Measurements of Grain Motion in a Dense, Three-Dimensional Granular Fluid

Xiaoyu Yang, Chao Huan, D. Candela, R. W. Mair, and R. L. Walsworth
Phys. Rev. Lett. 88, 044301 – Published 8 January 2002
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Abstract

We have used an NMR technique to measure the short-time, three-dimensional displacement of grains in a system of mustard seeds vibrated vertically at 15g. The technique averages over a time interval in which the grains move ballistically, 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 longer than the particle diameter and the hydrodynamic description fails.

  • Received 16 August 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.044301

©2002 American Physical Society

Authors & Affiliations

Xiaoyu Yang, Chao Huan, and D. Candela

  • Physics Department, University of Massachusetts, Amherst, Massachusetts 01003

R. W. Mair and R. L. Walsworth

  • Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138

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Vol. 88, Iss. 4 — 28 January 2002

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