A Simple question about Nusselt No.?!

Yalu

Dear All,

I am a new user of Fluent. I need to calculate Average value of Nusselt No. for an internal flow in a pipe with constant heat flux. I have checked the calculation with Report > Surface Integrals> area-weighted average> surface heat transfer coefficient : & Nu=(h*d)/k; using wall average Static Temperature and pipe area and diameter in reference values. But unfortunately the results are so different with literature, especially when changing the Re. No. The length of the pipe is 0.8 m & the diameter is : 0.01m.

Any urgent help would be appreciated.

All the best:Yalu