QUALITATIVE AND QUANTITATIVE WIND-TUNNEL MEASUREMENTS OF THE AIR-FLOWTHROUGH A SHROUDED AIRBORNE AEROSOL SAMPLING PROBE

In this paper, we present the results of a series of wind tunnel tests of the airflow through a shrouded probe designed by Ram ct al. (1995, J. Aerosol. Sci. 26, 945-962) for high velocity airborne sampling of insoluble aerosol particles in the size range 0.1-15 mu m diameter. Te sts included flow visualization using a laser light-sheet and hot wire anemometry measurements of air velocity profiles within the shroud up stream of the sampling probe with the probe operating at angles of att ack from 0 to 15 degrees. We discuss the effectiveness of the shroud i n making the flow into the probe isoaxial for situations where the sam pler is at small angles of attack and comment on the role of the shrou d as an effective flow decelerator. We conclude by comparing the wind tunnel measurements with numerical simulation studies of the airflow t hrough the sampler at 0 degrees angle of attack. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.