N. V. Pavlyukevich

Heat and mass transfer in porous media

A brief survey of works concerned with transfer processes in porous media is given.

ON THE PROBLEM OF NONISOTHERMAL MASS TRANSFER IN POROUS MEDIA

We propose a model of nonstationary processes of interrelated heat and mass transfer in porous media that takes into account the mutual influence of vapor and liquid pressures determined by the contribution of the capillary and surface forces and temperature on the interphase mass‐transfer intensity, the thermocapillary flows, and the mechanical and dynamic equilibrium conditions of thin layers of liquids on curved interfaces. The results of the numerical solution of the system of equations of heat and mass transfer in capillary‐porous bodies in discrete and continuous heating as well as with allowance for the effect of nonequilibrium of phase transformations have been analyzed.

Mathematical Modeling of Heat and Mass Transfer in Evaporation of a Substance from a Porous Body in Vacuum

A problem of the Stefan type which describes heat and mass transfer in a porous body with the double phase transition liquid–ice–vapor has been formulated and solved.

Escape of a Rarefied Gas into Vacuum through a Nonhomogeneous Porous Layer

Mass transfer in filtration or evaporation of a substance from a deepened surface in a highly porous layer and in escape into vacuum is calculated based on the Monte Carlo method. It is assumed that the porous layer contains individual inclusions in which the porosity is a random quantity. Account is taken of the possibility of the gas molecules being absorbed on the surface of the particles of the porous body. The angular distributions of molecules emerging from the layer are obtained. The nonmonotonic character of the distribution of the molecules absorbed which is caused by the presence of the inclusions is revealed.