Some Remarks on the Permeability of Fluid in Pores -Deviation from D'Arcy's Law in a Low Flow Region-

Abstract

According to the theoretical prediction of D'Arcy's and Poiseulle's law, the flow rate of fluid in pores must be directly proportional to the pressure difference across the bed or tube within the laminar flow region. However, the experimental results show that the extrapolation of the plots of flow rate against pressure difference does not pass through the origin of coordinate, though there exists a linear relation between them. The intersections on abscissa have the value between O.1 and 0.2 g/cms for gas permeation irrespective of the packed material in column, even in case of open capillary tube. Several experimental results and modified formula for permeability are presented.