Hello all,
I am trying to do heat transfer simulation that involves a hot plate(surface/body) and a cold plate, separated by an air filled cavity.
The setup looks like in the below picture:
I am running a simulation considering the following features:
type : internal
* heat conduction in solids
* time dependent 120 seconds with 1 second increments
* gravity
The fluid of choice here is air.
Bodies are by default Stainless Steel 321.
Default wall condition is heat transfer coefficient of about 35 W/m^2/K and temperature of external fluid 293.2 K and roughness 0 micrometer.
First, I set up the fluid sub-domain, the air inside the cavity.
I then set up body 1 as a volume heat generation and set it to 20 000 W.
I assume that the walls have their default condition but I have also set them up with heat transfer coefficient individually towards the same result.
The results I am getting are the following:
The heat transfers to the walls in the top region as well as the air inside which heats up. HOWEVER.. the air does not seem to transfer any heat anywhere. It seems that the heat is only from the heat generator towards the bodies/fluids it comes DIRECTLY in contact with.
What I need is to see how the heat transfers from heat generator -> air -> cold plate.
Any suggestions on how to do that? Is there something I am assuming or doing wrong?
Thank you for your time and attention. Looking forward to hearing your advice and learn from it.
Best regards,
Dan
First of all, I would not use a default heat transfer flux on all the walls, unless you know for a fact (derived experimentally) that is the case in this scenario. You chose a very specific number as well, where does that number come from?
As for the air, use the geometry check tool and click "show fluid" to make sure you have air where you think you have air. You mention a subdomain, but this is an internal flow problem with only 1 domain, so there might be some confusion here.
What boundary condition do you want to apply to the side walls of this cavity? Are they adiabatic or constant temperature? How do they interact with the energy transfer between the hot/cold plates?