December 12, 2019 at 8:59 amAstro45Subscriber
I am trying to simulate condensation of steam for an application of Moisture separator device.first i would like to explain my problem in a brief for understanding,
- steam has a moisture content of 5% of its volumetric flow rate with a pressure of 1 bar absolute.
- i used Three phases air-Primary Phase, Vapor- secondary phase ,Water- secondary phase
- for multiphase i used VOF formulations ,Implicit scheme
- For mass Transfer in between Liquid and Vapor i used Lee model with the evaporation condensation frequencies of 0.1 and 10000 respectively.
- standard K-epsilon is what i used to solve my turbulence in this modelling.
- velocity inlet is defined for the mixture with the value of 2.25 m/s.
Though i am not observing any condensation in my model, i run this model in a steady state condition.
when i change my primary phase as water i am observing some condensation of vapor to liquid but at the same time after initialization when i check for the volume fraction for mixture it shows 2 in the inlet (taking the volume fraction as 1 for water).
Is there any problem with my Primary and secondary phases modelling or else with the source term modelling for the mass transfer?
Thanks in advance,
December 12, 2019 at 1:02 pmDrAmineAnsys Employee
You mean: you have wet air and you expect condensation of the condensable component in the bulk (far away from any walls)?
December 13, 2019 at 8:40 amAstro45Subscriber
Thanks for the reply sir,
Ya the walls are in the temperature of 300K .I expect the vapor content to get condensates in this process.
December 13, 2019 at 8:58 amDrAmineAnsys Employee
If Bulk Condensation: You better write an UDF for mass transfer . There is another option to use Raoul'ts law and species mass transfer.
If the condensation happens at wall you can just model in single phase and use Eulerian Wall FIlm or Lagrangian Wall Film to capture the wall condensation.
December 13, 2019 at 10:26 amAstro45Subscriber
Is there any other ways rather than Writing UDF sir.Because i am new to FLUENT.
December 13, 2019 at 4:14 pmDrAmineAnsys EmployeeTry with species mass transfer under mixture model.
January 20, 2020 at 7:04 amAstro45Subscriber
as far as i know species are different and has transport equations on its own. Please clarify the difference in between species and normal gases in fluent sir.
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