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

Re: Thermal conductivity in porous media
 

If it's steady-state, just use the porsity weighted conductivity.

Jeff

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

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

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