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Comparison of Liquid Retention Curves with Polar and Nonpolar Liquids¹

ABSTRACT

Capillary pressure-saturation data obtained on unconsolidated porous media containing different clay minerals with different liquids are compared to evaluate the effect of clay-water interactions on liquid retention characteristics. The clay minerals used were a well-crystallized kaolinite, an illite, and a Ca-montmorillonite. The wetting fluids were distilled water and a light hydrocarbon, soltrol, which was assumed not to interact with the clays. The hydraulic variables, capillary pressure and saturation, are transformed to account for differences in contact angle, density, and surface tension of the liquids. The liquid retention functions obtained from the different wetting fluids for the kaolinite samples are statistically similar. For Ca-montmorillonite and illite, the retention functions are statistically different. The explanation for the difference in retention functions for Ca-montmorillonite samples is the swelling that occurs with water. The difference in retention functions for illite samples can be accounted for by an immobile water layer.

¹ Oregon Agric. Exp. Stn. Tech. pap. no., 7210. Contribution of the Dep. of Agric. Eng. and Dep. of Soil Sci., Oregon State Univ., Corvallis, Oregon. This work was supported through an agreement with the National Science Foundation.

² Research Associate, Dep. of Agronomy, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.

³ Professor of Dep. of Agricultural Engineering, Oregon State Univ., Corvallis OR 97331.

Received for publication June 14, 1984. Accepted for publication February 14, 1985.

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