Relative permeability
= Relative permeability
{title2=$k_{ri}(s)$}
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 $Kk_{ri}$, and its <phase mobility> is $k_{ri}/\mu_i$. It depends on saturation and pore-scale phase configuration; it is not the magnetic use of relative permeability.