Nusselt number error in pipe

milad653279 · July 23, 2016, 05:42

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

rapierrz · July 23, 2016, 10:58

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

July 23, 2016, 05:42	Nusselt number error in pipe	#1
milad653279 Member Milad Setareh Join Date: Oct 2012 Location: Tehran, Iran Posts: 35 Rep Power: 14	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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July 23, 2016, 10:58		#2
rapierrz Senior Member Hesam Join Date: Feb 2015 Posts: 139 Rep Power: 11	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