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natural convection in a vertical tube

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Old   January 30, 2012, 09:22
Default natural convection in a vertical tube
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Hello All;

I'm trying to model natural convection in a vertical tube. A fixed heat flux is applied to the duct. And duct is isolated with glass wool. Ambient air is entering the tube from the bottom and exit from the upper side by heated. Can someone tell me which boundary conditions should i use for inlet and outlet air?

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