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A recirculation aerosol wind tunnel for evaluating aerosol samplers and measuring particle penetration through protective clothing materials.

Authors
Jaques-PA; Hsiao-T-C; Gao-P
Source
Ann Occup Hyg 2011 Aug; 55(7):784-796
NIOSHTIC No.
20039349
Abstract
A recirculation aerosol wind tunnel was designed to maintain a uniform airflow and stable aerosol size distribution for evaluating aerosol sampler performance and determining particle penetration through protective clothing materials. The oval-shaped wind tunnel was designed to be small enough to fit onto a lab bench, have optimized dimensions for uniformity in wind speed and particle size distributions, sufficient mixing for even distribution of particles, and minimum particle losses. Performance evaluation demonstrates a relatively high level of spatial uniformity, with a coefficient of variation of 1.5-6.2% for wind velocities between 0.4 and 2.8 m s21 and, in this range, 0.8-8.5% for particles between 50 and 450 nm. Aerosol concentration stabilized within the first 5-20 min with, approximately, a count median diameter of 135 nm and geometric standard deviation of 2.20. Negligible agglomerate growth and particle loss are suggested. The recirculation design appears to result in unique features as needed for our research.
Keywords
Aerosol-particles; Aerosol-sampling; Airborne-particles; Air-monitoring; Air-samplers; Air-sampling; Air-sampling-equipment; Air-sampling-techniques; Analytical-processes; Fiber-deposition; Filter-fabrics; Laboratory-techniques; Laboratory-testing; Mathematical-models; Measurement-equipment; Microscopic-analysis; Nanotechnology; Particle-aerodynamics; Particle-counters; Particulates; Particulate-sampling-methods; Quantitative-analysis; Statistical-analysis; Author Keywords: aerosols; aerosol chamber; aerosol samplers; protective clothing; particle penetration; wind tunnel
Contact
Pengfei Gao, National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA
CODEN
AOHYA3
Publication Date
20110801
Document Type
Journal Article
Email Address
PGao@cdc.gov
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Issue of Publication
7
ISSN
0003-4878
NIOSH Division
NPPTL
Priority Area
Manufacturing; Services: Public Safety
Source Name
Annals of Occupational Hygiene
State
PA
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