A MODEL FOR SUPERSONIC IMPACTORS FOR NANO PARTICLES INCLUDING FLOW FIELD SIMULATION IN THE NOZZLE  Fulltext 

[ Omid Abouali ] - Assistant Professor Department of Mechanical Engineering, Shiraz University (Center of Excellence in Computational Mechanics) Shiraz, Iran
[ Goodarz Ahmadi ] - Professor MAE Dept., Clarkson University, NY, USA Department of Mechanical Engineering, Shiraz University (Center of Excellence in Computational Mechanics) Shiraz, Iran

خلاصه مقاله:

In this study the performance of supersonic impactors under various operating conditions is analyzed using a computer simulation model. Axisymmetric forms of the compressible Navier-Stokes and energy equations are solved and the gas flow and thermal condition in the impactor and upstream nozzle are evaluated. A Lagrangian particle trajectory analysis procedure is used and the deposition rates of different size particles under various operating conditions are studied. For dilute particle concentrations, the assumption of one-way interaction is used and the effect of particles on gas flow field is ignored. The importance of drag, Brownian forces on particle motions in supersonic impactors is discussed. It is shown that the Stokes-Cunningham drag with variable correction coefficient is most suitable for computer simulation studies of anoparticles
in supersonic impactors. The computer simulation results are shown to compare favorably with the experimental data. Flowfield results shows that the nozzle effect is limited to short distances downstream of the nozzle and the flowfield would be similar to the case the impactor modeled without the nozzle near to the impactor plate.

Impactor - Supersonic – Nano-particle – Micro-particle