SOME CONSIDERATIONS ON MODELING HEAT AND MASS-TRANSFER IN POROUS-MEDIA

In this paper some considerations are presented about the equations ne eded to set up a model of the process of heat and mass transfer in por ous media. A clear classification is made of the various types of equa tions used and of their physical meaning. Special attention is paid to the thermodynamic equilibrium equations and to their derivation since they are too often taken for granted. The importance of the various t ransport mechanisms (of mass and energy) is analyzed and the consequen ces that can arise when some term is neglected are indicated.