Tensor Darcy law for tissue screens of dense type (Q1082976)

This paper gives a theoretical derivation of equations required to calculate the hydraulic drag of tissue screens of the dense type in an arbitrary direction in a region where Darcy's law holds, i.e., where the pressure drop depends linearly on the velocity of the free stream. The derivation is based on the application to the screens of what is called Happel's cellular porous medium flow model. It should be noted that the cellular model makes it possible to obtain good agreement with experiment for a number of porous materials.