Journal article
A rotating bluff-body disc for reduced variability in wind tunnel aerosol studies
The Annals of occupational hygiene, Vol.55(1), pp.86-96
01/2011
DOI: 10.1093/annhyg/meq078
PMCID: PMC4780254
PMID: 21097990
Abstract
A rotating bluff-body disc (RBD) was developed to reduce spatiotemporal variability associated with sampling supermicron aerosol in low-velocity wind tunnels. The RBD is designed to rotate eight personal aerosol samplers around a circular path in a forward-facing plane aligned with the wind tunnel cross section. Rotation of the RBD allows each sampler to traverse an identical path about the wind tunnel cross section, which reduces the effects of spatial heterogeneity associated with dispersing supermicron aerosol in low-velocity wind tunnels. Samplers are positioned on the face of the RBD via sampling ports, which connect to an air manifold on the back of the disc. Flow through each sampler was controlled with a critical orifice or needle valve, allowing air to be drawn through the manifold with a single pump. A metal tube, attached to this manifold, serves as both the axis of rotation and the flow conduction path (between the samplers and the vacuum source). Validation of the RBD was performed with isokinetic samplers and 37-mm cassettes. For facing-the-wind tests, the rotation of the RBD significantly decreased intra-sampler variability when challenged with particle diameters from 1 to 100 μm. The RBD was then employed to determine the aspiration efficiency of Institute of Occupational Medicine (IOM) personal samplers under a facing-the-wind condition. Operation of IOM samplers on the RBD reduced the between-sampler variability for all particle sizes tested.
Details
- Title: Subtitle
- A rotating bluff-body disc for reduced variability in wind tunnel aerosol studies
- Creators
- Kirsten A Koehler - Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, 80523-1681, USAT Renee AnthonyMichael van DykeJohn Volckens
- Resource Type
- Journal article
- Publication Details
- The Annals of occupational hygiene, Vol.55(1), pp.86-96
- Publisher
- England
- DOI
- 10.1093/annhyg/meq078
- PMID
- 21097990
- PMCID
- PMC4780254
- ISSN
- 0003-4878
- eISSN
- 1475-3162
- Grant note
- R21 OH009114 / NIOSH CDC HHS OH009114 / NIOSH CDC HHS
- Language
- English
- Date published
- 01/2011
- Academic Unit
- Occupational and Environmental Health
- Record Identifier
- 9983997488802771
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