[moienfar-CFD]

Hi,

We are going to simulate flow and temperature change along a probe inside a tube (see the attached file).
We know temperature and velocity of the flow at inlet. But, in order to assign thermal boundary conditions for the probe and the tube, we need to know any of these conditions: Temperature, convection (heat transfer coefficient and stream temp), or heat flux. Among them we know only heat transfer coefficient. In case of using convection, heat transfer coefficient is known but results depend on the stream temperature, and we dont know stream temperature!
We dont know the temperature along the probe and tube. In fact we need to find them (it is why we are doing the whole simulation).

What should we do? What kind of boundary condition we need to use?
Once again, we dont know neither temperature, nor heat flux along the probe and tube. We know temperature at inlet.

Thank you.