Effects of Air on the Segregation of Particles in a Shaken Granular Bed

X. Yan, Q. Shi, M. Hou, K. Lu, and C. K. Chan
Phys. Rev. Lett. 91, 014302 – Published 3 July 2003

Abstract

Effects of interstitial air on the motions of a large intruder in a shaken granular bed are studied experimentally as a function of ambient air pressure, particle size of the bed, and the density of the intruder. It is found that the intruder always rises from the granular bed in the absence of air. However, the intruder can acquire both positive and negative buoyancy in the presence of air. Negative buoyancy can be observed only when both the density of the intruder and the particle size of the bed are small enough. This negative buoyancy can be explained by the unusual air pressure distribution found in the bed.

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  • Received 31 December 2002

DOI:https://doi.org/10.1103/PhysRevLett.91.014302

©2003 American Physical Society

Authors & Affiliations

X. Yan1,2, Q. Shi1,2, M. Hou1, and K. Lu1,*

  • 1Institute of Physics, Chinese Academy of Sciences, Beijing 100080
  • 2Department of Physics, Beijing Institute of Technology, Beijing 100081

C. K. Chan

  • Institute of Physics, Academia Sinica, NanKang Taipei 115

  • *To whom correspondence should be addressed. Electronic address: lukq@aphy.iphy.ac.cn

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Vol. 91, Iss. 1 — 4 July 2003

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