What are the differences between capillary pressure and interfacial tension in the context of multiphase flow in porous media? I understand that capillary pressure is the pressure at the interface between two phases in contact. Then what precisely is the interfacial tension?
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Hi Ankita
Interfacial tension is the work (J or N.m) that is required to increase the surface area of an interface between two phases, expressed per unit surface area (m2). The units of interfacial tension is therefore J/m2, or N/m.
Given two immiscible liquids in a thin tube, capillary pressure is the difference in pressure accross the boundary between the two phases. It results from the interfacial tension between the two phases.
All the best
Johan
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