Fluent Help
 

Hi, Currently I am working on Solar Collector based project. I am a beginner in fluent and I am wondering how to put heat flux boundary condition only on inner surface of the conical copper coil( I do not mean the inner wall of tube). I have attached the image of the conical copper coil.

For that you need to define that surface/part a separate surface in the geometry/meshing section, so that this surface should be selected(separated from the rest of the geometry) while defining the boundary conditions.