Abstract
According to Ransohoff and Radke (1988) when a capillary tube with either square or triangular cross section as shown in Fig. 3 is immersed in water, the water advance in the capillary tube up to a distance h, after which the water advances to very1 INRODUCTIONWhen a smooth circular tube of small diameter, d, is immersed in a container with water, the water rises in the tube to a height called the height of capillary rise, h (Fig. 1). The height of capillary rise, h, is easily calculated and is equal to: h = 4Ts cos θ/γwd. In this equation, Ts is the surface tension of the water, θ is the contact angle, and γw is the unit weight of the water. However, pores in soils and rocks are not circular nor smooth but rough. The present study presents a method to calculate the height of capillary rise in tubes with rough walls. The implications of the results of this study are extended to analyze the slaking of shales.
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