VOF model of water film

Pathway

I am modeling a rectangle space with down-wall having water film. I want to know water will blow away by velocity inlet of air or not.

In Gambit, I set two fluid zones. One is for water film and the other is for air. I use VOF model in Fluent. In setting boundary condition, water fluid zone chooses water phase and sets source term and set mass is 1000 kg /s-m^3; air fluid zone chooses air phase and sets source term and set mass is 1.2 kg /s-m^3.

I want to know these steps for setting is right or not?

In Fluent help, I don't realize the meaning of mass of source term.

Can anyone give me a hand and suggestions?

Or anyone who has the tutorials like this problem for Fluent 6.2.

Sincerely