[phl4nge]

What to do in the summer? Try to make a simulation of a drinking bird toy of course!
https://images.app.goo.gl/4Ji2jRUDVeKDJSQ5A

Geometry: simple flat section without direct modeling of walls, just closed domain.
Eulerian model with two fluids: primary phase - methylene chloride liquid, secondary phase - methylene chloride ideal gas.
Walls with convection boundary condition on head: heat transfer coefficient 200 W/m^2 K, free stream temperature 290K.
Other walls with convection boundary condition too: heat transfer coefficient 5 W/m^2 K, free stream temperature 293K.
The Population Balance Modell (4 quadrature moments) was used for mass conservation. Without PBM the mass imbalance was 10-20%.
Mass Transfer Mechanism: evaporation-condensation from liquid to gas, with using the tabular-pt-sat method to specify saturation temperature. But this method is not applicable due to the changing hydrostatic pressure of the liquid. Constant saturation temperature does not take into account changes in gas pressure.
So the questions to the community is: how to avoid this issue? Are there other ways to model evaporation and condensation of a system like this?

p.s. I didn't understand how to add screenshots
p.p.s. my english is poor, sorry =)