Hi @nayakvr,
the full-blown simulation requires a coupling between the fluid and solid reason which is unfortunately not yet available (but we’re working on it 
)
To me this looks like this problem is best solved with solid mechanics. You can assume a convective heat transfer boundary condition at the inside of the pipe. Therefore you have to estimate a heat transfer coefficient for the this interface. Additionally you just need a sensible boundary condition for the outside of your pipe and you’re set.
This should give you a sensible radial temperature distribution across your pipe. In axial direction however, it will not change (think of it as a 3D problem which degenerates into 2D under these assumptions). If you want to achieve this, you have to do a fluid simulation as well, as outlined by @dheiny.
Hannes