# Porous media : simulation of an heat exchanger

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 July 28, 2009, 11:01 Porous media : simulation of an heat exchanger #1 New Member   Arnaud Join Date: Jul 2009 Posts: 6 Rep Power: 9 Hello, I am simulating the cooling down of the air through an heat exchanger. It has aluminium fins. I need that you validate (or not) my thought. I want to put the right pressure drops in the flow direction (Z) and to forbid the flow in the other direction (becaus of the fins). * viscous resistance = f(1/permeability) -> Z : 0 (no material in this direction) -> X,Y : high value to forbid the flow in this direction * inertial resitance = f(pressure loss per unit lenght along the flow direction) -> Z : the coefficient I've calculated to obtain the good pressure drop -> X,Y : 0 (no friction pressure drop in this direction) What do you think about that? Thank you for each answer.

 July 29, 2009, 04:39 #2 New Member   Arnaud Join Date: Jul 2009 Posts: 6 Rep Power: 9 someone has any idea?

 July 29, 2009, 09:28 #3 New Member   wu Join Date: Jul 2009 Posts: 14 Rep Power: 9 About the pressure drop, you are right. The problem is how to treat the heat transfer between the air and the fins.

 July 29, 2009, 09:56 #4 New Member   Arnaud Join Date: Jul 2009 Posts: 6 Rep Power: 9 in fact, I just calculate the temperature exchanges to have the good density, in the aim of having the good pressure drops in my model. I don't seek to have the real temperature. I have one inlet an one outlet. I know that I have 155°C in the inlet and I want 50°C in the outlet. So I've calculated the heat exchange (Q=mCdT) in created a energy source in the porous media.

 July 29, 2009, 10:02 #5 New Member   wu Join Date: Jul 2009 Posts: 14 Rep Power: 9 the pressure drop is dependent on the fluid properties which are dependent on the temperature.

 July 29, 2009, 10:06 #6 New Member   Arnaud Join Date: Jul 2009 Posts: 6 Rep Power: 9 i know. That's why I have implemented a source term. The Temperature depend on the velocity. I meant that the modelization of the temperature exchanges is sufficient with a source term for me (I don't need to develop an udf to be more precise).

 October 19, 2009, 04:45 #7 Member   toto Join Date: Jun 2009 Posts: 71 Rep Power: 9 Hi Arnaud, please witch Solver are you used? Could you send me your case? I would like to simulate an Heat exchanger too, but it don´t work! Thank you in advance

 Tags fluent, heat exchanger, porous media

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