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Characteristics of Mult-Nozzle Impactors with 50 µm Laser-Drilled Nozzles

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Author

Summary, in English

The objective of this study was to provide data for the design of multi-nozzle impactors giving size-fractionated samples for X-ray emission analysis and for size-distribution determinations of the α-particle activity from aerosol-particle-attached radon progenies. Different multi-nozzle impactors with laser-drilled 50–60 μm diameter nozzles designed for a cut-off diameter of about 0.05 μm were experimentally characterised. The nozzles were placed in a spiral pattern within a circle of 8.0 mm diameter. The nozzle-plate porosities were 0.013 and 0.050 (porosity = total cross-sectional area of nozzles divided by nozzle-plate area). The results show that laser-drilled nozzles can be used for multi-nozzle impactors and that the maximum nozzle-plate porosity is limited by the cross flow. The collection characteristics of the multi-nozzle impactors studied here were found to be more dependent on the Reynolds number and the S/W ratio [the ratio of the distance (S) between nozzle plate and impaction plate to the nozzle diameter (W)], than what has been shown for single-nozzle impactors. The S/W ratio and the Reynolds number must be considered if high size resolution is to be achieved.

Publishing year

1995

Language

English

Pages

915-931

Publication/Series

Journal of Aerosol Science

Volume

26

Issue

6

Document type

Journal article

Publisher

Elsevier

Topic

  • Production Engineering, Human Work Science and Ergonomics

Keywords

  • impactor
  • aerosol

Status

Published

ISBN/ISSN/Other

  • ISSN: 0021-8502