primary/secondary phase in VoF condensation model
 

I am using VoF model with Evaporation-Condensation Lee's model to simulate a simple condensation of water vapor to liquid water in a tube having constant wall temperature far below saturation temperature of the fluid.


When I put vapor, which is inlet to the tube, as primary phase, it's temperature never drops below saturation temperature. The temperature drop across tube length follows a nice curve till saturation temperature and then follows a straight line for the saturation temperature.


When I put liquid as primary phase, I see a perfect temperature drop that does go below saturation temperature, but I see very very negligible liquid volume fraction (~10^-5).


The solving scheme is transient, implicit coupled volume fraction scheme.


Can you suggest me how can I avoid stalling of temperature drop at saturation temperature and thus have a considerable liquid volume fraction?

Same problem
 

I am thinking of using air as primary phase and both the others as secondary phases. So that, there is no transisition in the primary phase and it just acts as a carrier for the other phases

Do you mean a three phase flow?
Let me know if it works.
I may also give a try.

Thanks