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March 22, 2011, 11:53 |
conjugate heat transfer with phase change
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#1 |
New Member
Neil Yang
Join Date: Mar 2011
Posts: 6
Rep Power: 15 |
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? Thank.. |
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March 22, 2011, 22:34 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
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. |
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March 23, 2011, 12:25 |
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#3 |
New Member
Neil Yang
Join Date: Mar 2011
Posts: 6
Rep Power: 15 |
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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