You are not in the dark. SW can not simulate phase change between fluid, solid or gas with fluid flow.
You can simulate phase change if the fluid / solid / gas is static (no flow).
The expansion valve manufacture should have detailed performance data for calculations.
Thanks for the reply!
It is a shame that solidwork cant simulate that as it is the easiest CFD tool I have used! I shall resort to other programs.
What do you mean by detailed performance data ? Do you mean refrigerant quality, pressure etc?
Sorry for "valve" was thinking of other part of system.