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Flow thru 'Nozzle' into Vacuum

Question asked by Chris Funke on Apr 24, 2020
Latest reply on Apr 24, 2020 by Bill McEachern

I'm trying to setup and run a flow simulation that is basically a 'nozzle' discharging into a vacuum chamber. We maintain a vacuum chamber pressure of 100 mtorr and are trying to evaluate the pressure in the tube upstream from the nozzle, which in this case is an orifice, 1-2mm in diameter when we introduce an inlet mass flow of argon at 100 SCCM. Basic choked flow calculations are not matching the flow simulation results and I am struggling to understand why. Any guidance would be welcome. Thanks in advance.