If the flow is single phase and high Mach number, then it would be good enough to neglect friction. But, in your case, probably not.
In my case I am looking for how much mass flow that will pass. Then I think that the important thing is to see what happens upstream the critical throat.
My mixture is air and oil.
Yes- You can neglect the friction forces to observe mass flow. I reckon it is a very first step of numerical modeling to keep the model simple. You can then include the friction force to see it's effect on the mass flow upstream and downstream.
-Faizan
In my case I'm actually looking for the effect of the curvature on the mass flow over the mesh clearance in a screw compressor. There it is also necessary to look at the effect of the moving walls. I suspect that only the upstream of the critical section effects the flow through the critical section.
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