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Soil Science Society of America Journal Abstract -

Coupling Phenomena in Saturated Homo-ionic Montmorillonite: IV. The Dispersion Coefficient1


This article in SSSAJ

  1. Vol. 44 No. 6, p. 1168-1173
    Received: Jan 11, 1980
    Accepted: June 24, 1980

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  1. P. H. Groenevelt,
  2. D. E. Elrick and
  3. K. B. Laryea2



The movement of NaCl through the clay paste examined in this series of articles is analyzed in terms of dispersion and convection. The dispersion coefficient is proven to be velocity independent, i.e. the “hydrodynamic/lateral diffusion” part of the dispersion coefficient is negligible in comparison to the “molecular-diffusion” part.

Subsequently the thermodynamic equations for the salt flux and the liquid flux are reformulated for the condition of zero electric current. The salt flux equation is then further transformed in order to conform with the transport equation for the salt commonly used in dispersion studies, such that one recognizes a dispersion term and a convection term. The dispersion coefficient appears to contain an element due to salt sieving. The convection term appears as the product of the volume flux, the equilibrium salt concentration and a term involving the reflection coefficient.

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