I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are defined as two materials of suitable viscosity and density. Walls are wetted with contact angle pi/2, surface tension 0.07. The outlet is "pressure, no viscous stress" at 0 Pa. The mesh is simply physics controlled at the "finer" setting.
The attached .gif shows nice droplet formation generated by model. It looks similar to what is seen experimentally, except the oil droplets seem to dissolve in the water phase! I have not been able to figure out which parameter must be missing to make the two phases immiscible (I actually thought Two-Phase Flow was immiscible per standard).
Can anyone give a quick suggestion as to how I can keep the oil droplets from dissolving in the water phase?
Thanks in advance!
Best regards
Kristian Sørensen
Denmark
The attached .gif shows nice droplet formation generated by model. It looks similar to what is seen experimentally, except the oil droplets seem to dissolve in the water phase! I have not been able to figure out which parameter must be missing to make the two phases immiscible (I actually thought Two-Phase Flow was immiscible per standard).
Can anyone give a quick suggestion as to how I can keep the oil droplets from dissolving in the water phase?
Thanks in advance!
Best regards
Kristian Sørensen
Denmark