Temperature inside thickness of a tube using ANSYS Fluent
 

Hi

I have a series of tubes branching from a header, where water at 250 deg C flows through the inside and flue gas at 600 deg C outside.The tubes are bent in nature and has a dimension of D60x10mm, and a length of 20 Metre. Some portion of the tube is insulated also. I need to find out the temperature profile inside the thickness of tubes as I want to input them for finding thermal expansion. How to model this problem, and can any one give me a detailed procedure to do the analysis?

I need to know, how to formulate the problem in CFD and the boundary conditions, I need to specify.. Pls send me a tutorial or sample problem