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March 2, 2011, 23:46 
Airfoil Average Nusselt Number calculation

#1 
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Hi everyone my current version of ANSYS Fluent is 12.1
The type of flow I am using is a Spalart Allarmaras Model Please correct me if I am wrong Now, I wantwant to calculate an average nusselt number from the Solution so do I just simply click "monitor" > " Surface Monitor" Report Type: Integral Field Variable: Wall Fluxes, Surface Nusselt Number?? and also how do I calculate the Reynolds number of the flow as well ? Thanks =) 

March 3, 2011, 01:25 

#2 
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I have the Nusselt Number Distribution around the airfoil
does the Nu Distribution look like that ? and how do I average them ? just add them all and divide by the number of point, n ??? ps: this airfoil is a unit length airfoil Thanks 

March 3, 2011, 03:41 

#3 
Senior Member

Hi,
before computing Nu No., be sure that your reference values are correct.(report>reference values) I think for evaluating average Nu No., you can compute total heat transfer from airfoil and then obtain an equivalent h(heat transfer coefficient) and then compute Nu.(just a suggestion) 

March 3, 2011, 04:47 

#4  
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Quote:
as far as obtaining equivalent h from total heat transfer... what delta temperature should I use ?? ( Temperature varies along the chord length too) Thanks, 

March 3, 2011, 05:21 

#5 
Senior Member

I think it's a good idea to use dT=(TaveTinf). you can obtain Tave from report>surface integral>average facet. isn't it?


March 3, 2011, 06:45 

#6  
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Quote:
h_avg = overall_heat_transfer_rate / ( T_avg  T_fluid ) Nu_avg = h_avg * chord_length / k_fluid correct me if I am wrong 

March 3, 2011, 08:37 

#7 
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