Abstract
Measurements of the packing of spherical particles poured into a cylindrical container show that the intensity of deposition, the height of drop and the elasticity of the particle material influence the packing equally. Minor departures from perfect sphericity tend to mask the influence of elasticity. Optimum packing of poured spherical particles occurs when the energy increment imparted to the bed by each impacting particle exceeds a critical value, the rate of renewed application of increments is above a critical value and the intensity of deposition is below a critical level. Within a critical range of deposition conditions, sufficient energy may be imparted to spherical particles to activate a process of ordered packing, initiated at a wall. These conditions are fulfilled when 0.125 in. diameter spheres fill a 3 in. diameter glass cylinder at 1400 particles per second with impact velocities greater than 120/{½(1 + em)}12 in/s, em being the resilience of the particle material. Determinations of wall effect show that these conclusions and the derived mechanism of packing are valid for the packing of an infinitely extensive bed.
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