I'm simulating a tube filled with water in its liquid phase which, due to some heat flux at the walls of the tube, must change its phase to vapour.
hello Elias
For your problem I am not sure that it can change its phase or not but if your heat flux is enough to change the phase of the water-vapor then you can have the results you desire, and you can see that by having multiple planes in your geometry.
hi Elias
For phase change model either you can use evaporation model, already available in FLUENT or write your own UDF for phase change simulation. Most probably available evaporation of FLUENT is not going to give you satisfactory result due to its limitations. So its better to go for UDF, you may get lot of ideas from UDF manual of fluent. One more option is boiling model available in FLUENT 14.0, that you may also try.
In your case, you have to be sure the energy equation is active that will give you ability to set the heat transfer and mass transfer from each phases according to your boundary conditions and regarding to two-phase modelling, interphase tracking sould be activated as well. However, as Yogesh mentioned before, you still need to chick the UDF manula to obtain abetter way to simulate this case.
Yes its possible to make a CFD simulation (with FLUENT) of the phase change of a fluid inside a tube but the desire result which you are looking for are depend on your boundary conditions like as wall heat flux and rest conditions like as energy equation & multiple planes for visualization are already suggested by others.
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