Phase change
 

Hello everybody,
I am simulating the start up of phase change of liquid in one part of a capillary evaporator and I am having problems with the initial condition. In the beginig there is no mass flow in the inlet, after the phase chage start up there will be mass flow and this flow is due to the capillary action.
The problem is how to set this kind of boundary condition in FLUENT?
Please, anybody could help me?