Capillary Pressure Curve for Liquid Menisci in a Cubic Assembly of Spherical Particles Below Irreducible Saturation |
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Authors: | Jacob Bear Boris Rubinstein Leonid Fel |
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Institution: | 1.Department of Civil Engineering,Technion,Haifa,Israel;2.Stowers Institute for Medical Research,Kansas City,USA |
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Abstract: | The capillary pressure–saturation relationship, P
c(S
w), is an essential element in modeling two-phase flow in porous media (PM). In most practical cases of interest, this relationship,
for a given PM, is obtained experimentally, due to the irregular shape of the void space. We present the P
c(S
w) curve obtained by basic considerations, albeit for a particular class of regular PM. We analyze the characteristics of the
various segments of the capillary pressure curve. The main features are the behavior of the P
c(S
w) curve as the wetting-fluid saturation approaches zero, and as this saturation is increased beyond a certain critical value.
We show that under certain conditions (contact angle, distance between spheres, and saturation), the value of the capillary
pressure may change sign. |
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Keywords: | |
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