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-   -   how to obtain permeability factor of porous media? (https://www.cfd-online.com/Forums/fluent/28371-how-obtain-permeability-factor-porous-media.html)

 sean March 28, 2001 01:30

how to obtain permeability factor of porous media?

I am modeling a laminar gas flow through porous media. The fluent manual said that the porous media may reduces to Darcy's law, and I do not have to define the inertial resistance factor, C_2. However, I still do not know how to define the permeability, alph.

 Mel March 28, 2001 10:04

Re: how to obtain permeability factor of porous me

Sean:

Alpha is the inverse of the permeability. To obtain an estimation of the permeability tensor, you need to know the porosity of the porous media. Also, the unit vector direction is important.

Mel

 sean March 28, 2001 10:16

Re: how to obtain permeability factor of porous me

Mel: You are so kind to give me an answer. Do you mean that I can deduce the viscous resistance coefficient, which is the inverse of the permeability, from the porosity of the porous media in a vector direction? Fluent manual told me that porosity is the volume fraction of fluid within the porous region.

sean

 Mel March 28, 2001 13:05

Re: how to obtain permeability factor of porous me

Sean:

The permeability is a tensor, you need a magnitude and two direction to specify the permeability. The permeability is a function of the porosity, i.e. pore volume fraction.

Mel

 vittal October 25, 2011 01:25

porous media

Can any one help me out how to calculate permeability and C2 if i know porosity.I am unable to know how the unit directions are mentioned.