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Dynamical Janssen effect

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Members: Y. Bertho, F. Giorgiutti, J.-P. Hulin


The apparent mass at the bottom of granular packing inside a vertical tube in relative motion is measured experimentally. We have demonstrated that, during the flow, a dynamical equilibrium is reached in the granular packing. We proved that Janssen's model is valid over a broad range of velocities and is verified even more precisely than in the static case. Moreover, a significant dependence on the relative humidity for the apparent mass has been demonstrated experimentally.



Granular medium inside a vertical tube in relative motion.
(left: top of the pile; right: bottom of the pile)



Publications

  • Influence of humidity on granular packings with moving walls [ Digital Object Identifier | PDF ]
    Y. Bertho, T. Brunet, F. Giorgiutti and J.-P. Hulin, Europhys. Lett. 67, 955-961 (2004)
  • Dynamiques d'écoulements gaz/particules en conduite verticale                           [ Digital Object Identifier | PDF ]
    Y. Bertho, Thèse de l'École Polytechnique (2003)
  • Dynamical Janssen effect on granular packing with moving walls [ Digital Object Identifier | PDF ]
    Y. Bertho, F. Giorgiutti and J.-P. Hulin, Phys. Rev. Lett. 90, 144301 (2003)