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Miscible Displacement: IV. Mixing in Glass Beads¹

ABSTRACT

A column of 390_µ 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.

¹ Contribution from the Department of Irrigation, University of California, Davis. Presented before Div. I and II, Soil Science Society of America, Nov. 30, 1961, at St. Louis, Mo.

² Assistant Professor and Assistant Irrigationist, respectively.

Received for publication March 5, 1962. Accepted for publication April 30, 1962.