Investigation of a double shrouded probe for particle sampling in high velocity airflows

Abstract

An accurate forecast of the concentration of fine dust in the atmosphere is critical because of the negative public health impacts associated with high concentrations of particulate matter. To achieve an accurate forecast, large volumes of data need to be collected over a wide range of regions to act as forecast model boundary conditions. Therefore, the concentration of fine particles should be measured at both fixed observatories and from a range of moving monitoring stations, including cars, trains, and aviation vehicles. To accurately record particulate concentrations at flow velocities up to 200 km h(-1), this study proposed a double-shrouded probe design based on the widely used single-shrouded probe. Using the double-shrouded probe, isokinetic sampling for PM2.5 was achieved at velocities up to 200 km h(-1), and for PM10 at velocities up to 75 km h(-1). When flow velocities exceeded these values and particle sizes increased, particulate concentrations were overestimated. However, as compared to the single-shrouded probe, the double-shrouded probe reduced the level of overestimation markedly. (C) 2018 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.