Characteristics of Mult-Nozzle Impactors with 50 µm Laser-Drilled Nozzles
Författare
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.
Avdelning/ar
Publiceringsår
1995
Språk
Engelska
Sidor
915-931
Publikation/Tidskrift/Serie
Journal of Aerosol Science
Volym
26
Issue
6
Länkar
- Publication in Lund University research portal
- 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
- http://dx.doi.org/10.1016/0021-8502(95)00023-6
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Production Engineering, Human Work Science and Ergonomics
Nyckelord
- impactor
- aerosol
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0021-8502