@wikipedia
A measure of ability of a porous formation to allow a certain fluid to pass through it.
For the laminar flow:
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| k = \mu \cdot \frac{| {\bf v}|}{ | \nabla p |} |
where
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Permeability depends on fluid type, filling the porous media and the fluid type which is sweeping through it which leads to splitting its value into a product of two components:
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k = k_a \cdot k_r |
where
In general case, permeability is anisotropic both in vertical and lateral directions and quantified by symmetric tensor value:
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If not mentioned otherwise the permeability usually means absolute horizontal permeability:
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body | k = k_h = \sqrt{k_x^2+k_y^2} |
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.
See also
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Natural Science / Physics / Fluid Dynamics / Percolation
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