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December 21, 2012, 04:00 |
How to find Mean Nusselt Number?
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#1 |
New Member
Abhishek
Join Date: Dec 2012
Posts: 1
Rep Power: 0 |
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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December 22, 2012, 03:24 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,747
Rep Power: 66 |
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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December 12, 2016, 08:21 |
hi
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#3 | |
New Member
Djamila
Join Date: May 2016
Location: Algeria
Posts: 16
Rep Power: 10 |
Quote:
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December 12, 2016, 10:50 |
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#4 |
New Member
a0407
Join Date: Aug 2016
Posts: 10
Rep Power: 10 |
Hi, u need to precribed the bulk temperature and characteristic length in the reference value in order to calculate the Nusselt number.
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December 12, 2016, 15:15 |
i already did
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#5 | |
New Member
Djamila
Join Date: May 2016
Location: Algeria
Posts: 16
Rep Power: 10 |
Quote:
but my Question is what means length in CFD when you use 3dpp. My problem is in three dimensional length is it the hydraulics Diameter |
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