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Velocity and orientation effects on the 10-mm Dorr-Oliver cyclone.

Authors
Cecala-AB; Volkwein-JC; Timko-RJ; Williams-KL
Source
USBM 1983 Apr; :1-11
Link
NIOSHTIC No.
10002807
Abstract
The Bureau of Mines conducted a brief laboratory study on the 10-mm-diam Dorr-Oliver nylon cyclone to investigate (1) whether high wind speed (>300 ft/min), or sampler inlet orientation with respect to wind direction, can introduce errors when sampling respirable dust, and (2) whether any such errors can be reduced by using an inlet shield. Photometric mass sensing measurements suggested that as the wind velocity increased, the cyclone sampling directly into the high-velocity airstream tended to oversample, relative to the cyclone sampling in a low-velocity airstream. Orientation of the sampler introduced measurable differences in sampling efficiency at higher wind velocities. A shield placed around the cyclone diminished the effects of wind velocity and sampler orientation on sampler performance. Results of this work offer sufficient evidence to substantiate the need for a more in-depth study.
Keywords
Samplers; Sampling-equipment; Mining-industry; Respirable-dust; Sampling-methods; Airborne-dusts
Publication Date
19830401
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
PB83-214387
NTIS Price
Identifying No.
RI-8764
NIOSH Division
PRC
Source Name
U.S. Bureau of Mines
State
PA
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