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convective heat transfer, how?

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Old   August 14, 2010, 08:19
Default convective heat transfer, how?
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Steffen Heidrich
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Hi,

what I am trying to do is model heat transfer in air gaps. Example a double glazed window, different temperatures both sides. What can Ansys do, and how? Tried CFX, but could not work out how to assign the temperatures to the boundary surfaces.

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Steffen
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Old   August 16, 2010, 12:57
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Neil Duffy
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Hi Steffen,

I assume you are talking about Fluent as both CFX and Fluent are now part of ANSYS. In CFX, to set a temperature to a boundary condition (BC) go to insert-boundary (It will also appear on the toolbar as a box with 2 arrows). You'll need to set your BC to a "wall". you should then be able to specify temperatures, emmisivities etc.

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Neil
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Old   August 17, 2010, 06:04
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Steffen Heidrich
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seems its just surface properties you can assign for the wall....
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Old   October 21, 2010, 12:06
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That's right, if you are just doing CFD, then it will only allow you to assign values to the boundaries.

It sounds like you are interested in a conjugate heat transfer problem. In that case, you would need to like a Thermal analysis to CFX. Then the temperature of the solid-liquid interface becomes part of the solution. Temperatures or heat fluxes can be applied to the boundaries of the fluid and solid regions.
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Old   October 22, 2010, 05:20
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Steffen Heidrich
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its just, could not find, how to assign temperatures in Ansys. Only surface roughness and velocities. What I am trying to do is natural convection, different temperatures both sides of the air gap and this will start to make the air move. Then see how it behaves with different thicknesses of the air gap.
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Old   October 22, 2010, 10:15
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Michael P. Owen
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If you can't see where to assign boundary temperatures it's because you are using an Isothermal energy equation. Switch it to Thermal Energy on the Fluid Models tab of the Domain definition.
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Old   October 25, 2010, 05:42
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Steffen Heidrich
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seems to work, thanks! Found a tutorial on boundary conditions in the www...
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