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-   -   Thermal conductivity in porous media (http://www.cfd-online.com/Forums/cfx/20419-thermal-conductivity-porous-media.html)

Andrea June 7, 2004 06:42

Thermal conductivity in porous media
 
I have a gas (water and hydrogen) in a graphite porous media. I suppose that the effective thermal conductivity is greater than the gas thermal coductivity.

How can I model that?

Thanks

Andrea

Jeff June 9, 2004 18:48

Re: Thermal conductivity in porous media
 
If it's steady-state, just use the porsity weighted conductivity.

Jeff

Andrea June 10, 2004 04:52

Re: Thermal conductivity in porous media
 
It is a steady-state, in Cfx 4.4

What did you intend for "porosity weighted conductivity"?

I have to set my gas thermal conductivity like

porosity*gas_therm_cond

or

porosity*gas_therm_cond+(1-porosity)*solid_therm_cond

Thanks

Andrea


Jeff June 11, 2004 12:10

Re: Thermal conductivity in porous media
 
You got it right with the second option. You have to include the effect of the higher conductivity.

Jeff

Taghreed Raho August 5, 2004 16:12

Re: Thermal conductivity in composite materials
 
Dear sir I have gradient ceramic-metal composite materials,I need a suggetion how to test thermal conductivity ( instruments & conditions) I'm will be verry glad to hear from you . Best wishes and regards

Taghreed


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