Does Permeabilities of a porus media differ with different gases?

[fang54]

I have a porous media(sintered SiC) filter material tested with N2 gas flow to get the P-Q curve and Darcy number(Permeability, k) calculated. P-Q Curve look linear, and thus flow is laminar and with Darcy's law.

However, we now is thinking of running Hydrogen gas through the media. So, Is that Darcy Number(Permeability) remains valid with a different gas? and thus my P-Q curve would scale with the dynamic viscosity of the fluid?

 

[IRstuff]

This paper seems to answer the question

https://www.mdpi.com/2077-0375/10/1/11

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[pierreick]

HI,
You may want to take a look at the paper attached in the link:

https://www.researchgate.net/publication/301091623_The_Permeation_of_Gases_Through_Solids

Pierre

 

[1503-44]

If you are within the transition flow ranges D'ARCY flow is not linear.
Inertial flow of H2 would be quite different from N2.
There are several forms that D'ARCY can take to account for deviations.
On the developments of Darcy's law to include inertial and slip effects

https://www.sciencedirect.com/science/article/pii/S1631072117300979

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."