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Main Title Aerodynamic Classification of Fibers with Aerosol Centrifuges.
Author Martonen, T. B. ; Johnson., D. L. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. Environmental Toxicology Div. ;Army Environmental Hygiene Agency, Aberdeen Proving Ground, MD.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/506;
Stock Number PB91-199927
Additional Subjects Fibers ; Particle size distribution ; Aerodynamic characteristics ; Centrifuges ; Aerosols ; Respiratory system ; Mathematical models ; Laboratory tests ; Occupational safety and health ; Reprints ; Pulmonary deposition
Library Call Number Additional Info Location Last
NTIS  PB91-199927 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 19p
Abstract The constituent particles of many ambient and workplace aerosols of health effects concerns are of fibrous and aggregate geometric shapes. The sites of deposition in the human respiratory system are primarily related to the mass median aerodynamic diameters of inhaled particle size distributions. Therefore, to assess potential exposure hazards it is necessary to have accurate kinetic classifications of airborne particulate matter. Centrifugal spectrometers give direct and continuously graded measures of the aerodynamic size distributions of sampled aerosols. A mathematical description of particle behavior in spiral channel centrifuges has been presented, and substantiated by comparisons with laboratory calibration data using polystyrene latex spheres. Here, the theory is extended to non-spherical forms by incorporating appropriate dynamic particle shape resistance factors in trajectory equations. It is demonstrated how optimum centrifuge performance is made possible by the a priori determination of favorable operating conditions permitting high-resolution characterization; specifically for fibrous aerosols.
Supplementary Notes Pub. in Particulate Science and Technology, v8 n1-2 p37-53 Mar 90. Prepared in cooperation with Army Environmental Hygiene Agency, Aberdeen Proving Ground, MD.
NTIS Title Notes Journal article.
Title Annotations Reprint: Aerodynamic Classification of Fibers with Aerosol Centrifuges.
Category Codes 57U; 68G; 68A
NTIS Prices PC A03/MF A01
Primary Description 600/10
Document Type NT
Cataloging Source NTIS/MT
Control Number 122130835
Origin NTIS
Type CAT