PERMEABILITY OF THIN RANDOM-MEDIA

We present the results of calculations, using cellular automata, of th e particle flow through a porous material. In our model the material i s made of n (equal 4 to 12) layers of the same density. Each layer is independently constructed of interacting monomers and dimers. We estim ate the dependence of permeability on the porosity of the medium, its structure, and the external force speeding up the flow. We also estima te the range of the parameters for which the relation between the perm eability and the porosity is linear. We show that the structure of the layers and the external field have stronger effect for sparse and thi n barriers than for thick and dense material.