Turbulent heat transfer

January 8, 2007, 08:07

Hi.

I'm stuggling to get correct heat transfer using the k-e model.

I'm trying to model heat transfer from fluid to a wall, using the k-e model, for a cylinder in a cross-flow. I've got y+ values in the range 30-300 as the good book suggests, but still the Nussult numbers are ten times higher than those suggested by an experimental correlation (Churchill & Bernstein, J Heat Trans. 99:300). Is there another criterion that I have to meet to make sure heat transfer is coorect? Anyone had similar experience? HELP!!!

Thanks, Hugo.

January 8, 2007, 11:57

Hi!

Are your reference values set correctly???

Ralf

January 11, 2007, 10:34

Yes, got it wrapped up - should have been calculating my own Nusselt numbers, not relying on the values that Fluent was putting out. Thanks, Hugh.

January 8, 2007, 08:07	Turbulent heat transfer	#1
Hugo Guest Posts: n/a	Hi. I'm stuggling to get correct heat transfer using the k-e model. I'm trying to model heat transfer from fluid to a wall, using the k-e model, for a cylinder in a cross-flow. I've got y+ values in the range 30-300 as the good book suggests, but still the Nussult numbers are ten times higher than those suggested by an experimental correlation (Churchill & Bernstein, J Heat Trans. 99:300). Is there another criterion that I have to meet to make sure heat transfer is coorect? Anyone had similar experience? HELP!!! Thanks, Hugo.

January 8, 2007, 11:57	Re: Turbulent heat transfer	#2
Ralf Schmidt Guest Posts: n/a	Hi! Are your reference values set correctly??? Ralf

January 11, 2007, 10:34	Re: Turbulent heat transfer	#3
Hugo Guest Posts: n/a	Yes, got it wrapped up - should have been calculating my own Nusselt numbers, not relying on the values that Fluent was putting out. Thanks, Hugh.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Water subcooled boiling	Attesz	CFX	7	January 5, 2013 04:32
Heat transfer BC at wall- why need wall thickness?	Julie	FLUENT	7	February 3, 2012 22:41
empirical formula on turbulent heat transfer	zhhuang	FLUENT	0	March 3, 2003 01:34
Heat Transfer Coeff. at Heat Flux Boundary	Rushyen	CFX	6	January 18, 2001 06:09
Heat transfer coefficent in turbulent flow	Ola Lindgren	Main CFD Forum	2	November 17, 1998 06:49