Particle collection efficiency for nylon mesh screens

Details

• Personal Author:
  Cena LG ; Ku B-K ; Peters TM
• Description:
  Nylon mesh screens, unlike metal screens, are attractive as a collection substrate for nanoparticles because they can be digested or ashed prior to chemical analysis. A theoretical single-fiber efficiency expression developed for wire-mesh screens was evaluated for estimating the collection efficiency of 11-300 nm particles for nylon mesh screens. Pressure drop across the screens, the effect of particle morphology (spherical and highly fractal-like) on collection efficiency, and single-fiber efficiency were evaluated experimentally for three pore sizes (60, 100, and 180 µm) at three flow rates (2.5, 4, and 6 Lpm). The pressure drop across the screens was found to increase linearly with superficial velocity. The collection efficiency of the screens was found to vary by less than 4% regardless of particle morphology. Single-fiber efficiency calculated from experimental data was in good agreement with that estimated from theory for particles between 40 and 150 nm but deviated from theory for particles outside this size range. New coefficients for the single-fiber efficiency model were identified that minimized the sum of square error (SSE) between the values estimated with the model and those determined experimentally. Compared to the original theory, the SSE calculated using the modified theory was at least one order of magnitude lower for all screens and flow rates with the exception of the 60-µm pore screens at 2.5 Lpm, where the decrease was threefold. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Occupational Health Particulate Matter Risk Assessment Risk Factors Safety
• Keywords:
  Airborne-particles Analytical-processes Measurement-equipment Nanotechnology Particle-aerodynamics Particle-counters Particulate-sampling-methods Particulates Quantitative-analysis Risk-factors Samplers Sampling Sampling-equipment Sampling-methods Statistical-analysis

  More +
• ISSN:
  0278-6826
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Iowa ; Ohio ; OSHA Region 5 ; OSHA Region 7
• 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:
  214-221
• Volume:
  46
• Issue:
  2
• NIOSHTIC Number:
  nn:20039710
• Citation:
  Aerosol Sci Technol 2012 Feb; 46(2):214-221
• Contact Point Address:
  Thomas M. Peters, Department of Occupational and Environmental Health, The University of Iowa Research Campus, 121 IREH, Iowa City, IA 52242-5000
• Email:
  thomas-m-peters@uiowa.edu
• Federal Fiscal Year:
  2012
• NORA Priority Area:
  Manufacturing
• Performing Organization:
  University of Iowa
• Peer Reviewed:
  True
• Start Date:
  20100901
• Source Full Name:
  Aerosol Science and Technology
• End Date:
  20130831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d730a916cfd636a38d85f9ff50352a0cd53e0b9e828e4676ce8c26d250cc6994a00ccd1ed29371f416287f77903bcb8e8d575a8a9fac06adde4676f1bdfca48d
• Download URL:
  https://stacks.cdc.gov/view/cdc/192852/cdc_192852_DS1.pdf
• File Type:
  [PDF - 653.59 KB ]