# Calculation of Heat Transfer coefficient

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 February 14, 2009, 09:50 Calculation of Heat Transfer coefficient #1 sachin Guest   Posts: n/a Hello i am doing a heat transfer analysis of fluid flowing through a sub-channel. Constant heat flux condition is given to the wall. Using Mass flow inlet and Pressure outlet. In postprocessing of CFX there is a parameter "wall heat transfer coefficient". I want to know how is it being calculated in CFX. Actually i am calculating HTC by the following relation q=h*(Ts-Tb) where,q=Heat flux, h=HTC, Ts=surface temp.,Tb=bulk temp. would u plz let me know about the parameter "wall HTC" and whether my way of calculating HTC is right? thank you.

 February 15, 2009, 18:52 Re: Calculation of Heat Transfer coefficient #2 Glenn Horrocks Guest   Posts: n/a Hi, Yes, you calculation is correct - although if you are using radiation modelling you may need to use just the convective wall heat transfer. The calculation of h in CFX is described int he manual in the section describing the turbulence model at the wall (assuming you are using a turbulence model!). In short, CFX calculates a wall heat transfer, then estimates an ambient temperature and calculates h based on that. It does not model h directly. Glenn Horrocks

 February 16, 2009, 03:24 Re: Calculation of Heat Transfer coefficient #3 sachin Guest   Posts: n/a thanks glenn.

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