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This article in SSSAJ

  1. Vol. 33 No. 1, p. 25-29
    Received: May 27, 1968
    Accepted: June 11, 1968

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Movement of Water and Salt through a Clay-Water System: Experimental Verification of Onsager Reciprocal Relation1

  1. J. Letey and
  2. W. D. Kemper2



Equations that describe the movement of solution and salt through a soil system in which there are both hydrostatic and osmotic pressure gradients are presented. These equations are: JV = − LPP + LPD ∇π, JD = LDPPLD ∇π, and JS/CS = (−LP + LDP) ∇P + (−LD + LPD) ∇π where JV is the flux of solution, JD the difference in velocity between water and salt, JS is flux of salt, P is pressure, π is osmotic pressure, CS is the average solute concentration, and L is phenomenological coefficients. The Onsager reciprocal relation states that LPD = LDP. This relation was found to be valid for a clay-water-salt system.

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