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Nusselt number error in pipe

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Old   July 23, 2016, 05:42
Default Nusselt number error in pipe
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Milad Setareh
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Dear Foamers
I want to calculate Nusselt number in laminar flow in pipe. I know the Nusselt number is 3.66 r in a pipe with fixed temperature.
my velocity profile matchs with theory equations but i reach to 4.012 for the nusselt number and i don't know what is wrong with it.
i use buoyantBoussinesqSimpleFoam solver.
Does anyone know how I can calculate bulk temperature in a pipe?
please help to solve this problem
Regards
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Old   July 23, 2016, 10:58
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Hesam
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Hi milad,

If you want to calculate the bulk temperature in a pipe 2 prosedure can

be used :

1- using integration of variables

2-using of correlation that extracted for laminar flow in pipes according to

this paper:

Experimental investigation into convective heat transfer of nanofluids at the entrance region under laminar flow conditions
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