The wonderful world of granular ratchets

D. C. Rapaport

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


Computer simulation predicts that horizontal size segregation can be obtained in a vertically vibrated layer of granular material. This behavior is a consequence of two distinct phenomena that are unique to excited granular media: vibration which causes the large grains to rise to the top of the layer, and a vibrating base with a sawtooth surface profile which can produce stratified flows in opposite directions at different heights within the layer. The result of combining these effects is that large and small grains are horizontally driven in opposite directions.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalComputer Physics Communications
Issue number1-2
StatePublished - 1 Aug 2002
EventCCP 2001 - Aachen, Germany
Duration: 5 Sep 20018 Sep 2001

Bibliographical note

Funding Information:
Computer simulations employing a type of granular model whose viability has been established in other studies of grain flow have been used to investigate a novel mechanism for achieving size segregation. It remains to be seen whether the behavior of real granular matter is in accord with the predictions of these simulations. This research was supported in part by the Israel Science Foundation.


  • Granular segregation
  • Sawtooth base
  • Stratified flow
  • Vibrating layer


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