NUMERICAL INVESTIGATION OF IMPINGING JETS IN RAREFIED CONDITION USING DSMC METHOD

10.22099/ijstm.2014.1928

Abstract

In this study, the flow field of impinging jets in rarefied condition and high pressure
ratios was investigated. Direct Simulation of Monte Carlo (DSMC) method was employed to find
the flow field at two different Knudsen numbers (Kn) of 0.1 and 0.01. For each studied Knudsen
number the effects of different nozzle-to-plate distances (L) are studied. For all cases a supersonic
jet forms downstream of the nozzle. The results show that no shock occurs in the supersonic jet
impinging on the plate in contrary to those in the continuum regime. The variations of molecular
number density, axial velocity and Mach number on the center line were computed and discussed
for two different Knudsen numbers. In general, in these conditions the gas expands from specified
upstream condition to a lower background monotonically.

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