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发表于 2006-4-6 08:29:28
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来自 美国
Re:高手看看,这个问题应该如何分析,谢谢。
BTW,
1.the outer diameter is very small,about 1.2mm--5mm
Is there any difference to the big size of this model?
not clear what you are saying...
or what's more need to be considerd?
2.no nature convection ?
It's the section of a 3Dmodel,
For the 3Dmodel, no nature convection ?
I had thought you want a 2D problem.
What are the boundary conditions at top and bottom sides? The conditions will determine wether you need nature convction.
3.temp of the wire<100C
So the radiation can be negelected, what's your basis?
Should be ignored. you can judge it by calculate the thermal resistance for both air conduction and radiation, even assuming e=1.
Compare to 'thermal conduction' , since the thermal conductivity of the air is very small, can the radiation be negelected? |
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