A Dense, Vibrated Granular Fluid in Gravity: NMR Measurements of Grain Motion in Three Dimensions

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  • 16 August 2001
Abstract
We have used NMR techniques to measure the short-time, three-dimensional displacement of grains in a system of mustard seeds vibrated vertically at 15g. The observation interval is in the ballistic regime, giving a direct measurement of the granular temperature profile. The dense, lower portion of the sample is well described by a recent hydrodynamic theory for inelastic hard spheres. Near the free upper surface the mean free path is much longer than the particle diameter and the hydrodynamic description breaks down.

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