Porous media : simulation of an heat exchanger
 

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.

someone has any idea?

About the pressure drop, you are right.
The problem is how to treat the heat transfer between the air and the fins.

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.

the pressure drop is dependent on the fluid properties which are dependent on the temperature.

:)

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).

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