I still think your explanation is not clear, thats why I asked again. I belive you are refferring to the Fluent User guide/ Theory guide. Since I cannot go through the entire 5000+ pages today, I have read the section “14.7.5. Evaporation-Condensation Model” in theory guide and section “ Evaporation-Condensation Mechanism” in the user guide. In my understanding what I setup is correct to what explained there.

I have set mixture model with phase-1 as r134a-vapour and phase-2 as r34a-liquid. The interaction between phases is modelled using the evaporation-condensation model. The materials are made using rgp tables created using fluent itself. I am getting an error stating latent heat is negative at cell zero on each computational node.

I believe its a bug in Fluent.