Single-phase (air-air) and two-phase (air-solid) flows throngh ejector are numerically and
experimentally studied in this paper. The numerical model is performed using continuity equation
for the gas phase and the solid phase separately, and the momentum equation for a homogenous
mixture of gas-solid flow. The model takes into account the gas and solid friction with the wall
and the drag force exerted on a particle by the gas. Three different geometries of the ejector are
studied numerically and experimentally. The effects of the mixing chamber and tail pipeldiffuser,
geometries on the ejector performance are studied. In addition, the effects of fluid motive pressure
and the solid particle mass flow rate on the static pressure distribution are also studied.
Comparisons are carried out between theoretical results and the present and published
experimental data for the axial wall static pressure distribution. These comparisons show good
agreements. The obtained results show that, geometry of convergent-constant-divergent of the
mixing duct gives high vacuum pressure and preferable performance ofthe ejector.