Modelling of two-phase flow in porous media including non-equilibrium capillary pressure effects

Cas Berentsen, Majid Hassanizadeh & Cas Berentsen
Two-phase flow models commonly use equilibrium capillary-pressure relations. However, in core-flow experiments the time needed to reach capillary equilibrium is already in the order of days. Some recently developed theories [1],[2] account for non-equilibrium capillary pressure at the (upscaled) macro-scale, by proposing that capillary pressure is a function of saturation rate. There is plenty of experimental evidence on the significance of non-equilibrium effects in unsaturated media. However, there are very few experiments dealing with two-phase...
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