Reply To: Volume Fraction too Low. How to Improve?

[Rob]

Fluent doesn't know which material is liquid and which is vapour in the mass transfer field, so there is a convention regarding the from & to fields. It's in the User's Guide, and is something I always have to look up. If you click on Help in the Mass Transfer tab it'll take you to the panel help, and from there to the setup. 

Fixing the solid region temperature may not be sensible. Check the wet side wall temperature and also near wall cell temperature to see what's going on. 

If you have near enough zero pressure loss check the mass flow: what are you setting on the inlet?