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This article in SSSAJ

  1. Vol. 27 No. 1, p. 10-13
    Received: Mar 5, 1962
    Accepted: Apr 30, 1962

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Miscible Displacement: IV. Mixing in Glass Beads1

  1. D. R. Nielsen and
  2. J. W. Biggar2



A column of 390µ glass beads was used in a series of miscible displacement experiments to investigate over a wide range of flow velocities the contributions of diffusion and variations in pore-water velocities to mixing. The two fluids were aqueous solutions of Na2SO4 and NaCl having equal densities and with tritium added to the NaCl. A desired minimum solute-solid interaction was obtained as indicated by the data. It was found that diffusion causes a significant amount of mixing during displacement. An application of the information to the movement of nutrients in the soil moisture stream is discussed.

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