Thank you for your explanation. It is being understood that the heat transfer from outside the domain comes in contact with the wall due to the process of evaporation. 

The interfacial forces are drag, lift, wall lubrication, turbulent dispersion, and turbulent interaction forces, right? So I just need to activate only the drag force based on your recommendation. 

The URF for vaporization mass is already 0.5, is it necessary to decrease again? Thank you.

Best regards,