Flow dynamics and contaminant transport in industrial-type enclosing exhaust hoods

Details

• Personal Author:
  Celik I ; Guffey SE ; Karaismail E
• Description:
  The present study concerns the flow dynamics and associated contaminant transport in the near wake of a worker using an industrial-type benchtop enclosing hood. The primary focus is on evaluating the effects on the dynamics of the wake flow and the exposure level of various extraneous factors, such as the strength and direction of cross-drafts and the worker's body heat and shape. Three-dimensional Unsteady Reynolds-Averaged Navier-Stokes simulations were carried out for a model of a simple mannequin and a model of an anthropometric mannequin. Estimated flow patterns and concentrations near the simple mannequin were compared with the observations from concurrent smoke visualization experiments and with the experimental concentration measurements, respectively. Results for both visualizations indicated that the flow in front of the worker is dominated by dynamic vortical structures and that body heat may have negative effects on the exposure level, especially at low flow rates. Using simple rounded shapes to simulate the human form was a fair approximation from the viewpoint of flow structures and exposure trends, which agreed well with the experimental measurements and observations. However, the quantitative values of the predicted concentrations in the breathing zone were sensitive to the mesh resolution. [Description provided by NIOSH]
• Subjects:
  Air Movements Air Pollutants, Occupational Air Pollution, Indoor Body Temperature Environmental Exposure Environmental Monitoring Occupational Health Particulate Matter Safety Ventilation
• Keywords:
  Air-contamination Air-flow Anthropometry Author Keywords: Contaminant Transport Body-temperature Breathing-zone Enclosing Exhaust Hoods Environmental-control-equipment Environmental-exposure Exhaust-hoods Exposure-assessment Exposure-levels Measurement-equipment Models Particle-aerodynamics Quantitative-analysis Simulation-methods Transport-mechanisms Ventilation-hoods Visual-images Wake Flow

  More +
• ISSN:
  1545-9624
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  New York ; OSHA Region 2 ; OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  384-396
• Volume:
  10
• Issue:
  8
• NIOSHTIC Number:
  nn:20042956
• Citation:
  J Occup Environ Hyg 2013 Jul; 10(7):384-396
• Contact Point Address:
  Ertan Karaismail, Rensselaer Polytechnic Institute, Scientific Computation Research Center, 110 8th Street, Troy, NY 12180
• Email:
  karaie@rpi.edu
• Federal Fiscal Year:
  2013
• Performing Organization:
  West Virginia University
• Peer Reviewed:
  True
• Start Date:
  20060801
• Source Full Name:
  Journal of Occupational and Environmental Hygiene
• End Date:
  20101231
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6d1ab66a1d593d6bac28e3946fd0b1894def165f146a9cb69c5abbad7d997e0938610e19e6f3ff5d6aeb8d03acc306dff55b09c72a04236ef79e910893b02491
• Download URL:
  https://stacks.cdc.gov/view/cdc/195005/cdc_195005_DS1.pdf
• File Type:
  [PDF - 1.42 MB ]