[Raza Javed]

Hello Everyone,


I am using chtMultiRegionSimpleFoam and my OpenFoam version is 4.1


In my geometry I have two regions (as shown in the attached figure)


specifications of my case:


1. Green region is heater.
2. Blue region is air
3. In the heater region, there is fvOptions with a power of 5W.
4. The air is not moving (frozenFlow=yes), to minimize the effect of convection.
5. In the heater region, I have put the radiation model= opaqueSolid.
6. In the air region, I have put the radiation model = viewFactor.
7. I am following the tutorial chtMultiRegionSimpleFoam/multiRegionHeaterRadiation.


Trying to do:

As due to power on the heater, its temperature would be higher as compared to air, so heat will radiate into the air, the goal is to simulate those radiations to check how fast the heat radiates, and how fast it goes to steady state?

Questions:

1. Are the radiation models which I am using correct? Or do I need to use others?
2. When I remove the radiations from my case, even then I see the same results as with radiations. I don't know why is it like that?
3. What should I expect when I am using radiation? faster heat transfer? or something else?
4. With the case specifications, I mentioned above, when I RUN the case, the temperature of both (heater and air) starts continuously increasing and increasing. I don't know why ? because I am just putting 5W of power, the temperature should not go so high.
5. How can I calculate the temperature of my heater if I have the power dissipation of 5W?


I tried to explain my problem and I shall be very thankful if someone can help.


Thank you