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Particle collection efficiency for nylon mesh screens.

Authors
Cena-LG; Ku-BK; Peters-TM
Source
Aerosol Sci Tech 2012 Feb; 46(2):214-221
NIOSHTIC No.
20039710
Abstract
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 Ám) 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-Ám pore screens at 2.5 Lpm, where the decrease was threefold.
Keywords
Airborne-particles; Analytical-processes; Measurement-equipment; Nanotechnology; Particle-aerodynamics; Particle-counters; Particulates; Particulate-sampling-methods; Quantitative-analysis; Risk-factors; Statistical-analysis; Sampling-equipment; Sampling-methods; Samplers; Sampling
Contact
Thomas M. Peters, Department of Occupational and Environmental Health, The University of Iowa Research Campus, 121 IREH, Iowa City, IA 52242-5000
CODEN
ASTYDQ
Publication Date
20120201
Document Type
Journal Article
Email Address
thomas-m-peters@uiowa.edu
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B10122011
Issue of Publication
2
ISSN
0278-6826
NIOSH Division
DART
Source Name
Aerosol Science and Technology
State
OH; IA
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