TAGGED: heat-flux, heat-transfer
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April 19, 2024 at 10:30 amAntónio OliveiraSubscriber
Hi,
I'm having a problem simulating a water heating element. In this case, I have a flow-through water pipe, where a heat flux of 35 W/cm2 is applied to the outer surface, but when I enter this value and run the simulation, the heat flux is not constant, as you can see in the image. But if I apply a temperature, e.g. 250ºC, the problem is solved and the entire surface stays at that temperature. Since I'm simulating in a steady regime, shouldn't I have a constant heat flux along the tube?Also, can anyone explain how shell conduction works and whether it's necessary or advisable to apply it in this case?Thank you. -
April 19, 2024 at 12:08 pmRobForum Moderator
How is the lack of uniform temperature showing that the flux isn't uniform?
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April 19, 2024 at 3:35 pmAntónio OliveiraSubscriber
But since I have constant heat flux, shouldn´t the temperature be equal by all the external surface of the wall?
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April 19, 2024 at 3:50 pmAntónio OliveiraSubscriber
Oh yes, it's different to apply 35W/cm2 at the beginning, when the water is at 5ºC, than when it is already at a higher temperature at the end of the tube...
Thank you.
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April 19, 2024 at 3:40 pmRobForum Moderator
No, if the solver has to push some Watts into the fluid which gets warmer as it passes along the tube then the heat source also has to get warmer.
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