how to modify thermal conductivity coefficients of gas mixture?

- May 11, 2021 at 5:33 am
  
  Weiqiang Liu
  Subscriber
  
  Hi all,
  I am trying to use UDS to solve a non-equilibrium thermal case of porous media. For the energy equation of gas phase, the thermal conductivity coefficient of mixture is modified as follows:
- May 11, 2021 at 12:49 pm
  
  Karthik Remella
  Administrator
  
  Hello Doesn't this depend on the definition of k_g? In the paper, is it defined as the thermal conductivity of the gas? If so, you can define this in the materials and access it from the macro.
  Karthik
- May 12, 2021 at 1:05 pm
  
  Weiqiang Liu
  Subscriber
  
  Karthik:
  In the energy equation of gas, the term (kg+pg*cg*D) is some kind of lumped thermal conductivity of gas. In other words, kg is like original thermal conductivity. In material panel, I have to use UDF to define this lumped thermal conductivity. Therefore, my question is how can I get this original thermal conductivity? Because surely this kg is not a constant. So my thought is to use kinetic theory to calculate thermal conductivity of every species and then use mass weighted average method to get thermal conductivity of mixture. Does this make any sense?
  Best regards
  weiqiang