Abstract
On the basis of a cylindrical pore model, the estimation correlation for determining permeability in a Knudsen flow regime kF by using that in a continum flow regime kV was empirically investigated.
Assuming that the kF values of porous media having the same kV values are also the same, the relationship between kF/kV and equivalent pore radius re for any given porous media was converted to that of a packed bed with spherical particles.
The expression mentioned above fitted the data cited from the literature for porous media with a uniform structure or with a structure similar to that of a cylinder, accurately enough for practical usage.
