Computational simulation of worker exposure using a particle trajectory method

Details

• Personal Author:
  Chen M ; Flynn MR ; Kim T ; Muthedath P
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Dust Environmental Monitoring Occupational Exposure Occupational Health Particulate Matter Safety Ventilation
• Keywords:
  Air-quality-measurement Airborne-particles Breathing-atmospheres Control-technology Dust-velocity Mathematical-models NIOSH-Grant NIOSH-Publication Occupational-exposure Time-weighted-average-exposure
• ISSN:
  0003-4878
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  North Carolina ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  277-289
• Volume:
  39
• Issue:
  3
• NIOSHTIC Number:
  nn:00227751
• Citation:
  Ann Occup Hyg 1995 Jun; 39(3):277-289
• Contact Point Address:
  Environmental Sciences & Engr University of North Carolina CB 7400 Rosenau Chapel Hill, NC 27599-7400
• Federal Fiscal Year:
  1995
• NORA Priority Area:
  Grants Other
• Performing Organization:
  University of North Carolina Chapel Hill, Chapel Hill, North Carolina
• Peer Reviewed:
  True
• Start Date:
  19910701
• Source Full Name:
  Annals of Occupational Hygiene
• End Date:
  20010630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f4123a450199386bb244947d677783f46d49b733af56caaf7c3a3c7536bf52526cdd71225ff3d3fa85d114c5c9c3560bb20d968ec8d48ed557512824122d5f6f
• Download URL:
  https://stacks.cdc.gov/view/cdc/204388/cdc_204388_DS1.pdf
• File Type:
  [PDF - 588.23 KB ]