[GeorgeL]

Hi,

I'm trying to model a simple flow in a pipe with non-adiabatic walls.
My flow inlet has a set velocity and temperature, and I want to know how much heat is lost to the walls.
Unfortunately, I do not know the thermal B.C. at the walls (surface temperature, heat flux, heat transfer coefficient). All I know about the wall are its thermal properties and thickness.
I cannot assume a thin-wall since the wall thickness is the same as the radius of the flow domain.

Is there anyway to solve this or do I need to know more boundary conditions to properly solve the problem?

Thanks,
George