Calibration and field application of a Sierra Model 235 cascade impactor

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · Am. Ind. Hyg. Assoc. J.; (United States)

DOI:https://doi.org/10.1080/15298668491400007· OSTI ID:5764425

Knuth, R H

A Sierra Model 235 slotted impactor was used to measure the particle size distribution of ore dust in uranium concentrating mills. The impactor was calibrated at a flow rate of 0.21 m/sup 3//min, using solid monodisperse particles of methylene blue and an impaction surface of Whatman number41 filter paper soaked in mineral oil. The reduction from the impactor's design flow rate of 1.13 m/sup 3//min (40 cfm) to 0.21 m/sup 3//min (7.5 cfm), a necessary adjustment because of the anticipated large particle sizes of ore dust, increased the stage cut-off diameters by an average factor of 2.3. Evaluation of field test results revealed that the underestimation of mass median diameters, often caused by the rebound and reentrainment of solid particles from dry impaction surfaces, was virtually eliminated by using the oiled Whatman number41 impaction surface.

• Research Organization: Dept. of Energy, New York, NY
• OSTI ID: 5764425
• Journal Information: Am. Ind. Hyg. Assoc. J.; (United States), Journal Name: Am. Ind. Hyg. Assoc. J.; (United States) Vol. 45:6; ISSN AIHAA
• Country of Publication: United States
• Language: English

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