THE INFLUENCE OF THE DILALATION OF A FLAT INTERFACE ON THE MASS-TRANSFER

The common methods for calculating the mass transfer across liquid-liq uid interfaces in technical applications take into account the mass tr ansfer resistances within the bulk phases. The transfer resistance of the interface and a possible coupling between the momentum and the mas s transport is not taken into account. In the present paper a survey i s given of theoretical approaches which can describe this coupling and the additional mass transfer resistance. A theory is proposed by Hamp e which can be used to explain the coupling between momentum and mass transport employing thermodynamics of irreversible processes. On the b asis of this work, the influence of the dilatation of a flat interface on the mass transfer is deduced. It is also concluded from this theor y that the diffusion coefficients within the bulk phases are coupled n ear the thermodynamic equilibrium.