The effect of particle shape on powder properties

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Abstract
Sand in the size ranges 18–20 mesh, 30–36 mesh and 44–60 mesh has been separated by means of a vibratory shape-sorting table into fractions of different shape. The ratios of the surface area of the particles to their volumes-the shape coefficients-ranged from 8 to 15. For each fraction the following properties were measured: angle of repose, bulk density and rate of flow through an orifice. In all cases, with increasing departure from the spherical, the angle of repose increased, whilst the bulk density and flowability decreased. Improved methods are reported for the measurement of bulk density, angle of repose and specific surface area in the range 30–130 cm2/g.

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