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Heat transfer under oscillating flow through porous media |
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February 5, 2015, 08:05 |
Heat transfer under oscillating flow through porous media
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#1 |
Member
Join Date: Feb 2011
Posts: 62
Rep Power: 15 |
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 |
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February 5, 2015, 11:37 |
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#2 |
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Vishnu
Join Date: Jan 2015
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I am doing a similar work on thermoacoustic refrigerator. How do you create a low freq oscillation. Can you please explain.
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February 5, 2015, 17:03 |
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#3 |
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Join Date: Feb 2011
Posts: 62
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I introduced sinusoidal functions with the desired frequencies as user defined velocities at both ends. They had different signs, but same magnitudes.
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February 10, 2015, 03:37 |
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#4 |
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Join Date: Feb 2011
Posts: 62
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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? |
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April 22, 2015, 00:49 |
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#5 |
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