Record Display for the EPA National Library Catalog

RECORD NUMBER: 24 OF 60

OLS Field Name OLS Field Data
Main Title Effects of Sampling Nozzles on the Particle Collection Characteristics of Inertial Sizing Devices.
Author Williamson, A. D. ; Farthing, W. E. ; Ward, T. E. ; Midgett, M. R. ;
CORP Author Southern Research Inst., Birmingham, AL.;Environmental Monitoring Systems Lab., Research Triangle Park, NC.
Year Published 1987
Report Number EPA-R-812274; EPA/600/D-87/167;
Stock Number PB87-191508
Additional Subjects Particle size ; Particulate sampling ; Stationary sources
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB87-191508 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 19p
Abstract
In several particle-sizing samplers, the sample extraction nozzle is necessarily closely coupled to the first inertial sizing stage. Devices of this type include small sampling cyclones, right angle impactor precollectors for in-stack impactors, and the first impaction stage of several cascade impactors. In a recent laboratory study of a stack sampling cyclone with various sampling nozzles, significant perturbations were observed in the actual D(sub 50) when some of the nozzles were used. Some nozzles caused the D(sub 50) of the cyclone to be reduced from 10 micrometers to less than 6 micrometers. Several alternate nozzle designs were considered to alleviate this behavior. Simple extension of the nozzle length was sufficient to restore the 10 micrometers sampler D(sub 50), but at the expense of enhanced deposition of the test aerosol particles on the nozzle walls.