A simplified approach to testing personal inhalable aerosol samplers.
Witschger-O; Willeke-K; Grinshpun-S; Aizenberg-V; Smith-J; Baron-P
American Industrial Hygiene Conference and Exposition, May 19-23, 1997, Dallas, Texas. Fairfax, VA: American Industrial Hygiene Association, 1997 May; :22
The suggested protocol for comparison of samplers with the ACGIH inhalable sampling convention has been found by several researchers to be expensive, time-consuming, difficult, and imprecise. The present work was initiated to reduce the cost and improve the accuracy of the test protocol by mounting samplers on a simplified test body instead of a full-sized manikin. The approach was tested by first ensuring that the flow field near the sampler was similar for the full-sized manikin as for the simplified test body. The simplified test body consisted of a rectangular body with a sampler situated in the center of each vertical face. The three principal sampling regimes encountered with a manikin-mounted sampler are represented by this simpler body: isoaxial sampling, 90-degree sampling, and sampling in the wake of the manikin. The velocity vectors along trajectories approaching two commercial inhalable samplers on the manikin and on the simplified test body were measured in a wind tunnel using a 3D laser Doppler velocimeter and by smoke stream observations. The manikin results indicated a range of flow fields depending on the specific manikin, the sampler location, the symmetry of the manikin's body, and the orientation of the manikin's arms. The measurements on the simplified test body indicated that the airflows approaching the samplers fall within the range of flow patterns on a manikin. A measurement of 70 um particles at 5O and 200 cm/s indicate that the two bodies give equivalent results at each of the three sampling angles. The advantage of the simplified test body is that fewer measurements need to be made, a smaller wind tunnel can be used for testing and less aerosol has to be generated. Faster, less expensive and more precise testing will allow the evaluation of a greater variety of inhalable samplers for industrial hygiene use.
Samplers; Inhalation-studies; Air-flow; Aerosols; Sampling; Measurement-equipment; Industrial-hygiene
American Industrial Hygiene Conference and Exposition, May 19-23, 1997, Dallas, Texas