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convection from an isothermal horizontal cylinder

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Old   April 19, 2011, 12:27
Default convection from an isothermal horizontal cylinder
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I have a question about heat transfer from an isothermal horizontal cylinder placed in porous media. I am wondering why flow in the vertical direction, and formation of the plume produces higher Nusselt number than if the flow was in the horizontal direction?
does it do with the gravitational acceleration?
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