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Entrainment of fine particles from surfaces by impinging shock waves

Smedley, G. T. and Phares, D. J. and Flagan, R. C. (1999) Entrainment of fine particles from surfaces by impinging shock waves. Experiments in Fluids, 26 (1-2). pp. 116-125. ISSN 0723-4864. doi:10.1007/s003480050270.

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When a shock wave impinges on a surface, it reflects and propagates across the surface at supersonic velocity. The gas is impulsively accelerated by the passing shock wave. The resulting high-speed flow imparts sufficiently strong forces to particles on the surface to overcome strong adhesive forces and entrain the surface-bound particles into the gas. This paper describes an experimental study of the removal of fine particles from a surface by impinging shock waves. The surfaces examined in this study were glass slides on which uniformly sized (8.3 μm diameter), spherical polystyrene particles had been deposited. Shock waves were generated in a small, open-ended shock tube at various heights above and impingement angles to the surface. Particle detachment from the carefully prepared substrates was determined from images of the surfaces recorded before and after shock impingement. A single shock wave effectively cleaned a large surface area. The centerline length of the cleared region was used to characterize the efficacy of shock cleaning. A model based upon the far field solution for a point source surface shock provides a good fit to the clearance length data and yields an estimate to the threshold shock strength for particle removal.

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Flagan, R. C.0000-0001-5690-770X
Additional Information:© 1999 Springer. Received: 13 November 1997/Accepted: 23 April 1998. Support for this work is provided by the FAA under Grant 93-G-060. The authors thank Prof. Paul Bellan of Caltech for providing an early prototype IEC valve that served as the basis for the design of the present valve and Frank Cosso of Caltech for assistance in the design of the power supply used to drive the IEC valve.
Funding AgencyGrant Number
Federal Aviation Administration (FAA)93-G-060
Issue or Number:1-2
Record Number:CaltechAUTHORS:20150806-165333496
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59287
Deposited By: Irina Meininger
Deposited On:09 Dec 2015 19:54
Last Modified:12 Apr 2023 19:55

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