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

Gudmundsson, Anders LU ; Bohgard, Mats LU and Hansson, Hans-Christen (1995) In Journal of Aerosol Science 26(6). p.915-931
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
impactor, aerosol
in
Journal of Aerosol Science
volume
26
issue
6
pages
915 - 931
publisher
Elsevier
external identifiers
  • Scopus:0008327709
ISSN
0021-8502
DOI
10.1016/0021-8502(95)00023-6
language
English
LU publication?
yes
id
73500bbf-604a-44f5-a156-f19b965f3407 (old id 798592)
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http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V6B-3YF4DH4-N2&_user=745831&_coverDate=09%2F30%2F1995&_alid=688975176&_rdoc=1&_fmt=summary&_orig=search&_cdi=5810&_sort=d&_docanchor=&view=c&_ct=1&_acct=C000041498&_version=1&_urlVersion=0&_userid=745831&md5=0e72adbdc3f8cbb9ad51fda73828a481
date added to LUP
2008-02-13 10:38:09
date last changed
2017-01-01 07:47:04
@article{73500bbf-604a-44f5-a156-f19b965f3407,
  abstract     = {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.},
  author       = {Gudmundsson, Anders and Bohgard, Mats and Hansson, Hans-Christen},
  issn         = {0021-8502},
  keyword      = {impactor,aerosol},
  language     = {eng},
  number       = {6},
  pages        = {915--931},
  publisher    = {Elsevier},
  series       = {Journal of Aerosol Science},
  title        = {Characteristics of Mult-Nozzle Impactors with 50 µm Laser-Drilled Nozzles},
  url          = {http://dx.doi.org/10.1016/0021-8502(95)00023-6},
  volume       = {26},
  year         = {1995},
}