CAPILLARY PRESSURE - UPC
CAPILLARY PRESSURE - UPC
CAPILLARY PRESSURE - UPC
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Daniel Fernàndez Garcia<br />
<strong>UPC</strong> – Constitutive eqs.<br />
LEVERETT J-FUNCTION (1941)<br />
The p c -S-relations in NAPL-water or gas-NAPL systems differ from<br />
gas-water due to the interdependence of the interfacial tension and<br />
the contact angle<br />
Dimensionless form of the p c -S-relations<br />
Leverett (1941)<br />
Richardson (1961)<br />
J(S)<br />
J(S)<br />
Pc<br />
= κ / φ<br />
σ<br />
= Pc<br />
κ φ<br />
f ( θ)<br />
σ<br />
/<br />
Influence of contact angle not negligible for drainage or wetting<br />
processes with θ =35-40 or 15-25, respectively.<br />
Contact angle increases with decreasing surface tension so that it is<br />
possible to estimate a range for σ (not negligible for < 50 mN/m)<br />
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