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Collection efficiency of round-nozzle impactors with horizontal annular inlet

Title
Collection efficiency of round-nozzle impactors with horizontal annular inlet
Author
육세진
Keywords
Inertial impactor; Collection efficiency; Stokes number; Round nozzle; Horizontal annular inlet
Issue Date
2014-08
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF AEROSOL SCIENCE, 2014, 74, p.63-69
Abstract
In this study, a horizontal annular inlet was applied to a round-nozzle impactor in an effort to reduce the cut-off diameter. The collection efficiencies of round-nozzle impactors with either a vertical inlet, which has conventionally been used, or a horizontal annular inlet were investigated both numerically and experimentally. For the comparison, the nozzle width, nozzle-to-plate distance, impaction plate diameter, and flow rate of the aerosol drawn into the impactor were set the same for both the vertical inlet impactor and horizontal annular inlet impactor. A parametric study was performed to analyze the effects of the width of the horizontal annular inlet and nozzle throat length on the collection efficiency of round-nozzle impactors with nozzle Reynolds numbers ranging from 500 to 2600. By replacing the vertical inlet with the horizontal annular inlet, the square root of the Stokes number corresponding to the cut-off diameter could be reduced by approximately 30%. In other words, the value of (Stk(50))(1/2) was decreased from 0.49 to 0.32 or 0.33 when considering the effect of gravity. (C) 2014 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0021850214000639?via%3Dihubhttp://hdl.handle.net/20.500.11754/47968
ISSN
0021-8502; 1879-1964
DOI
10.1016/j.jaerosci.2014.04.007
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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