It may lose its entire effect towards permeability at high temperature as the gas viscosity
is a strong function of temperature.
where [mu] is the dynamic gas viscosity
and [kappa] is the absolute permeability of the porous medium.
s) 5.8x[10.sup.-4] Strata gas viscosity
, [[mu].sub.g] (Pa.
In this article, therefore, the kinetic theory of granular flows (KTGF) is still used to close the viscosity and pressure of the solid phase, neglecting the effects of structure on the stress tensor, and the gas viscosity
is assumed to be constant.
These results correlate well with the regularity patterns of turbine meter error variation in case of gas viscosity
change from pressure  (Fig.
The dilute gas viscosity
can be well presented by the Chapman-Enskog approximation derived from the kinetic theory:
Factors such as gas viscosity
or density or gas temperature can increase turbulent flow and may cause a-linear results.
The fourth, gas viscosity
, is fairly small compared to the rest, so it doesn't go into most equations that are used to predict the occurrence of gas defects.
They explained the trend as resulting from decreasing gas density and increasing gas viscosity
, with interparticle effects neglected.
It should be noted that the viscous dissipation term in Eq 36 is set to zero for the gas domain, since the gas viscosity
is very low.
From Poiseuille's law for laminar flow, the pressure drop is a function of gas viscosity
. Therefore, the splitting ratio becomes a function of viscosity, which in turn is dependent on gas species, temperature, and pressure.
where L is the thickness of the membrane, z is the dimensionless distance through the membrane, P is the total pressure inside the membrane, T is the temperature, xi is the mole fraction inside the membrane, DiK is the Knudsen diffusivity, Dij is the binary gas diffusivity, r is the pore radius, and u i is the gas viscosity