Numerical and Experimental Investigation of the Effect of Micro Restriction Geometry on Gas Flows through a Micro Orifice

This study experimentally and numerically investigates the effects of nozzle/needle distance (clearance) supply pressure on single phase compressible gas flow in a micro orifice with needle restriction, which play important roles many engineering applications such as cryogenic cooling MEMS (microelectromechanical systems) device cooling. Nitrogen was used working fluid at pressures ranging from 10 to 50 bars, while conical draft angle 15°. The changed 100 µm 500 µm. From experimental point view, load provided by over measured sensor. For numerical analysis, six turbulence models three wall treatments were considered simulations. effect restriction high-pressure micro-gas flows further assessed modeling. It is evident results that utilized model has considerable computed results. k–ε standard Spalart–Allmaras found be not suitable for modeling micro-scale restriction. On other hand, realizable k–ω SST exhibit best performance predicting