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A parallel-plate electrostatic size classifier for aerosol particles.
Schowengerdt-FD; Brown-JT Jr.
Rev Sci Instrum 1980 Aug; 51(8):1098-1104
The construction, analysis and testing of a parallel plate electrostatic aerosol size classifier were reviewed. The instrument was able to produce submicron aerosols with high output, good resolution in the size distribution, and of either single or mixed charge polarities. Monodisperse latex spheres and polydisperse coal dust samples were used in performance tests. Five different sizes of monodisperse latex spheres were passed through the classifier. For each size the plate potential was varied over the entire range while the output aerosol concentrations were measured. The input aerosol was generated from an aqueous suspension in a nebulizer, dried by clean sheath air, then passed through the neutralizer. The output of the generator was monitored with the Active Scattering Aerosol Analyzer (ASAA) to ensure long term source stability. The experimental results were quite good with the agreement between theory and experimental data differing by less than 7 percent. The most likely experimental sources of error would be fringing fields in either the electric field or the flow fields, turbulence at the slits or errors in the flow rate measurements. In the coal dust experiments there were no detectable differences between the response to coal dust and to latex. A size resolution of about 13 percent for monodisperse aerosols and 17 percent for a polydisperse coal dust aerosol was obtained.
NIOSH-Publication; NIOSH-Grant; Control-technology; Aerosol-sampling; Coal-dust; Dust-sampling; Air-sampling
Physics Colorado School of Mines Department of Physics Golden, Colo 80401
Issue of Publication
Review of Scientific Instruments
Colorado School of Mines, Golden, Colorado
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division