Evaluating heat transfer coefficient for a cylinder

[Laurry]

I'm doing a steady-state thermal analysis for a cylinder geometry.

Inside the cylinder is a heat source and this heat is going to water channel
(modelled with FLUID116 elements) and the air.

For air convection I have to define a heat transfer coefficient which is
dependent on the flow of air around the cylinder.

I'd want to evaluate the HTC analytically and with Ansys CFX.

The cylinder is in a room with known dimensions and the velocity of air
is also known.

1) How do I evaluate HTC analytically? I know I have to calculate
at least Reynolds number and Prandtl number and then Nusselt's number.
After this I'm lost.
2) I have modeled the room with the cylinder in Ansys CFX. Do I somehow
get the HTC as an output from CFX for the elements on the surface of cylinder?

https://www.dropbox.com/s/qxlvtyrtchz46yu/cylinder.JPG

 

[Navin A S]

?dl=0Yes, you can get the heat transfer coefficient from CFX. To do this, you will need to set up a boundary condition on the surface of the cylinder that defines the convective heat transfer coefficient. This can be done by setting the convection coefficient (HTC) under the "Boundary Conditions" tab in the CFX solver. The HTC can then be calculated by the solver and output as an answer.