Heat transfer under oscillating flow through porous media
 

Hello everyone,

I am having some issues with my 2D axisymmetric model. I am trying to get a constant temperature average on a heated pipe interior wall exposed to oscillating flow.

Imagine a long pipe with porous region covering 1/7 of the pipe in the middle. The wall of the porous part is heated by introducing constant heat flux. The fluid, water in this case, is oscillated with a low frequency. The domain is also cooled down through the remaining surface.

However, the cooling cannot set a balance and the wall temperature keeps increasing even though the axial temperature gradient right outside the foam is extremely high.

I have been using RNG k-epsilon with enhanced wall treatment (y+ around 0.8) and PISO as the pressure-velocity coupling.

I think that the mixing is not effective enough. Is there an option you would recommend mixing-related? Or is there any detail that needs to be known about solving convection-diffusion problems with Fluent.

I would appreciate any kind of help.

Thank you

I am doing a similar work on thermoacoustic refrigerator. How do you create a low freq oscillation. Can you please explain.

I introduced sinusoidal functions with the desired frequencies as user defined velocities at both ends. They had different signs, but same magnitudes.

Could anyone point me to a viable finite volume study on oscillatory heat transfer? Because I haven't found a solution so far.
And, is there a way to save the hydrodynamic data at each time step in order to avoid calculation every oscillation cycle so that fluent will only solve the energy equations?

Hey,
have you got the answer,