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Evolution of temperature along a fine tube

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Hello,


I would like to see the evolution of the temperature in a steel tube (about 1 mm diameter).
I used the physic "non-isothermal flow" laminar.
My boundary conditions are 7bars input and 1 bar output.
The outside temperature (and initial temperature) is 25 ° C (298.15 K).

Due to the pressure drop along the tube, there should be a temperature loss.
Because of friction, there could be an increase in temperature.
Using a stainless steel tube, maybe the temperature of the outside air also plays a role during the flow.


I tried various boundary conditions (thermal insulation on the wall, heat flux, and convective heat flux). But I have no change in temperature at all, giving the impression that the flow is perfectly isothermal.

What can you advise me so that?

I could use some advice as to how I could observe the actual temperature along the tube.

Thank you in advance for your help,

Best Regards

Cyrielle Morlet


0 Replies Last Post 03.07.2015, 10:35 GMT-4
COMSOL Moderator

Hello Cyrielle Morlet

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