Bounceless high pressure drop cascade impactor and a method for

Measuring and testing – Sampler – sample handling – etc. – With constituent separation

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G01N 1502

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active

043876030

ABSTRACT:
A high pressure drop cascade impactor wherein particles do not bounce from the collection plate; to a method for designing said impactor; a method for calculating and determing the particle size distribution of an aerosol wherein the particle size may have a Stokes (aerodynamic) diameter as small as 10 nanometers; and, to a method of manufacturing such an impactor. Particles drawn through the impactor exhibit substantially no reentrainment, or bounce, from the collection of surfaces. The impactor eliminates turbulence near the entrances to the jet holes by rounding the edges of the jet holes. This is accomplished on the small holes by means of electropolishing. The impactor is capable of capturing particles as small as 10 nanometers Stokes (aerodynamic) diameter.

REFERENCES:
patent: 3001914 (1961-09-01), Anderson
patent: 3528279 (1970-09-01), Lasseur et al.
patent: 3693457 (1962-09-01), Pilat
patent: 3771291 (1973-11-01), Klinger
patent: 3795135 (1974-03-01), Anderson
patent: 3983743 (1976-10-01), Olin et al.
patent: 4189937 (1980-02-01), Nelson
Holland et al. "Three Multistage Stack Samplers" Chemical Engineering Progress vol. 69, No. 6, pp. 93-95, Jun. 1973.

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