Thank you for answering.
So, I have already made sure that my gravity is set on the correct direction.
However, I'm still confused about what you mentioned,
Why do I only need two phases (air and vapor) ?
Don't I need water-liquid as a third phase, so that I can model the mass transfer through the mixture(multiphase) settings ?
And also, I would like to know further about these droplets size, if you would kindly help me with this.
Thank you very much.