the gas and liquid phases. In this way, the interphase mass transfer in the gas–liquid and the liquid–liquid systems becomes non-linear. The theoretical investigations of the non-linear mass transfer in gas–liquid systems show that practically the non-linear effects are essential in cases when the diffusion resistances in the gas phase limits the mass transfer rate.