In this study the performance of supersonic and hypersonic impactors under various operating conditions was analyzed using a computer simulation model. The study was focused on the effect of the nozzle upstream condition on the performance of the supersonic and hypersonic impactors. In our earlier work, the computational domain covered downstream of the nozzle with a sonic boundary condition at the inlet. In the present study, the computational domain included the upstream nozzle where the flow and particles enter with at low velocities. Axisymmetric forms of the compressible Navier-Stokes and energy equations were solved and the gas flow and thermal condition in the impactor were for evaluated. A Lagrangian particle trajectory analysis procedure was used and the deposition rates of different size particles under various operating conditions were studied. For dilute particle concentrations, one-way interaction was assumed and the effect of particles on gas flow field was ignored. The importance of drag and Brownian forces on particle motions in supersonic/hypersonic impactors was analyzed. Sensitivity of the simulation results to the use of different expressions for the drag force was also examined. It was shown that when the upstream nozzle is included in the computational model, the Stokes-Cunningham drag with variable correction coefficient and a constant Cunningham correction factor based on stagnation point properties lead to the same results. Thus these drag laws are most suitable for computer simulation studies of nano-particles in supersonic/hypersonic impactors. The computer simulation results were shown to compare favorably with the experimental data.
Skip Nav Destination
ASME 2005 Fluids Engineering Division Summer Meeting
June 19–23, 2005
Houston, Texas, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4199-5
PROCEEDINGS PAPER
Numerical Modeling of Upstream Nozzle Effect in Supersonic/Hypersonic Impactors for Nano-Particles
Omid Abouali,
Omid Abouali
Shiraz University, Shiraz, Iran
Search for other works by this author on:
Goodarz Ahmadi
Goodarz Ahmadi
Clarkson University, Potsdam, NY
Search for other works by this author on:
Omid Abouali
Shiraz University, Shiraz, Iran
Goodarz Ahmadi
Clarkson University, Potsdam, NY
Paper No:
FEDSM2005-77433, pp. 701-706; 6 pages
Published Online:
October 13, 2008
Citation
Abouali, O, & Ahmadi, G. "Numerical Modeling of Upstream Nozzle Effect in Supersonic/Hypersonic Impactors for Nano-Particles." Proceedings of the ASME 2005 Fluids Engineering Division Summer Meeting. Volume 2: Fora. Houston, Texas, USA. June 19–23, 2005. pp. 701-706. ASME. https://doi.org/10.1115/FEDSM2005-77433
Download citation file:
6
Views
Related Proceedings Papers
Related Articles
Review—Numerical Models for Dilute Gas-Particle Flows
J. Fluids Eng (September,1982)
On the Modeling and Simulation of Ion Drag Electrohydrodynamic Micropumps
J. Fluids Eng (May,2011)
Numerical Simulation of Heavy Particle Dispersion—Scale Ratio and Flow Decay Considerations
J. Fluids Eng (March,1994)
Related Chapters
Ideal Gas Flow in Nozzles and Diffusers
Case Studies in Fluid Mechanics with Sensitivities to Governing Variables
Conclusions
Bacteriophage T4 Tail Fibers as a Basis for Structured Assemblies
Kinetic Theory
Collective Phenomena in Plasmas and Elsewhere: Kinetic and Hydrodynamic Approaches