The present study aims at contributing to the development of the theory of surface evaporation phenomena from porous-capillary bodies. A mathematical model is described for unsteady-state processes in bodies of non-uniform pore distribution as well as for those of steady state in the case of uniform pore distribution.
The model is developed also for the solution of heat and mass transfer problems of surface evaporation for both kinds of porous media mentioned above. Also, values of the principal physical parameters are determined, and those of the transport coefficients during the course of the heat and mass transfer process.