I'm very busy at the moment. So I thought I will just show you something we worked on a few weeks ago. Two classmates and myself had to simulate some two-component nozzles as educational project. We used OpenFoam with the solver InterFoam. The results were a bit disappointing, because there was no spraying, just a straight stream out of the nozzles. So I don't want to show you these. We also decided to simulate a Venturi nozzle to check if the suction works.
We simplified the tube as 2D mesh. So it is more a simulation of a endless gap than a real tube. Further the solver doesn't support compressible mediums and mixing and we didn't make any real experiments. As a result I can't tell you if the simulation is realistic. I just like the colored images ; )