Abstract
Previous studies (Marshall et al. , 1991; Marshall and Mitchell, 1991) have shown that time-of-flight aerodynamic particle sizers, such as the TSI Aerodynamic Particle Sizer and the Amherst Process Instruments Aerosizer, underestimate the aerodynamic size of cubeshaped particles, since they operate under ultra-Stokesian flow conditions. The present work has extended the investigation to include an assessment of the behaviour of two sizes of monodisperse, prolate spheroidal, ferric oxide particles close to 2 μm aerodynamic diameter in both instruments. Both techniques undersized the smaller particles significantly, but the larger particles (more elongated) were oversized by the Aerodynamic Particle Sizer and undersized marginally by the Aerosizer. Similar behaviour was reported by Griffiths et al ., (1984) with micron-sized glass fibres sampled by an earlier version of the Aerodynamic Particle Sizer.
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