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Screen Collection Efficiency of Airborne Fibers with Monodisperse Length

Public Domain


Details

  • Personal Author:
  • Description:
    Fiber length is believed to be an important variable in determining various toxicological responses to asbestos and other elongate mineral particles. In this study we investigated screen collection characteristics using monodisperse-length glass fibers (i.e., 11, 15, 25, and 53 um in length), to better understand the collection of fibers with different lengths on screens with different mesh sizes. A well-dispersed aerosol of glass fibers (geometric mean length approsimately 20 um), generated by vortex shaking, was fed directly into the Baron Fiber Length Classifier, in order to produce monodisperse length fibers. With nylon mesh screens (10, 20, 30, 41 and 60 um mesh sizes), the screen collection efficiency was measured using an aerodynamic particle sizer. As the screen mesh size decreases from 60 um to 10 um, the screen collection efficiency for 53 um fibers increases (from 0.3 to 0.9) while 11 um fibers exhibited a collection efficiency independent of screen mesh size. The collection efficiency for the longest fibers was found to be nearly constant for aerodynamic diameters 1-4 im for screens 20 and 30 um, but to rise significantly at aerodynamic diameters larger than 4 um. For the 20 um screen, the collection efficiency for fibers with lengths>20 um is a factor of two to five larger than that for spherical particles with the same aerodynamic diameter. We believe that fibers are collected on the screen primarily by interception below 4 um in aerodynamic diameter, and by impaction above 4 um. This study represents a fundamental advance in the understanding of the interaction of screens with a fibrous aerosol. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0021-8502
  • Document Type:
    Text
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    DART - Division of Applied Research and Technology
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    250-262
  • Volume:
    114
  • NIOSHTIC Number:
    nn:20050502
  • Citation:
    J Aerosol Sci 2017 Dec; 114:250-262
  • Contact Point Address:
    Bon Ki Ku, Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH), Division of Applied Research and Technology (DART), 1090 Tusculum Ave, MS-R7, Cincinnati, OH 45226
  • Email:
    bku@cdc.gov
  • Federal Fiscal Year:
    2018
  • NORA Priority Area:
  • Peer Reviewed:
    True
  • Source Full Name:
    Journal of Aerosol Science
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:eb2df5f8e5aa8dc0904fc7ba5c3129130e88c6c39b3cca73dc6e659d224bed5720da72f9f954e707915f0c3033782ba067ac99019b0e8d1236bc39ffc1cced95
  • Download URL:
  • File Type:
    Filetype[PDF - 761.24 KB ]
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