Permeability of porous materials for liquid and gases
1 Joint Institute for High Temperatures of RAS - 13, bldg. 2 Izhorskaya str., Moscow, 125412, Russia
2 Moscow Institute of Physics and Technology - 9, Institutskiy per., Dolgoprudny, Moscow Region, 141700, Russia
Received: 12 September 2014
Accepted: 7 October 2014
It is shown that propagation of liquids and gases through a porous material has a different character, namely, the viscosity characterizes this process for liquids, whereas for gases it is determined by collisions of the gas molecules with the skeleton of the porous material. The analog of the Kozeny-Carman formula in liquids for the Darcy coefficient or the permeability coefficient is represented for gases. The transition between these limiting cases results from the relation between the mean free path of an individual molecule in a liquid or gas λ and the mean free path of this molecule with respect to its scattering on the skeleton of a porous material.
PACS: 47.56.+r – Flows through porous media
© EPLA, 2014