Transport in Porous Media

, Volume 39, Issue 2, pp 187–225

Macroscale Thermodynamics and the Chemical Potential for Swelling Porous Media


  • Lynn Schreyer Bennethum
    • Department of Mathematics
  • Márcio A. Murad
    • Department of Mathematics
  • John H. Cushman
    • Department of Mathematics

DOI: 10.1023/A:1006661330427

Cite this article as:
Bennethum, L.S., Murad, M.A. & Cushman, J.H. Transport in Porous Media (2000) 39: 187. doi:10.1023/A:1006661330427


The thermodynamical relations for a two-phase, N-constituent, swelling porous medium are derived using a hybridization of averaging and the mixture-theoretic approach of Bowen. Examples of such media include 2-1 lattice clays and lyophilic polymers. A novel, scalar definition for the macroscale chemical potential for porous media is introduced, and it is shown how the properties of this chemical potential can be derived by slightly expanding the usual Coleman and Noll approach for exploiting the entropy inequality to obtain near-equilibrium results. The relationship between this novel scalar chemical potential and the tensorial chemical potential of Bowen is discussed. The tensorial chemical potential may be discontinuous between the solid and fluid phases at equilibrium; a result in clear contrast to Gibbsian theories. It is shown that the macroscopic scalar chemical potential is completely analogous with the Gibbsian chemical potential. The relation between the two potentials is illustrated in three examples.

macroscalechemical potentialmixture theoryporous mediaswelling porous media

Copyright information

© Kluwer Academic Publishers 2000