Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

A dependence of the amount of gas passed Q on the input pressure P_in has been derived for turbulent flow in a model material with an artificially prepared porous texture. For the ratio Q/∆P, where ∆P is the pressure gradient equal to the difference of an input P_in and output P_out pressures, the dependence on P_in is linear with a positive slope value, while for Q/∆P² for the pressure gradient expressed by P_in² - P_out² it is linear as well, but with a negative slope value, which contradicts the experimental results. The ratio Q/∆P has been introduced as a quantity determining the permeability. The dependence of permeability on the path length of the flow L satisfied the power function Q/∆P = CL^-b, where the constant C corresponds to the value (Q/∆P)₍₁₎ for L = 1, C is characteristic of a given system. Helium has been chosen as a standard gas for studying gas permeability in real porous systems.

Keywords: Gas permeability; Real porosity; Turbulent flow.

References: 13 live references.