Capillary pressure

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Capillary pressure is the difference in pressure across the interface between two immiscible fluids. The pressure difference is proportional to the surface tension and inversely proportional to the effective radius of the interface, it also depends on the wetting angle of the liquid on the surface of the capillary.

P_C=\frac{2\gamma \cos \theta}{r}

where

γ = surface tension

r = capillary radius

θ = wetting angle

The capillary pressure is defined as: PC = PG − PW where PC is capillary pressure,PG is gas pressure,PW is water pressure

[edit] References

Kim Kinoshita, Electrochemical Oxygen Technology p139, John Wiley & Sons, Inc. 1992


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