Fluent: Multiphase flow with evaporation at a variable saturated temperature
 

Dear all,

I am almost a new user of Fluent, and I am trying to model a quite complicate phenomenon.

I am interested in modeling the evaporation of a liquid mixture made of 2 species (A and B) in a simple geometry like a pipe (I am initially considering a 2D rectangle). During the evaporation only component A will partially evaporate, while component B will remain in the liquid phase.

The mixture has a variable boiling point in function of the concentration of A in the liquid phase. Therefore I think I also need to enable the species transport in order to track the species concentration (I am not very familiar with it).

I am using the mixture model, energy equation, turbulence k-eps, and species transport.

My problem is that I do not know how to relate the saturation temperature of the fluid with the concentration of component A in the liquid phase, since in the phases interaction in "mass transfer, evaporation-condensation" I can express it only in terms of the pressure.

Any suggestions?
Also suggestions related on how the problem can be tackled differently are highly appreciated :)

Thanks in advance

write some UDFs may be helpful to realize this process