Rob
Ansys Employee
If you're evaporating the water & ethanol into air the gas phase needs to have a mixture assigned containing water-vapour, ethanol-vapour and air or you can't evaporate the material as it has no where to go. nOpen channel tends to imply VOF, you just need a channel with air: no need for VOF or Eulerian unless you plan on resolving the droplets which I don't advise on a Student licence!