Learning Forum

[peppers]

I analyzed the heat transfer in the heat exchanger, where air enters through the inlet ("i") and leaves at the outlet ("o"). metal A conducts metal B and then metal B convects air, so the air temperature rises. I've made it and it's convergent, but why is the temperature distribution like this (which is clear, especially at the inlet I've defined 303 K), and this is the result in 10 minutes (transient) which is 1600K. why is this the temperature distribution like this and the temperature is so big? is there something wrong with my mesh interfaces? how should it be?

[NickFL]

 

 

Yes I too suspect there is no heat transfer from the solid to the air because of a incorrect interface definition. You can verify this several ways. Check the heat transfer flux in the Reports section of the Results Menu. Is there any heat transfer across the fluid-solid interface? Or what is the temperature of the air at the outlet? Your contours above are not really helpful in seeing any change in air temprature. (And is there really some part of your domain that is 1 degree Kelvin?).

Are the solid domains A & B 2D objects (where a thickness is modeled) or does it have a physical thickness with elements through the solid?

I would also recommend attempting this tutorial before continuing. It will help you understand how to set up the interfaces.
https://courses.ansys.com/index.php/courses/heat-transfer-modeling-in-ansys-fluent/lessons/tutorial-heat-transfer-modeling-in-ansys-fluent-lesson-6/

[Rob]

To add, the temperature range is 1-5000K which corresponds to the default temperature limiter in Fluent. If you check convergence I suspect it's not anywhere near where it ought to be.