Abstract
The mathematical definition of permeability for orthotropic porous mediums is developed from the assumption that orthotropic porous mediums (i.e., porous mediums that possess three mutually perpendicular planes of structural symmetry) obey Darcy's Law in the three directions normal to the planes of symmetry. This assumption is shown to lead to the conclusion that permeability obeys the transformation law definitive of second‐order tensors; and that consequently a permeability quadric, the Mohr circle representation of transformation of permeability components and permeability invariants, can be defined.

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