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Chimney of Fluidization and “Sandboil” in a Granular Soil

  • P. PhilippeEmail author
  • M. Badiane
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG, volume 11)

Abstract

In this paper, we report experimental results on the development in an immersed granular bed of a fluidized zone under the effect of a confined liquid flow upward. For this, two optical techniques (index-matching and laser induced fluorescence) have been combined to visualize the interior of a model granular medium made of glass beads. For small flow rates, the bed remains static while it gets fluidized in a vertical chimney at larger flow rates. For intermediate flow rates, a fluidized cavity can be observed in the vicinity of the injection hole. This cavity can either reach a steady-state or progressively expand up to the top at a small speed. The stability of such a cavity reveals a strong hysteretic behavior depending on whether the flow rate increases until fluidization or decreases after fluidization. We present here some characteristics of the phenomenon: phase diagram, regime of stable fluidized cavity, kinematics of fluidization front.

Keywords

Fluidization Instability Sandboil Granular medium Refractive index matching 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.CEMAGREF d’Aix en ProvenceAix en Provence Cedex 5France

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