Nusselt number error in pipe
 

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

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