Gas-driven subharmonic waves in a vibrated two-phase granular material.


Journal Article

Vibrated powders exhibit striking phenomena: subharmonic waves, oscillons, convection, heaping, and even bubbling. We demonstrate novel rectangular profile subharmonic waves for vibrated granular material, that occur uniquely in the two-phase case of grains, and a fluid, such as air. These waves differ substantially from those for the gas-free case, exhibit different dispersion relations, and occur for specific shaking parameters and air pressure, understandable with gas-particle flow models. These waves occur when the gas diffusively penetrates the granular layer in a time comparable to the shaker period. As the pressure is lowered towards P =0, the granular-gas system exhibits a Knudsen regime. This instability provides an opportunity to quantitatively test models of two-phase flow.

Full Text

Cited Authors

  • Matas, J-P; Uehara, J; Behringer, RP

Published Date

  • April 18, 2008

Published In

Volume / Issue

  • 25 / 4

Start / End Page

  • 431 - 438

PubMed ID

  • 18421417

Pubmed Central ID

  • 18421417

Electronic International Standard Serial Number (EISSN)

  • 1292-895X

International Standard Serial Number (ISSN)

  • 1292-8941

Digital Object Identifier (DOI)

  • 10.1140/epje/i2007-10310-5


  • eng