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January 14, 2012, 12:29 
Local heat transfer coefficient around a cylinder

#1 
New Member
Benjamin
Join Date: Jan 2012
Posts: 1
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Hello,
I'm trying to get the local Nusselt number around one cylinder in an external air flow. (http://siam51.free.fr/air_flow.bmp) The mesh is fine enough to have y+~1 near the wall. I got the total temperature near the wall, the heat flux near the wall (W/mē) and the total heat flux exchanged (W) To calculate the local heat transfer coefficient, I tried two methods : h1 = [ heat flux near the wall (W/mē) ] / (383263) h2 = [ total heat flux exchanged (W) ] / (383total temperature near the wall) Values are completely different! h1~50450 h2~250600 I wonder what would be the best formula to use? Thanks in advance! 

January 20, 2012, 14:23 

#2  
Senior Member
Join Date: Jun 2011
Posts: 115
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You have to use static temperature in your calculation not the total temperature.
Quote:


March 29, 2013, 14:35 

#3  
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elham usefi
Join Date: Mar 2013
Location: iran
Posts: 1
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Quote:
i have the same problem! but i have a problem in calculating the local heat transfer around the cylinder! should i choose some points by surfacepointcoordinate?i think cartesian coordinate isn't accurate! plz help me! thanks in advance! 

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