[Diana.N]

Hello everyone.
I have one problem related to heat transfer forced convection.
Problem statement: pipe ( 1.5m length & 1inch diameter) is heated under constant heat flux.


I simulated it in fluent and I got the unsatisfactory results .



My Calculation sample in fluent is;
1. Create iso- surfaces on the surface of cylinder (0,0.3,0.6……etc.).


2 calculate the Nusselt number for each surface using FLUENT parameters as follows:


Nu = qp Di/ ((Ts - Tb)Kf
where
qp = Heat flux at specified surface (Report--- Surface integral------area weighted average).
Di = inside diameter of pipe
Ts = Temperature of surface
Tb = Bulk temperature of fluid at the out let of the surface (Report- Surface integral--mass weighted average).
K = Thermal conductivity of fluid.


3- The result as compared with correlation are not satisfied.


I don’t know if there is a mistake in my procedure can anyone help me please.

With regards


Diana.N