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Published in Soil Sci Soc Am J 44:1168-1173 (1980)
© 1980 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Coupling Phenomena in Saturated Homo-ionic Montmorillonite: IV. The Dispersion Coefficient1

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

ABSTRACT

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.

NOTES

1 Contribution from the Dep. of Land Resource Science, Univ. of Guelph, Guelph, Ontario, Canada. The authors acknowledge support from the National Research Council of Canada.

2 Professional Associate, Professor, and Graduate Student, respectively. The present address of the last author is Dep. of Soil Sci., Univ. of Ghana, Legon, Ghana.

Received for publication January 11, 1980. Accepted for publication June 24, 1980.






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