THE EFFECT OF A PHASE-TRANSITION ON THE BOUNDARY-CONDITIONS FOR RAREFIED-GASES

The entropy production at the interface between a liquid and a binary vapour-gas mixture is calculated using a phenomenological approach. Th e consideration is confined to the case of the mixture flow over a sli ghtly curved surface, the radius of curvature of which is much greater than the mean free path of the gas molecules. The presence, close to the interface, of kinetic boundary layers in which mass, momentum and energy transfer occurs is borne in mind. Using the entropy production obtained a system of phenomological equations is constructed for the s calar, vector and tensor surface fluxes and forces. New effects which arise from the non-equilibrium thermodynamics relations obtained are d iscussed. (C) 1997 Elsevier Science Ltd.