Gas-induced fluidization of mobile liquid-saturated grains

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Gabriel RamosValérie Vidal

Abstract

Gas invasion in liquid-saturated sands exhibits different morphologies and dynamics. For mobile beds, the repeated rise of gas through the layer leads to the growth of a fluidized zone, which reaches a stationary shape. Here, we present experimental results characterizing the evolution of the fluidized region as a function of the gas-flow rate and grain size. We introduce a new observable, the flow density, which quantifies the motion of the grains in the system. The growth of the fluidized zone is characterized by a spatiotemporal analysis, which provides the stabilization time, τ_{s}. In the stationary regime, we report two main contributions to motion in the fluidized region: the central gas rise and a convective granular motion. Interestingly, a static model with a fixed porous network accounts for the final shape of the invasion zone. We propose an explanation where the initial gas invasion weakens the system and fixes since the early stage the morphology of the fluidized zone.

References

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Mar 17, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Germán VarasJean-Christophe Géminard
Jul 30, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Germán VarasJean-Christophe Géminard
May 18, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·P Philippe, M Badiane

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Citations

Feb 27, 2019·Lab on a Chip·Morgane HoussaisJeffrey F Morris
Apr 15, 2016·Physical Review. E·Raphaël PorylesGermán Varas
Jul 16, 2017·Physical Review. E·Raphaël PorylesValérie Vidal
Jan 20, 2018·Physical Review. E·C MorizeA Sauret

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