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Capillary Pressure




In Fluid Statics , capillary pressure is the difference in Pressure across the interface between two immiscible Fluid s.
The pressure difference is proportional to the Surface Tension , \gamma, and inversely proportional to the effective radius, r, of the interface, it also depends on the Wetting Angle , heta, of the liquid on the surface of the capillary.
:p_c= rac{2\gamma \cos heta}{r}

The capillary pressure p_cis defined as
:p_c=p_g-p_w
for the case of one phase being gas with pressure p_g and the other phase being water with pressure p_w.

The equation for capillary pressure is only valid under capillary equilibrium, which means that there can not be any flowing phases.


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