CFD Online Discussion Forums - phase change with CFX

· I want to simulate the phase change in micro heat pipe with triangle cross section, and I set up a model. I made the configuration as follows:

1、water and water vapor are continuous fluids, and they have the constant properties;
2、Free surface model;
3、heat transfer model: Thermal Energy, turbulence model: BSL Reynolds Stress;
4、Surface Tension Coefficient is constant;
5、Surface Tension Force: continuum Surface Force, Primary Fluid is water;
6、Interphase Transfer: Free Surface ;
7、Momentum Transfer: Drag Coefficient
8、Mass Transfer: Phase change, phase change model is “Thermal Phase change” and a constant Saturation Temperature will be given;
9、Heat Transfer: Two Resistant, vapor side set to be “zero thermal resistance”
Initial conditions: Velocity Type option is Automatic, the temperature set to be ambient temperature, the volume fraction of water is 0.75
Boundary conditions: Heat flux boundary is applied on the face of heat in and heat out, and adiabatic boundary condition is applied on the other surfaces. Wall contact angle is 101°.no slip wall is chosen for water and water vapor.

http://www.cfd-online.com/Forums/mem...cture340-1.png

Results:
The simulation results are shown as follows:

http://www.cfd-online.com/Forums/mem...cture341-2.png
http://www.cfd-online.com/Forums/mem...cture342-3.png
http://www.cfd-online.com/Forums/mem...cture343-4.png

The phenomena that liquid flows from the condenser to the evaporator in the sharp corners, while the vapour moves from the evaporator to the condenser in the centre of the micro heat pipe is not happened. The whole zone in heat pipe is full of water, that is not identical to the overall mass. And interphase mass transfer rate is too small almost close to zero.

So anyone have experience about simulation of phase change point me out the mistake I had made in my simulation? Thanks a lot!