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Conjugate Heat Transfer, Duct Boundary Conditions?

Posted 2011年6月9日 GMT+2 21:09Heat Transfer & Phase ChangeVersion 3.5a1 Reply

Matthew Williamson
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I have successfully modeled forced convection over a heat sink. I have a known inlet temperature and velocity. I have run into problems when I add a duct geometry about the heat sink and air. My first question is about the boundary conditions on the outside of the duct. At first, I used a fixed temperature equal to the ambient temperature. I believe that is causing a cooler solution than reality. My next attempt was to use surface-to-ambient radiation on the exterior of the duct with a know emissivity and ambient temperature.

I have not yet found an acceptable solution with this method. Does there need to be a know medium outside the duct to radiate to?

Thanks for your help
1 Reply Last Post 2011年7月21日 GMT+2 14:11
COMSOL Moderator

Hello Matthew Williamson

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Yaseen Al Waaly
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Posted: 1 decade ago 2011年7月21日 GMT+2 14:11
Hi there,
You can convective flux as a boundary condition.
Hi there, You can convective flux as a boundary condition.

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