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Old   November 7, 2014, 20:55
Smile problem with mass transfer
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Bill Wang
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I am doing phase-change simulation in vapor chamber with fluent 14.5. The model could be seen in interface.png.
The evaporation should only occur at the evaporation interface. However, the VOF/Mixture simulates the phase-change under the condition that T_cell>T_SAT, which means that the evaporation will happen where the condition meets.
Hence, I have written a UDF to apply the DEFINE_MASS_TRANSFER at the evaporation interface. temperature.c
First, I obtained the temperature and pressure at the interface(I am not sure I have written UDF of this part right). Then I wrote the mass transfer UDF, in which I calculated the saturated pressure using the temperature at the interface and then compared it with the local pressure to decide if there is mass transfer happening.
So, I need help to get the interface temperature and then apply the UDF only at the interface not the whole domain.
My email is, I could send you the cas file if you would like.
Thank you.
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define_mass_transfer, evaporation-interface, udf and programming

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