Record Display for the EPA National Library Catalog

RECORD NUMBER: 32 OF 33

OLS Field Name OLS Field Data
Main Title Two-Stage Particle Fractionator Using Large Pore Nuclepore Surfaces.
Author Buzzard, Gale H. ; Parker, Richard D. ; Bell, John P. ;
CORP Author Duke Univ., Durham, NC.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1981
Report Number EPA-R-803018; EPA-600/2-81-107;
Stock Number PB82-110057
Additional Subjects Air filters ; Particle size ; Sampling ; Performance evaluation ; Deposition ; Reynolds number ; Air quality ; Air pollution sampling ; Numerical solution
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB82-110057 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 90p
Abstract
A fundamental study of the collection efficiency resulting from inertial deposition of particles onto large pore Nuclepore filters has been conducted. The theoretical procedure involved the solution of the Navier-Stokes equations for steady flow through a representative filter pore. Stokes' drag forces were applied to a particle in the flow field and used to determine its trajectory. The critical trajectory for deposition was found, and the collection efficiency was determined. The solutions were obtained numerically. The study was restricted to continuum flow and assumed negligible particle diffusion. The theory was used to investigate the influence of pore Reynolds number, particle density, filter thickness, and filter porosity upon the collection efficiency. Experimental collection efficiencies were obtained for laboratory generated particles. The filters were analyzed using optical fluorescence techniques. The experimental results obtained for a liquid aerosol are in good agreement with the theory and are viewed as validation of the impaction theory developed. The experimental results obtained for a solid aerosol fall well below the theoretical predictions and are viewed as an indication of particle bounce for a non-sticky aerosol.