毛管流による自然排水特性について

概要

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In order to study the draining of water from a vessel by means of capillary rise, experiments were carried out by using two kinds of capillary bundles. One was a packed column of glass beads or silica sands. The other was a bundle of cotton fibers (sterilized gauze) having no column wall. It was obtained experimentally that the rate of draining Q by capillary flow was given as follows : (1) In a packed column with a glass wall, Q can be calculated by Kozeny-Carman's Eq.(2) in H_x<h_d. (2) In a bundle of gauze without a column wall, Q is proportional to the head difference Δh and inversely proportional to L', which is the length of a bundle exposed to the air. This is because the draining through the bundle depends on the water surface. (3) In both cases, Q decreases with increasing the height of capillaries H_x except the lower H_x, due to the decrease of water saturation in the bundles by capillary rise. As a result, it is suggested that it is possible to drain a supernatant liquid during settling in a sedimentation tank by means of capillary flow in the bundle without a column wall.
社団法人日本材料学会の論文
1978-07-15