Aerodynamics and exposure variability.

Details

• Personal Author:
  Flynn MR ; George DK
• Description:
  Exposure levels and how orientation of the body with respect to air flow direction affect mean exposure were investigated in wind tunnel studies with a mannequin and sulfur-hexafluoride as a tracer gas. The mannequin was 41 inches high, and air velocities of 49, 152 and 265 feet per minute were used. Using a point source of tracer gas indicated that locating a contaminant source within a separated boundary layer results in greater exposure variability than when the source is outside such a region. These results provide information for estimating the relative exposure variability between processes under different aerodynamic conditions. While these findings focus on worker position as the generator of such a separated region, such examples will occur in any instance where there is relative motion between the air and a bluff body. Work occurring in large recirculating eddies formed by air movement around machines, or internal walls and boundaries will likely result in greater exposure variability when the pollutant source is within such a zone. The number of measurements needed to evaluate exposure is likely to be greater for such situations. This should serve as a crude guide to help industrial hygienists identify situations of high exposure variability on a relative basis. [Description provided by NIOSH]
• Content Notes:
  in NTRL, no pdf
• Subjects:
  Air Movements Air Pollutants, Occupational Air Pollution, Indoor Occupational Health Safety Ventilation Workplace
• Keywords:
  NIOSH-Grant; Control-technology; Air-flow; Fluid-mechanics; Work-environment; Ventilation-systems; Air-contamination
• Series:
  Grant Final Reports
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Final Grant Report
• Place as Subject:
  North Carolina ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OEP - Office of Extramural Programs
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-12
• NIOSHTIC Number:
  nn:00198533
• NTIS Accession Number:
  PB91197517
• Citation:
  Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 1990 Feb; :1-12
• Contact Point Address:
  Environmental Sciences & Engr University of North Carolina Rosenau Hall 201H Chapel Hill, NC 27514
• Federal Fiscal Year:
  1990
• NORA Priority Area:
  Research Tools and Approaches: Control Technology and Personal Protective Equipment
• Performing Organization:
  University of North Carolina Chapel Hill, Chapel Hill, North Carolina
• Peer Reviewed:
  False
• Start Date:
  19870929
• Source Full Name:
  Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
• End Date:
  19890928
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
• Download URL:
  https://stacks.cdc.gov/view/cdc/246228/cdc_246228_DS1.pdf
• File Type:
  [PDF - 168.02 KB ]