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- W3100847470 abstract "The most efficient way to pack equally sized spheres isotropically in 3D is known as the random close packed state, which provides a starting point for many approximations in physics and engineering. However, the particle size distribution of a real granular material is never monodisperse. Here we present a simple but accurate approximation for the random close packing density of hard spheres of any size distribution, based upon a mapping onto a one-dimensional problem. To test this theory we performed extensive simulations for mixtures of elastic spheres with hydrodynamic friction. The simulations show a general (but weak) dependence of the final (essentially hard sphere) packing density on fluid viscosity and on particle size, but this can be eliminated by choosing a specific relation between mass and particle size, making the random close packed volume fraction well-defined. Our theory agrees well with the simulations for bidisperse, tridisperse and log-normal distributions, and correctly reproduces the exact limits for large size ratios." @default.
- W3100847470 created "2020-11-23" @default.
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- W3100847470 date "2009-12-28" @default.
- W3100847470 modified "2023-10-12" @default.
- W3100847470 title "Close packing density of polydisperse hard spheres" @default.
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- W3100847470 doi "https://doi.org/10.1063/1.3276799" @default.
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