[kartrmswy]

Hi,

I'm trying to do a single-phase flow analysis of a pipe-in-pipe heat exchanger - I'm having some trouble with the wall BCs.

I've managed to make the walls conducting (which means there is effective heat transfer happening between the fluids in the annulus and the inner pipe) - but I'm not sure if FLUENT (14.5) is accounting for the resistivity of my steel pipe (interface between the two fluids).

I did a 3D simulation after meshing it on ICEM (the WB mesh had some issues) and obtained a temperature profile at the outlet (attached) that agrees with the fluids but is constant inside the solid. I expected a linear drop within the solid: Any way I can solve this issue?

Edit: To be clear, the region from 0 to 0.0094 is fluid 1 and the flat region of the curve (0.0094 to 0.0131) is the solid wall. This is a radial temperature profile of Laminar flow.

Thanks and looking forward to your comments!