The Use of CFD to Simulate Capillary Rise and Comparison to Experimental Data

In a micro-gravity environment liquid can be pumped and positioned by cohesion and adhesion forces. On earth this effect is covered by the hydrostatic pressure, so it can only be observed in very fine tubes (socalled capillaries). The final liquid height depends on the balance of the capillary force and the weight of the liquid that has been lifted up. This paper reports on the CFD simulations performed to simulate the capillary rise of a liquid in a 0.2 mm diameter tube. This model is validated against published experimental data for water arising height vs. time. Good agreement between the CFX results and experimental data has been observed.

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