Diffusion and mobility in a stirred dense granular material.


Journal Article

We describe a probe of diffusivity (D) and mobility (B) for a dense 2D granular system. We introduce random motion by stirring, and characterize D by particle tracking. To measure B we measure the force needed to push a particle through the medium at fixed velocity, v, using three sizes of tracer particle. We find simple Brownian diffusion, but B depends strongly on v because the force needed to push a tracer through a sample is nearly independent of v. Data for D/B depend on the tracer particle size.

Full Text

Cited Authors

  • Geng, J; Behringer, RP

Published Date

  • December 2, 2004

Published In

Volume / Issue

  • 93 / 23

Start / End Page

  • 238002 -

PubMed ID

  • 15601205

Pubmed Central ID

  • 15601205

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.93.238002


  • eng