heat - Simulation of effect of heated resistance on temperature distribution in laminar flow

Question

I'm new to Comsol and I'm trying to simulate the effect of a metal heater resistance (gold) on a laminar cooling flow (water). I would like to get the stationary temperature distribution in the fluid due to the heating effect of the gold resistance. I'm probably missing some boundary condition since I cannot get my solution to converge.

What I have so far:

• 2D axisymmetric geometry
• Non-Isothermal Flow, which is a coupling between a laminar flow and heat transfer in fluids.
• inlet boundary condition (flow rate)
• outlet boundary condition (pressure)
• fluid temperature initial condition : room temperature (298.15 K)
• boundary temperature condition for gold resistance (310 K)
• convective heat flux defined with heat transfer coefficient

I attached a screen-shot of the model builder and of my geometry. Does anyone know which boundary conditions may be missing or otherwise why my solution isn't converging?

Thanks!

Geometry

Screenshot of Model Builder

Answer 1

It looks like you have the correct interfaces, assuming your heat flux is constant or definable, but I would have to look at your entire model in order to identify the problem. Not enough information here.

Since you have resistive heating, that can be included as another interface. In this case you would have to include the geometry of the cylindrical wall as well. This would replace your heat flux interface.