Volume average heat transfer coeff.

salihovic · November 14, 2015, 15:02

Dear all,

I am modeling a three dimensional geometry with convective heat transfer.
Flow over a cylinderwhich is at constant temperature.

I wonder what does volume weighted average heat tranfser coeff. mean?

or should I use area-weighted average of heat transfer coeff. over the cylinder?

LuckyTran · November 14, 2015, 16:45

heat transfer coefficient is a surface phenomenon. It really should be some type of surface average.

You shouldn't even be able to calculate a volume average heat transfer coefficient because it's defined only on surfaces. Integrating over a volume of an un-defined quantity is meaningless if not impossible.

November 14, 2015, 15:02	Volume average heat transfer coeff.	#1
salihovic New Member selim Join Date: Sep 2009 Location: UK Posts: 19 Rep Power: 16	Dear all, I am modeling a three dimensional geometry with convective heat transfer. Flow over a cylinderwhich is at constant temperature. I wonder what does volume weighted average heat tranfser coeff. mean? or should I use area-weighted average of heat transfer coeff. over the cylinder?

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November 14, 2015, 16:45		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,679 Rep Power: 66	heat transfer coefficient is a surface phenomenon. It really should be some type of surface average. You shouldn't even be able to calculate a volume average heat transfer coefficient because it's defined only on surfaces. Integrating over a volume of an un-defined quantity is meaningless if not impossible.