Capillary rise equation, In his paper from 1921 Washburn applies Poiseuille's Law for fluid motion in a circular tube. Capillary Rise (h): The calculator returns the rise in millimeters. Clear steps explain results for lab and field use. Capillary Liquid Rise and Fall in Tube Equations and Calculator. Capillary Rise Capillary rise is one of the most well-known and vivid illustrations of capillarity. It is exploited in a number of biological processes, including drinking strategies of insects, birds and bats and plays an important role in a number of geophysical settings, including flow in porous media such as soil or sand. When the lower end of a narrow capillary tube is immersed in a liquid, the liquid inside the tube rises a little above the level of the liquid outside. The effect plays a crucial role in diverse scientific and engineering fields. Jurin's law, or capillary rise, is the simplest analysis of capillary action —the induced motion of liquids in small channels [1] —and states that the maximum height of a liquid in a capillary tube is inversely proportional to the tube's diameter. Rise or fall of liquid in a capillary tube (or in porous media) is caused by surface tension and depends on the relative magnitudes of the cohesion of the liquid and the adhesion of the liquid to the walls of the containing vessel.
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