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Anisotropic thermal conductivity in an insulated stranded coil

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Old   April 4, 2011, 05:17
Cool Anisotropic thermal conductivity in an insulated stranded coil
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Hi CFX users,

I'm modeling an electromotor inner fluid domain including the heat source solid domains. The main problem is that there are little air gaps between the copper conductors (little circles nearby) and they are insulated by varnish. So towards the conductors the heat transfer coefficient is about the value of the copper, but in the orthogonal directions it is reduced because of the air gaps and the insulation.

My first idea is to write to the support to help me how to model the anisotropic thermal conductivity via CCL commands as I read in other topics here.

But I'm interested in your other suggestions about the modelling of this problem.

Thanks in advance,
Attila

Last edited by Attesz; April 4, 2011 at 07:47.
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Old   April 4, 2011, 09:46
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Contact support.

This can be done by modifying the material properties in CEL. The limitation is that the orthotropic material properties must be aligned with either the Global Cartisian Coord System, or Global Cylindrical System, so your body has to be aligned right and be of a geometry allows this limitation.
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Old   April 4, 2011, 10:27
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Thanks Edmund, fortunately my geometry is aligned with the GCS, I thought that this is necessary. I'm waiting for the support.

On the other hand, am I right with the approach of the modelling?
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Old   April 4, 2011, 10:36
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No idea.

I am not clearly picturing what you are trying to model. If you are just determining an HTC to use as a BC, then I wouldnt think you need to use ortho props at all.

On the other hand, if you are trying to model thermal gradients within the solid domain, then perhaps yes.
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Old   April 4, 2011, 11:08
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Quote:
On the other hand, if you are trying to model thermal gradients within the solid domain, then perhaps yes.
Yes, I'm trying to model this. Thanks!
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