Heat transfer trough an internal wall

anke · March 5, 2010, 02:14

Hello,

I'm looking for a possibility to model the following problem.
I have an internal wall between to rooms. There is no pressure and velocity exchange between the rooms, only heat transfer.

The wall can be modulated with zero-thickness.

thr solver shoul be buoyantSimpleRadiationFoam because I have a Radiation source in one room.

I'm not sure If a have to define the the internal wall as patch and how the initial conditions , especially for the Temparture should look like.

Greetings

Anke

David_010 · March 5, 2010, 05:24

Hi anke

I think you should create a wall with thickness, defined as solid, with the appropriate thermal conductivity. Then the heat flux between the two rooms will be calculated. I think you can't fix it through a boundary condition. I don't have experience with turbulent models and I don't know if you need to specify the heat transfer coeff on the walls, but I think this is the correct way at least for laminar.

I hope it help you

Regards

David

anke · March 5, 2010, 05:32

Hello David,

thanks for your help.
If I use a wall with thickness, do I have to use the chtMultiRegionFoam-Solver?

That would be a Problem, because this solver does not have a Radiationmodel.

Greetings

Anke

David_010 · March 5, 2010, 05:57

Hi anke

Yes I think that is the appropriate solver, because if the difference of temperature between rooms is important, the conduction equation must be solvet on the wall. If you need the radiation model, may be you can add it to the chtMultiRegionalFoam but Im not able to help you in this way. On the other hand, if you consider that the heat flux between rooms is negligible, you can fix the zeroGradient condition for the temperature on the walls.

Sorry for not being more help.

Regars

David

March 5, 2010, 02:14	Heat transfer trough an internal wall	#1
anke New Member Anke Join Date: Mar 2009 Location: Germany Posts: 9 Rep Power: 17	Hello, I'm looking for a possibility to model the following problem. I have an internal wall between to rooms. There is no pressure and velocity exchange between the rooms, only heat transfer. The wall can be modulated with zero-thickness. thr solver shoul be buoyantSimpleRadiationFoam because I have a Radiation source in one room. I'm not sure If a have to define the the internal wall as patch and how the initial conditions , especially for the Temparture should look like. Greetings Anke

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March 5, 2010, 05:24		#2
David_010 Member David Join Date: Dec 2009 Location: Spain Posts: 62 Rep Power: 16	Hi anke I think you should create a wall with thickness, defined as solid, with the appropriate thermal conductivity. Then the heat flux between the two rooms will be calculated. I think you can't fix it through a boundary condition. I don't have experience with turbulent models and I don't know if you need to specify the heat transfer coeff on the walls, but I think this is the correct way at least for laminar. I hope it help you Regards David

March 5, 2010, 05:32		#3
anke New Member Anke Join Date: Mar 2009 Location: Germany Posts: 9 Rep Power: 17	Hello David, thanks for your help. If I use a wall with thickness, do I have to use the chtMultiRegionFoam-Solver? That would be a Problem, because this solver does not have a Radiationmodel. Greetings Anke

March 5, 2010, 05:57		#4
David_010 Member David Join Date: Dec 2009 Location: Spain Posts: 62 Rep Power: 16	Hi anke Yes I think that is the appropriate solver, because if the difference of temperature between rooms is important, the conduction equation must be solvet on the wall. If you need the radiation model, may be you can add it to the chtMultiRegionalFoam but Im not able to help you in this way. On the other hand, if you consider that the heat flux between rooms is negligible, you can fix the zeroGradient condition for the temperature on the walls. Sorry for not being more help. Regars David