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The Effect of Pulsation Damping on Respirable Dust Collected by Coal Mine Dust Personal Samplers.

Authors
Lamonica-JA; Treaftis-HN
Source
NTIS: PB 210 169 :23 pages
Link
NIOSHTIC No.
10008876
Abstract
The Bureau of Mines studied two types of approved coal mine dust personal samplers to determine the effect of decreasing the amplitude of airflow velocity fluctuations on cyclone performance. Results indicate that more dust is collected when pulsation free flow is used. Velocity fluctuations were reduced by means of a pulsation damper; damper efficiency of about 85 percent was needed to reduce the fluctuations to an acceptable level. The data were obtained employing both pulsating and nonpulsating flow. A comparison was made of (1) the masses of respirable coal dust as determined by weighing and of (2) the particle size distributions as determined by an electronic counter. An empirical relationship is given between the ratio of masses collected using pulsating and nonpulsating flow (m') and the ratio of the maximum air velocity to the minimum air velocity (v') as measured in the cyclone entrance channel.
Publication Date
19720101
Document Type
IH; Report of Investigation;
Fiscal Year
1972
NTIS Accession No.
PB-210169
NTIS Price
A03
Identifying No.
RI 7636
Source Name
NTIS: PB 210 169
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