Granular Matter

, Volume 7, Issue 4, pp 191–197 | Cite as

Localized instability of a granular layer submitted to an ascending liquid flow

  • P. Rigord
  • A. Guarino
  • V. Vidal
  • J.-C. Géminard


Using a very simple experimental setup, we study the response of a thin layer of immersed granular material to an ascending liquid-flow; a pressure difference Δ P is imposed between the two horizontal free surfaces of a thin layer of glass beads, such that the liquid tends to flow upwards, and the resulting flow-rate v is measured. As generally observed in fluidized beds, the layer destabilizes when the pressure force exactly compensates the weight of the grains. At the free surface, one then observes the formation of a localized fountain of granular material the characteristic size of which is found to be proportional to the grain size and, surprizingly, independent of both the flow-rate and the thickness of the granular layer. Simple theoretical arguments account for the main experimental features.


Fluidized beds Instability Flow localization 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • P. Rigord
    • 1
  • A. Guarino
    • 2
  • V. Vidal
    • 3
    • 4
  • J.-C. Géminard
    • 1
    • 4
  1. 1.Laboratoire de PhysiqueEcole Normale Supérieure de Lyon, 46 Allée d'ItalieFrance
  2. 2.Université de la Polynésie FrançaiseTahitiFrançaise
  3. 3.Institut de Physique du Globe 75252 Paris cedex 05France
  4. 4.Nonlinear Physics LaboratoryUniversidad de Santiago de ChileSantiagoChile

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