a question about interface heat transfer
 

I want to make a very simple sample. That two channels divided by a cupper plate, which one is cold water, the other one is hot water. I want to know the temperature field in copper plate and the heat transfer conditions on the interface between water and copper.
I try it, unfortunately, the T in inlet of the tube is the same to the outlet. I don't know why the results.
Thanks for any help.
If who can provide me some materials, especially the moderling, I will appreciate a lot.