Instabilities in a Liquid-Fluidized Bed of Gas Bubbles

Vera, M. U; Saint‐Jalmes, Arnaud; Durian, Douglas J.

doi:10.1103/physrevlett.84.3001

Cited by 38 publications

(20 citation statements)

References 17 publications

(26 reference statements)

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“…All the results presented before were for foams with ε 0 between 0.04 and 0.10. For very-high-liquid-fraction foams (ε > 0.15−0.20), forced drainage cannot be studied because of front instabilities [6,35]. Thanks to our foam production apparatus, we can create and study free drainage of such wet foams ( figure 10).…”

Section: High Wetnessmentioning

confidence: 99%

Time evolution of aqueous foams: drainage and coarsening

Saint‐Jalmes

Langévin

2002

J. Phys.: Condens. Matter

133

109

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We report new results on drainage and coarsening of aqueous foams. We show that these two effects can strongly interfere, enhancing the drainage velocity. Without coarsening, we have performed free-drainage experiments, in which local drainage rates are measured by electrical conductivity and by light scattering techniques. We have investigated the roles of the bubble size, of the surface and bulk rheology and of the liquid fraction. The results show that changing these foam parameters can induce transitions between different drainage regimes. The results are analysed in terms of two dimensionless numbers describing the balance between surface and bulk dissipation.

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Section: High Wetnessmentioning

confidence: 99%

Time evolution of aqueous foams: drainage and coarsening

Saint‐Jalmes

Langévin

2002

J. Phys.: Condens. Matter

133

109

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“…Fan and Tsuchiya [7] investigated the bubble wake in liquid-solid suspensions and showed that the wake size is sensitive to the extent of the disturbance in the liquid flow caused by the presence of the particles. Vera et al [11] studied the instabilities of gas bubbles in a liquid-fluidized bed and described the series of instabilities induced by a downward liquid flow through a foam of bubbles. Some researchers have proposed correlations for bubble rise velocity in liquid-solid suspensions [12].…”

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confidence: 99%

Dynamics of Single Rising Bubbles in Neutrally Buoyant Liquid-Solid Suspensions

et al. 2013

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We experimentally investigate the effect of particles on the dynamics of a gas bubble rising in a liquidsolid suspension while the particles are equally sized and neutrally buoyant. Using the Stokes number as a universal scale, we show that when a bubble rises through a suspension characterized by a low Stokes number (in our case, small particles), it will hardly collide with the particles and will experience the suspension as a pseudoclear liquid. On the other hand, when the Stokes number is high (large particles), the high particle inertia leads to direct collisions with the bubble. In that case, Newton's collision rule applies, and direct exchange of momentum and energy between the bubble and the particles occurs. We present a simple theory that describes the underlying mechanism determining the terminal bubble velocity.

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“…Thus, the transition in liquid fraction between the upper dry layer and the lower wet layer was more gradual than the step change in the pressure gradient would suggest. Furthermore, even when uniformly fluidised, the wet lower froth layer was at times sufficiently wet to produce circulatory instabilities (as observed by Vera et al [21]). However, there was no evidence that buoyancy-driven froth motions actually caused mixing between the wet froth and the underlying liquid layer or the overlying dry froth layer.…”

Section: Resultsmentioning

confidence: 88%