Finding thermal resistance using average temperature
Finding thermal resistance using average temperature
(OP)
Hey, I have a simple model set up right now that I'm using to verify my process is correct. This will later be extended to analyze finned heat exchangers. My model is a square block of a defined thickness. It has a convection applied to one side. The side of the block that is opposite has a heat flux source in an area 1/10 the size of the block face area. This heat source is centered. All other sides are insulated including the area surrounding the heat source.
The analysis runs fine and my issue is with postprocessing. I'm looking to do a process similar to COMSOL Multiphysics in which you can integrate over a boundary by selecting faces. This integration provides a temperature result in [m^2*K] and a normal heat flux in [W]. I use this integral and divide by the face area to get an average temperature. This is then used to back out the thermal resistance (R=deltaT/Q). The normal heat flux is used to check the energy balance between sides.
I've spoken with some regular users of ANSYS and they believe a similar process can be done in ANSYS but didn't know how. Can anyone help me with integration across a boundary to find an average temperature and back out the thermal resistance? Or is there another way built into ANSYS for finding thermal resistances?
The analysis runs fine and my issue is with postprocessing. I'm looking to do a process similar to COMSOL Multiphysics in which you can integrate over a boundary by selecting faces. This integration provides a temperature result in [m^2*K] and a normal heat flux in [W]. I use this integral and divide by the face area to get an average temperature. This is then used to back out the thermal resistance (R=deltaT/Q). The normal heat flux is used to check the energy balance between sides.
I've spoken with some regular users of ANSYS and they believe a similar process can be done in ANSYS but didn't know how. Can anyone help me with integration across a boundary to find an average temperature and back out the thermal resistance? Or is there another way built into ANSYS for finding thermal resistances?





RE: Finding thermal resistance using average temperature
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RE: Finding thermal resistance using average temperature
RE: Finding thermal resistance using average temperature
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RE: Finding thermal resistance using average temperature
The equivalent procedure in COMSOL Multiphysics is
Postprocessing>>Boundary Integration>>Select Boundary(s)>>Temperature [m^2*K] or Normal Heat Flux [W]
I use this feature to take the integral of the source boundary and divide by the area of the heat source which provides me an average temperature. This average temperature is needed to determine the thermal resistance through the entire block.
Is there a similar feature in ANSYS? I've been told there is by colleagues but it is unknown to them where it is and I have been unable to locate it myself.
RE: Finding thermal resistance using average temperature
RE: Finding thermal resistance using average temperature
RE: Finding thermal resistance using average temperature