ON THE SAMPLING EFFICIENCY OF A LARGE DOWNWARD INLET AEROSOL SAMPLER

Authors
  1. Roy, G.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A computer simulation has been used to calculate the sampling efficiency of a downward-facing aerosol sampler having a large entrance aperture. Flow-field calculations have been done by solving the Laplace equation for a flat disk with uniform air velocity over its surface. Initial positions from which particles reach an equilibrium position at which the sedimentation speed equals the air suction speed of the sampler are obtained by iterative solution of the equations of motion. These distances are time-independent and are called critical distances. The time-dependent sampling efficiency is obtained by combining critical distances with the sampler interaction distance for a given sample volume of air. The effect on sampling efficiency of various parameters such as the sampling flow rate, sampling period, height of the aerosol above the filter, and rim size is evaluated.
Keywords
Air flow;Air filters
Report Number
DREV-4399/86 —
Date of publication
15 May 1986
Number of Pages
38
DSTKIM No
86-02516
CANDIS No
97225
Format(s):
Hardcopy;Originator's fiche received by DSIS

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