A dimensionless reduction of a porous formation's intrinsic permeability of a porous medium for one fluid phase in multiphase flow. Its effective phase permeability is , and its phase mobility is . It depends on saturation and pore-scale phase configuration; it is not the magnetic use of relative permeability.
Relative permeability divided by the phase's dynamic viscosity. In the phase Darcy law, without body forces. Ratios of mobilities determine fractional flow when the phases have a common pressure gradient.
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Relative permeability is a measure of a porous material's ability to transmit fluids compared to a reference fluid, typically water or air. It quantifies the ease with which different fluids can move through a porous medium, such as soil, rock, or a filter cake, under conditions of partial saturation with multiple fluid phases. In the context of multiphase flow, relative permeability is defined for each phase (e.g.