Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Sampling efficiencies of personal particulate samplers, terminal progress report.

Authors
Willeke-K
Source
University of Cincinnati, Cincinnati Ohio, 1981 Nov; :1-3
Link
NIOSHTIC No.
00134962
Abstract
A newly designed inlet for a particulate air sampler was developed. The inlet was integrated into a modified optical single particle counter that recorded the aerosol concentration penetrating through the inlet. The efficiency of a 20 centimeter long thin walled sampling tube incorporating the inlet was evaluated in a wind tunnel. The device was tested at wind velocities of 250 to 1000 centimeters per second (cm/s) and inlet velocities of 125 to 1000cm/s, oriented at angles of 0 to 90 degrees to the air flow. Efficiency was significantly reduced when sampling was performed at an angle to the flow. When the sampling velocity in the inlet differed from the ambient wind velocity, sampling efficiency was significantly increased. For particles larger than 10 micrometers in diameter, sampling efficiency was affected by small angles. Orienting the inlet upwind at an angle of 15 degrees reduced efficiency, whereas downwind sampling at an angle of 15 degrees increased efficiency. For angles of 30 to 90 degrees, the sampling efficiency was a function of the Stokes number and the ratio of wind velocity to inlet velocity.
Keywords
NIOSH-Grant; Air-samplers; Measurement-equipment; Dust-particles; Employee-exposure; Exposure-levels; Airborne-particles; Analytical-instruments; Equipment-design
Publication Date
19811103
Document Type
Final Grant Report
Funding Amount
101468
Funding Type
Grant
Fiscal Year
1982
NTIS Accession No.
PB84-241454
NTIS Price
A01
Identifying No.
Grant-Number-R01-OH-00774
NIOSH Division
OEP
Source Name
University of Cincinnati, Cincinnati Ohio
State
OH
Performing Organization
Environmental Health University of Cincinnati 3223 Eden Avenue Cincinnati, Ohio 45267
TOP