Learning Forum

[Amir]

I have a simulation of humid-air condensation using mixture multiphase model, is it possible to calculate/observe the mass of condensate(liquid water)?

[Ahmed Hussien]

Which phase change model are you currently using in your simulation? If you anticipate vapor condensing on a specific surface, I suggest using the Eulerian Wall Film Model (EWF). You will need to enable phase change and describe the condensation process. Also, it is important to enable species transport to describe the humid air mixture in your simulation.

 

Once the case is solved, you will have access to various additional variables that can be used for post-processing , such as Film Mass and Film Mass Flow Rate.

 

For further information and guidance regarding the Eulerian Wall Film Model (EWF), I recommend referring to the Ansys Theory Guide Chapter 18: Eulerian Wall Films (ansys.com) and Ansys User Guide Chapter 28: Modeling Eulerian Wall Films (ansys.com). 

[Amir]

It is a 2D simulation so EWF is not available. I am using mixture multiphase model with Lee condensation-evaporation and piecewise-linear for saturation temperature, species transport is enabled as well. The case is solved and I am wondering if it is possible to calculate the mass of liquid-water generated as a result of condensation [either in fluent-solution tab or in post processing].

Thanks

[Ahmed Hussien]

You can calculate the mass of each phase directly using the Volume Integrals feature. By accessing the Results menu, selecting Volume Integrals, and choosing the Mass option, you can specify the phase for which you want to calculate the mass.

[Amir]

Thanks for your reply Ahmed,

It seems to me the option that you mentioned calculates the mass of a speciphic cell zone if it was filled with the selected phase (in this case liquid-water). That is not what I am looking for, I am looking for a way to calculate how much liquid water is generated as a result of condensation at the end of the simulation. So far my understanding is that such option is not available in mixture model! If I am wrong please let me know.