conjugate heat transfer with phase change
Hi to all,
I'm simulating conjugate heat transfer with phase change. A cold fluid flows in outer pipe, and a hot fluid flows in inner pipe, a solid domain conducts the heat flow between them. The cold fluid will be heated to evaporate.
Both the inlet velocities are quite low, so I set the flow as laminar.
However, the solution couldn't come to convergence.
Then I tried to set the flow as turbulence, the solution could convergence well, but there was a new problem that the heat transfer solution looked bad. The cold fluid could not evaporate however I changed both the inlet conditions. And the monitor which I set before indeed kept at an invariant liquid volume fraction value of 1.
What the cause of these problems? Mesh? Phase change model?
Sounds like you should build up your model one bit at a time. You have a number of complex systems and you need to get them working well by themselves before they will work together.
I would model the evaporating cold fluid by itself and make sure that works reliably before I added CHT and the hot fluid.
Um, before this I've made a simple simulation with evaporation only. I tried both particle model and mixture model which both came to a good solution. Then I made a conjugate heat transfer simulation without phase change, it also performed well. However, once I conjugated fluid and solid, problems came out.
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