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LaTeX Math Block
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k_f = \mu_f \frac{| {\bf v}|}{ | \nabla p |}

where

LaTeX Math Inline
body\mu_f

fluid viscosity

LaTeX Math Inline
body| {\bf v}|

fluid velocity

LaTeX Math Inline
body\nabla p

pressure gradient



As definition suggests the value of permeability depends on the fluid type type