Supersonic/hypersonic impactors are used as a collector and/or size separator of nano- and micro-particles. Thin film and fine line pattern deposition by aerosol jets are other applications of deposition of supersonic/hypersonic impactors. At extremely low backpressures, the exiting flow from a nozzle forms a supersonic free jet. The supersonic jet forms a strong normal shock in the front of the impactor plate. The stagnation pressure, backpressure and distance between the nozzle exit and the impactor plate affect the flow field. Due to the rather complicated flow in the impactor, studies of particle motions in supersonic impactors are rather scarce. In this study the airflow and particle transport and deposition in a supersonic/hypersonic impactor are numerically simulated. The axisymmetric compressible Navier-Stokes equation is solved and the flow properties are evaluated. It is assumed that the particle concentration is dilute, to the extent that the presence of particles does not alter the flow field. Deposition of different size particles under different operating conditions is studied. The importance of drag, lift and Brownian forces on particle motions in supersonic impactors is discussed. Sensitivity of the simulation results to the use of different expressions for the drag force is also examined. A strong bow shock on the flowfield has much effect in drag forces on particles. It is shown that the Stokes-Cunningham drag with variable correction coefficient is most suitable for computer simulation studies of nano-particles in supersonic/hypersonic impactors. The computer simulation results are shown to compare favorably with the experimental data.
Skip Nav Destination
ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
July 6–10, 2003
Honolulu, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3697-5
PROCEEDINGS PAPER
Bow Shock Effect on Particle Transport and Deposition in a Hypersonic Impactor
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:
FEDSM2003-45072, pp. 1663-1668; 6 pages
Published Online:
February 4, 2009
Citation
Abouali, O, & Ahmadi, G. "Bow Shock Effect on Particle Transport and Deposition in a Hypersonic Impactor." Proceedings of the ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. Volume 2: Symposia, Parts A, B, and C. Honolulu, Hawaii, USA. July 6–10, 2003. pp. 1663-1668. ASME. https://doi.org/10.1115/FEDSM2003-45072
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
Engine Design and Operational Impacts on Particulate Matter Precursor Emissions
J. Eng. Gas Turbines Power (March,2008)
Study on Lateral Jetting Range During an Arc-Curved Jet Impacting Nonplanar Solid Surfaces
J. Fluids Eng (October,2018)
Initial Stage of Natural Convection Over a Hot Aerosol Sphere
J. Fluids Eng (June,2007)
Related Chapters
A Simple Carburetor
Case Studies in Fluid Mechanics with Sensitivities to Governing Variables
Fans and Air Handling Systems
Thermal Management of Telecommunications Equipment
Numerical Simulation of Ship's Air Intake System and Selections of Salt Aerosol Sampling Points
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3