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moienfar-CFD February 28, 2013 12:18

Heat transfer/Temperature along a tube and probe.
1 Attachment(s)

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.

diamondx February 28, 2013 14:33

If the wall zone has a fluid or solid region on each side, it is called a “two-sided wall”. When you read a mesh with this type of wall zone into ANSYS FLUENT, a “shadow” zone will automatically be created so that each side of the wall is a distinct wall zone. Note that this shadow zone will not be relevant if you then go on to apply shell conduction to the thin wall. In the Wall dialog box, the shadow zone’s name will be shown in the Shadow Face Zone field. You can choose to specify different thermal conditions on each zone, or to couple the two zones:
To couple the two sides of the wall, select the Coupled option under Thermal Conditions. (This option will appear in the Wall dialog box only when the wall is a two-sided wall.) No additional thermal boundary conditions are required, because the solver will calculate heat transfer directly from the solution in the adjacent cells. You can, however, specify the material type, wall thickness, and heat generation rate for thin-wall thermal resistance calculations, as described above. Note that the resistance parameters you set for one side of the wall will automatically be assigned to its shadow wall zone. Specifying the heat generation rate inside the wall is useful if, for example, you are modeling printed circuit boards where you know the electrical power dissipated in the circuits but not the heat flux or wall temperature.

moienfar-CFD March 4, 2013 12:22

Thank you Ali,
It works. Appreciate your help.
Do you know Fluent can simulate solid deformation (structural analysis)?
In order to do structural analysis are there any other options, besides FSI?

Thank you.

diamondx March 4, 2013 12:24

no fluent cannot do structural deformation. there is a way to couple fluid anlaysis and structural analysis using workbench...

moienfar-CFD March 4, 2013 12:29

Thank you.
I thought there might be an easier way (all in fluent).

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