|February 4, 2010, 08:46||
problem with constant wall heat flux
Join Date: Dec 2009
Posts: 46Rep Power: 8
i want to use a fixed heat flux boundary condition in a conjugate heat transfer problem i use fixedGradient boundary condition on T ;
gradient uniform 10.417;
i know that
heatflux = thermal conductivity (k) * tempreature gradient (dT/dN)
so for k=12 , heatflux=125 w/m2 >> gradient=heatflux/k=10.417
please help me ,, is that right to describe my constant heat flux (125 w/m2) in OpenFOAM ..
thank you very much ..
|June 23, 2014, 14:23||
Join Date: May 2014
Posts: 6Rep Power: 4
hello, i am trying to set up something similar where i have a constant heat flux.
in my case i have lamps heating up air in a room.
my question is: would k be a property of the air? or of the lamp
|June 24, 2014, 03:07||
Join Date: Oct 2013
Posts: 14Rep Power: 4
It depends on where you are fixing the heat flux. If you have simulated the lamp then you use the conductivity of the lamp. If you haven't simulated the lamp then you have to calculate the convective heat transfer coefficient (hc) or you can fix a HeatFlux boundary condition.
Last edited by Barbara; June 24, 2014 at 03:08. Reason: lexical mistake
|July 16, 2014, 08:30||
multiregion solid conduction
Join Date: Mar 2009
Posts: 32Rep Power: 9
I am also trying to do something similar and the option to fix the Gradient of T works fine but only if you have solids with the same k (thermal conductivity). If there are different domains with different k's the results are not as expected comparing with COMSOL or FLUENT applying the actual heat flux boundary value.
Has anyone dealt with something like this in ChtMultiRegionFoam if yes any advice would be really helpful!!!
Thanks in advance
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