Heat transfer coefficient(urgent)

gaojixian

Hi all:

I use the software CFX-5.5 to calculate the heat transfer coefficient of the wall. but I meet severe difficulty .

My question is as follows. In the pipe , the fliud is in laminar flow, when the heat boundary is fully developed, when the wall temperature is constant, the Nusselt numuber is 3.66 ; when the wall heat flux is constant, the Nusselt number is 4.36 .

I try and try ,but not to find how to calculate the heat transfer coefficent. To use the definition ,the body fluid tempetature does not to know; the integrated average temperature is not to know yet .the wall temperature gradient is also not to know . Can anyone help me? I was greatly acknoledged!

your fiend

2003.5.9