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In this endeavor, the transients persisting in a vacuum ejector system (putreference of my old paper) is studied by numerically simulating the flow field,and experimentally validating the simulated results. An inertial effect wasdiscovered in the study due to which the direction of mass flux changes. As aresult of this, the recirculation zone moves forward and backward during thetransients and the pressure in the secondary chamber rises and falls. Thesystem behaves as a damped oscillatory flow in which the direction of mass fluxkeeps on changing and finally settles down to a state where there is no massflux in either direction. The movement of recirculation zone due to thisinertial effect is studied in more detail for various flow and geometricparameters. The results obtained show that the pressure and mass flux throughthe secondary chamber depend highly on both the thickness of the primary andsecondary jet and the chamber volume. The inertial effect reduces with thereduction in thickness of primary and secondary flow. The inertial effect isfound to be decreasing with increasing secondary chamber volume. It is alsofound that, the inertial effect decreases as the primary jet pressureincreases, for all other parameters remaining the same. The computationallysimulated flow field and the pressure on the secondary chamber are comparedwith the experimental data and found to be matching fairly well.

A Parametric Study on the Starting Transients of a Vacuum Ejector-Diffuser System