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.
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Philippe, P., Badiane, M. (2011). Chimney of Fluidization and “Sandboil” in a Granular Soil. In: Bonelli, S., Dascalu, C., Nicot, F. (eds) Advances in Bifurcation and Degradation in Geomaterials. Springer Series in Geomechanics and Geoengineering. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1421-2_16
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DOI: https://doi.org/10.1007/978-94-007-1421-2_16
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