The Development of a Test System for Investigating the Performances of Personal Aerosol Samplers under Actual Workplace Conditions

Botham, R.A.; Hughson, G. W.; Vincent, J.H.; Mark, D.

doi:10.1202/0002-8894(1991)052<0423:tdoats>2.0.co;2

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“…Testing of personal aerosol samplers for inhalable dust has involved manikin-mounted samplers in a wind tunnel or in the work environment to simulate samplers worn on a worker (Botham et al 1991;Chung et al 1992;Chung et al 1987;Kenny et al 1997;Mark and Vincent 1987). To understand the mechanisms affecting personal sampler performance, it is desirable to make measurements of both the air ow around the samplers mounted on the manikin and the sampling ef ciency of the samplers.…”

Section: Introductionmentioning

confidence: 99%

Development of a Large Particle Aerosol Distribution System for Testing Manikin-Mounted Samplers

Smith¹,

Bartley²,

Watkins³

1999

Aerosol Science and Technology

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ABSTRACT. Personal samplers used to determine the inhalable fraction of workplace dust are tested while mounted on a manikin, which simulates a worker. To understand the mechanisms affecting the performance of such samplers, researchers must measure the air ow around the body where the samplers are mounted. Therefore, wind tunnel facilities to determine both air ow conditions around samplers and sampling ef ciency are needed.A wind tunnel system was developed that was large enough to accommodate the top half of a life-sized manikin and employed a laser Doppler velocimeter for velocity measurements around the manikin. For generating particles up to 70 m m, an aerosol generation system, using a two-dimensional scanning system to cover an extended area, was developed and tested. The generation system had carriages with linear bearings mounted on rod assemblies for scanning in the horizontal and vertical directions. Screw drives, powered by stepper motors under computer control, moved the carriages in a preprogrammed pattern. The generation system was characterized for its ability to generate uniform concentrations of aerosols over an extended area at wind speeds of 0.5 and 2 m/s and particle sizes of 7 and 70 m m. Uniformity of concentration over the area studied, in the absence of the manikin, was 10% relative standard deviation (RSD) or better, except for 7 m m particles at a wind speed of 0.5 m/s where some nonuniformity was observed. The uniformity under these conditions was improved by rearranging the distances between components in the wind tunnel.

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Section: Introductionmentioning

confidence: 99%