writing UDF for modelig mass transfer for VOF

ardalan soleymani

hi every body I'm trying to model mass transfer between water and a gas mixture which is rich of water vapor(I call it air-water) in a tank. air-water comes through tank interior and pressurize the water which is drained through the tank exterior. I think the best model for modeling this problem is using the VOF multiphase model. VOF multiphase model dosen't account the heat and mass transfer between phases by default, and user needs to use UDF for modeling these processes. if any body have an experience in writing UDF for modeling heat and mass tansfer in VOF multiphase model or other useful advisements plesase tell me about it.