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-   -   wall heat flux (http://www.cfd-online.com/Forums/fluent/44806-wall-heat-flux.html)

rosol May 24, 2007 12:06

wall heat flux
 
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

AJ May 24, 2007 17:43

Re: wall heat flux
 
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....


rosol May 25, 2007 11:15

Re: wall heat flux
 
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

Bo May 27, 2007 16:15

Re: wall heat flux
 
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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