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Aerodynamics and Exposure Variability.

Authors
Flynn-MR; George-DK
Source
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 1990 Feb:12 pages
Link
NIOSHTIC No.
00198533
Abstract
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.
Keywords
NIOSH-Grant; Control-technology; Air-flow; Fluid-mechanics; Work-environment; Ventilation-systems; Air-contamination;
Contact
Environmental Sciences & Engr University of North Carolina Rosenau Hall 201H Chapel Hill, NC 27514
Publication Date
19900201
Document Type
Final Grant Report;
Funding Amount
113206.00
Funding Type
Grant;
Fiscal Year
1990
NTIS Accession No.
PB91-197517
NTIS Price
A03
Identifying No.
Grant-Number-R01-OH-02392
NIOSH Division
OEP
Priority Area
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Source Name
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
State
NC;
Performing Organization
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
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