A rotating bluff-body disc for reduced variability in wind tunnel aerosol studies

Details

• Personal Author:
  Anthony, T. Renée ; Koehler KA ; van Dyke M ; Volckens J
• Description:
  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 mm. 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. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Movements Environmental Monitoring Occupational Health Safety
• Keywords:
  Aerosol Sampling Air Flow Air Samples Air Sampling Equipment Air Sampling Techniques Author Keywords: Aerosol Sampling IOM Sampler Particle Aerodynamics Pumps Samplers Sampling Equipment Sampling Methods Testing Equipment Vacuum Equipment Wind Tunnel

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• ISSN:
  0003-4878
• Document Type:
  Text
• Funding:
  Grant ; Cooperative Agreement
• Genre:
  Journal Article
• Place as Subject:
  Colorado ; Iowa ; OSHA Region 7 ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  86-96
• Volume:
  55
• Issue:
  1
• NIOSHTIC Number:
  nn:20038223
• Citation:
  Ann Occup Hyg 2011 Jan; 55(1):86-96
• Contact Point Address:
  John Volckens, Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO 80523-1681, USA
• Email:
  john.volckens@colostate.edu
• Federal Fiscal Year:
  2011
• NORA Priority Area:
  Agriculture, Forestry and Fishing
• Performing Organization:
  Colorado State University - Fort Collins
• Peer Reviewed:
  True
• Start Date:
  20070801
• Source Full Name:
  Annals of Occupational Hygiene
• End Date:
  20100731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2ebd1b5453e957e49bbd758bda0c9a922b57aae912914a3883efe66ffbffd366772fb721116a496563f24266ceb638626d6dbf658e6fa504902dcd355d43920f
• Download URL:
  https://stacks.cdc.gov/view/cdc/191997/cdc_191997_DS1.pdf
• File Type:
  [PDF - 234.41 KB ]