A recirculation aerosol wind tunnel for evaluating aerosol samplers and measuring particle penetration through protective clothing materials.
Jaques-PA; Hsiao-T-C; Gao-P
Ann Occup Hyg 2011 Aug; 55(7):784-796
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.
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
Pengfei Gao, National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA
Manufacturing; Services: Public Safety
Annals of Occupational Hygiene