Abstract
THE attention which J. D. Bernal1 has directed to the importance of geometrical models for representing the structure of liquids has elicited considerable recent interest in the packing of spheres2–7. While previous investigations were often concerned with the dense random state8,9, some of the more recent work has been devoted to looser states3,4,6. Both Scott3 and MacRae and Gray4 obtained loose deposits of spheres by a rolling procedure, while Rutgers6, in common with Leva et al.10 some years earlier, obtained a loose packing by dumping or pouring. Porosities thus reported, though significantly higher than those found in the dense random state, are nevertheless still lower than those obtained either by rapidly inverting a cylinder11 or by gradually diminishing to zero the gas (or liquid) flow through a fluidized bed12,13. It is the latter porosities which correspond to those observed in both moving packed14 and incipiently fluidized13 beds.
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References
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EPSTEIN, N., YOUNG, M. Random Loose Packing of Binary Mixtures of Spheres. Nature 196, 885–886 (1962). https://doi.org/10.1038/196885a0
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DOI: https://doi.org/10.1038/196885a0
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