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Condensation Mass Flow Rate

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Old   April 23, 2019, 15:53
Question Condensation Mass Flow Rate
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Aseel
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Hello everyone,

I have created a model to estimate the condensation mass flow rate. I used VOF, Energy and K epsilon Models. My model has a velocity inlet for the steam to enter and a pressure outlet. the solution converges. But, the issue is that the mass flow rate for the water liquid is zero! I increased the number of iterations. But, there is no change. I only get the mass flow rate for the mixture or the water vapor.

Please, find the picture of the obtained results.

Does anyone have any idea? or encountered a similar issue.

Thanks in advance.
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Old   April 25, 2019, 14:30
Default Condensation Mass Flow Rate
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Melih MeriÁ
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which mass transfer model did you use? Can you define your setup more detailed?

Last edited by mmntmflx; April 26, 2019 at 03:25.
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Old   April 28, 2019, 05:08
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Aseel
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I have used the evaporation-condensation mass transfer model specifically Lee model (I think its the default one).

by the way, it's a 2D CFD model, the initial conditions are at room temperature. the entering steam is at 380 K (above saturation temp). the temperature of the walls is maintained below the Tsat to allow the condensation.

the velocity inlet is about 0.11 m/s .
the backflow total temperature at the outlet is 300 K..

Thank you!
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condensation model, fluent, mass flow rate, multiphase flow, multiphase mixture model

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