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How to find Mean Nusselt Number?

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Old   December 21, 2012, 04:00
Default How to find Mean Nusselt Number?
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I am doing an computational analysis on natural convection heat transfer through rectangular fins attached to a wall. After the simulation, Surface Nusselt number for hot wall which I am getting in higher than (twice) the experimental results. The way I am following for finding the mean nusselt number is : Report--> Surface Integrals-->Facet Average-->Wall Fluxes-->Surface Nusselt number.
Please provide me the solution. Also let me know whether I am using the right way of finding the nusselt number or not. If not then please provide me an alternate way of finding the Average Nusselt Number.
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Old   December 22, 2012, 03:24
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Two things:

1) Heat transfer coefficient needs a reference temperature
2) Nusselt number needs a reference length scale.

Both of these reference quantities are specified on the reference values task pane. Did you remember to specify them?

I have always used area-weighted average and not facet average, but I believe they yield similar results. You should be able to get the average Nusselt number the way you are doing.
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