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Conjugate Heat Transfer, Duct Boundary Conditions?

Posted Jun 9, 2011, 3:09 p.m. EDT Heat Transfer & Phase Change Version 3.5a 1 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 Jul 21, 2011, 8:11 a.m. EDT
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Hello Matthew Williamson

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Yaseen Al Waaly
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Posted: 1 decade ago Jul 21, 2011, 8:11 a.m. EDT
Hi there,
You can convective flux as a boundary condition.
Hi there, You can convective flux as a boundary condition.

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