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High-Velocity Inertial Impactors

Biswas, Pratim and Flagan, Richard C. (1984) High-Velocity Inertial Impactors. Environmental Science and Technology, 18 (8). pp. 611-616. ISSN 0013-936X. doi:10.1021/es00126a009.

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Cascade impactors with large pressure drops across individual stages are useful for classifying submicron aerosols even though the flow becomes compressible when the ratio of the downstream to upstream stagnation pressure falls below r = 0.95 and sonic when r < 0.53 (for air). The variation of collection efficiency with pressure ratio is examined experimentally. The cutoff Stokes number does not exhibit significant dependence on the pressure ratio in the range from r = 0.97 (incompressible flow) to r = 0.19 (choked flow). The impactor stage pressure ratio may be estimated by modeling the stage as a nonideal, compressible flow nozzle with a discharge coefficient which is well correlated with the jet Reynolds number divided by the nozzle throat aspect ratio. Predictions of the variation of the cutoff diameter with flow rate, temperature, and inlet pressure are presented for impactors with high Mach number jets.

Item Type:Article
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Flagan, Richard C.0000-0001-5690-770X
Additional Information:© 1984 American Chemical Society Received for review July 28,1983. Accepted February 3,1984. Funding for this research was provided by the Office of Research and Development, US. Environmental Protection Agency, under Grant R-809191010. The conclusions represent the views of the authors and do not necessarily represent the opinions, policies, or recommendations of the US. Environmental Protection Agency.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R-809191010
Issue or Number:8
Record Number:CaltechAUTHORS:20150630-105755532
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Official Citation:High-velocity inertial impactors Pratim. Biswas and Richard C. Flagan Environmental Science & Technology 1984 18 (8), 611-616 DOI: 10.1021/es00126a009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58703
Deposited By: Irina Meininger
Deposited On:22 Jul 2015 21:24
Last Modified:10 Nov 2021 22:09

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