Fundamental Investigation of Exhaust Hoods

Details

• Personal Author:
  Esmen NA ; Grauel TA ; Ilori AG ; Jossell S ; Parris A ; Weyel DA
• Description:
  This study investigated the theoretical aspects of airflow in front of freely suspended flanged hoods with arbitrarily, but symmetrically shaped hood orifices. Results indicated that an extension of the superimposition of two virtual sinks and potential flow assumption to describe the flow field can be used. The observed effect of turbulence on the capture efficiency of hoods and the magnitude of the reduction of the capture efficiency with what might be considered to be a relatively mild turbulent cross draft. Experimental data indicated that a turbulent cross draft in the order of 5 to 10% of the hood induced air speed in the mean velocity magnitude can reduced the overall capture efficiency of a hood by 15%. Using a conformal mapping technique, the theoretical investigations were also extended to include hoods with adjacent planes of arbitrary orientation. Optimization techniques which consider the hood geometry were investigated. The identified technique can be used to select hood orifice shape and dimensions not only to achieve proper control but also improve the mechanical efficiency of the process. [Description provided by NIOSH]
• Subjects:
  Air Movements Occupational Health Safety Ventilation
• Keywords:
  Air-flow Control-technology Exhaust-hoods NIOSH-Grant Ventilation-equipment Ventilation-systems
• Series:
  Grant Final Reports
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Final Grant Report
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• 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:
  1-114
• NIOSHTIC Number:
  nn:00197333
• NTIS Accession Number:
  PB91-173393
• Citation:
  Department of Industrial Environmental Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania 1990 Aug; :1-114
• Contact Point Address:
  Industrial Environ Health Scis University of Pittsburgh 130 Desoto Street Pittsburgh, PA 15261
• Federal Fiscal Year:
  1990
• NORA Priority Area:
  Research Tools and Approaches: Control Technology and Personal Protective Equipment
• Performing Organization:
  University of Pittsburgh at Pittsburgh, Pittsburgh, Pennsylvania
• Peer Reviewed:
  False
• Start Date:
  19850501
• Source Full Name:
  Department of Industrial Environmental Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
• End Date:
  19891231
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a03bfe43b49e198f975badb13c406c73040c7a906e194d93dc7d117b8ac299a1474e47b96c68d5f8ca6306037d67980e7f02aff8d2ac7ee3237ffe71fad715d2
• Download URL:
  https://stacks.cdc.gov/view/cdc/217789/cdc_217789_DS1.pdf
• File Type:
  [PDF - 2.60 MB ]