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rideway February 6, 2012 09:32

Problem with CHT on a cooling device
Hello everybody.

First of all, saying that this forum is great. I have been using it for weeks to get started into CFX. Now im doing my first project with it and i am already having trouble.

System is a simple cooling water pipe with several cupper pipes across it who deliver heat (lets say 1000w for the sake of the problem). I tried to follow the CFX-5 tutorial "Conjugate Heat Transfer in a Heating Coil" but it doesnt work. The hot pipes get inifinitely warm (10 million Celsius degrees!!) and cooling water doesnt change temperature.

I applied the 1000w heat to the subdomain, like in the tutorial, but when I tried applying this heat to the fluid walls in contact with the hot pipes it worked! But the thing is that I want to know which ΔT there is between cooling and hot pipes, so I need to know where my mistake is.

Can anyone give me a hint to solve this problem? Connectivity problems? Bad modelling?

Thank you very very very much!!!

ghorrocks February 6, 2012 20:12

Sounds like you did not apply the interface between the solid and fluid domains.

rideway February 7, 2012 04:46

Thanks a lot, you are right. The thing is that i still dont know why in the tutorial that Interface is not being defined... Anyway, it works perfectly!
Thanks Glenn

ghorrocks February 7, 2012 17:18

Because the interface is automatically detected from the two coincident faces. For some reason your faces were not detected as coincident, or you turned this checking off.

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