ejector simulation
 

Hello. I'm new to ansys. I need some help regarding fluent simulation. I have two concentric inlets, one is ammonia liquid (having a higher gauge pressure) and the other is ammonia vapor (having a lower gauge pressure). They will mix together at the mixing chamber and will exit in a single outlet as indicated in the attached image. My questions are:

1.) Should I use multiphase model? and if yes, what is the appropriate model to be used?

2.) What is the appropriate turbulence model for this scenario? The liquid ammonia will have a suction effect on the vapor ammonia. Mixing occurs at the mixing chamber and shockwaves are expected to occur.

3.) How do I set the fluids to their respective inlet? liquid ammonia at inlet_1 and vapor ammonia at inlet_2. Do I have to set different fluid zones for the different inlet? Currently, the geometry is a single part single body object.

4.) What is the appropriate boundary condition for the two inlets? Is it Mass inlet, Velocity inlet, or Pressure Inlet? Known properties are only Pressure, velocity, temperature and mass flow rate for liquid ammonia. The mass flow rate of vapor ammonia is only dictated by the "suction effect" caused by the liquid ammonia and this is the area of interest for this study; to know what fraction of vapor ammonia will be "sucked" by the liquid ammonia.

5.) Another area of interest is to know the exit properties of the resulting mixed fluids at the outlet, e.g., Pressure, Temperature, Velocity etc. What is the appropriate boundary condition to be used at the outlet for this scenario?

I apologize for this long thread and I acknowledge that some of these questions may already have been answered from other threads but I would just like to have it summarized in this way. Any reply from you guys is highly appreciated especially from the ansys simulation guru's. Thanks in advance.

-mark