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Old   May 24, 2007, 12:06
Default wall heat flux
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rosol
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Hi,

is the value of wall heat flux given directly by fluent true if not how to calculate it and how to calculate the heat transfer coefficeint (h)

thanks alot
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Old   May 24, 2007, 17:43
Default Re: wall heat flux
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AJ
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Calculate heat transfer coefficcient as following: htc = q" / ( Tsurf - Tavg)

Tsurf: Surface temperature Tavg: average fluid temperature q": Wall heat flux

You could also compute htc directly from Fluent report:

The Surface Integrals panel can also be used to generate a report of averaged heat transfer coefficient h on a surface:

Report --> Surface Integrals... In the Surface Integrals panel, choose Area-Weighted Average for Report Type, select Surface Heat Transfer Coef. (in the Wall Fluxes... category) as the Field Variable, and select the surface. You have to use average fluid temperature to calculate the heat transfer coeffcient....

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Old   May 25, 2007, 11:15
Default Re: wall heat flux
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rosol
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my question is the value of heat flux given directly bt fluent is its value is correct since when I calculate the heat flux from q=h*(Tw-Tm) the value is differ from the value get from fluent
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Old   May 27, 2007, 16:15
Default Re: wall heat flux
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Bo
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Make sure to check the reference values used by FLUENT to calculate HF. The default temperature is 288.15K. See report->reference..
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