Thanks for your reply.

plz see attached link (pdf file), this is a presentation about that paper. It will give us a good and quick view of the ejector.

The link:

and yes you are right, the flow looks like stratified flow in my result, and I need to apply something like ( evaporating -condensation interaction) or ( cavitation) , I should reach to bubble flow as the paper. 
but you know, evaporating -condensation interaction can be used when you have one fluid like water, and then convert liquid to vapor. 

but in our system we have air-water mixture, so what is the interaction that I can apply in fluent ?! 

Note#1: the paper does not mention anything about the interaction between water and air. 
Note#2: you can see the velocity and pressure  counters, also velocity profiles