| Popis: |
An equation relating modified threshold pressure, interfacial tension, contact angle and porosity is developed for packs of uniform spheres. On the basis of this equation a method is developed for determining contact angles or wettability from laboratory data. The method calls for careful discrimination between the strictly drainage and pseudo-drainage cases. It may be extended to more general cases and applied to threshold pressure data obtained using Bartell's cells, mercury penetration data or conventional capillary pressure curves, and yields realistic values of contact angle. |
