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Computational simulation of worker exposure using a particle trajectory method.

Authors
Flynn-MR; Chen-M; Kim-T; Muthedath-P
Source
Ann Occup Hyg 1995 Jun; 39(3):277-289
NIOSHTIC No.
00227751
Abstract
A computational simulation of worker exposure using a particle trajectory method was developed. The time dependent air flow around a worker was computed by the discrete vortex method, improved to speed up calculations. The flow of air around a worker was calculated by modeling the worker as a two dimensional elliptical cylinder. The concentration of particles released into the two dimensional flow field was time averaged, as were the velocity fields. The numerical simulations developed captured the Strouhal number (shedding frequency) over a range of Reynolds numbers, but the eddy shape and size might not be simulated as well. Despite the limitations, reasonable concentrations were possible for the plane of the source and the breathing zone. Computer predicted concentrations produced excellent agreement with measurements of breathing zone concentrations obtained using a mannequin. The authors conclude that the method is limited because the flow around a worker is a three dimensional phenomenon; however, the results suggest that selection of the appropriate Lagrangian time scale and averaging over an appropriate computational breathing zone can minimize this drawback.
Keywords
NIOSH-Publication; NIOSH-Grant; Control-technology; Mathematical-models; Ventilation; Occupational-exposure; Air-quality-measurement; Airborne-particles; Time-weighted-average-exposure; Breathing-atmospheres; Dust-velocity
Contact
Environmental Sciences & Engr University of North Carolina CB 7400 Rosenau Chapel Hill, NC 27599-7400
CODEN
AOHYA3
Publication Date
19950601
Document Type
Journal Article
Funding Amount
463513.00
Funding Type
Grant
Fiscal Year
1995
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02858
Issue of Publication
3
ISSN
0003-4878
Priority Area
Grants Other
Source Name
Annals of Occupational Hygiene
State
NC
Performing Organization
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
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