Foams in a rotating drum: An analogy with granular materials

Bronfort, Ariane; Caps, Hervé

doi:10.1016/j.colsurfa.2015.01.006

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…[23][24][25] Common foams exhibit viscous, elastic and/or plastic responses depending on the external forcing. [26][27][28] For small deformations, foams behave as visco-elastic solids. 29 In this regime, the effective viscosity of a foam is much larger than the viscosity of the foaming solution.…”

Section: Introductionmentioning

confidence: 99%

Damping of liquid sloshing by foams

et al. 2015

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When a container is set in motion, the free surface of the liquid starts to oscillate or slosh. Such effects can be observed when a glass of water is handled carelessly and the fluid sloshes or even spills over the rims of the container. However, beer does not slosh as readily as water, which suggests that foam could be used to damp sloshing. In this work, we study experimentally the effect on sloshing of a liquid foam placed on top of a liquid bath. We generate a monodisperse two-dimensional liquid foam in a rectangular container and track the motion of the foam. The influence of the foam on the sloshing dynamics is experimentally characterized: only a few layers of bubbles are sufficient to significantly damp the oscillations. We rationalize our experimental findings with a model that describes the foam contribution to the damping coefficient through viscous dissipation on the walls of the container. Then we extend our study to confined three-dimensional liquid foam and observe that the behavior of 2D and confined 3D systems are very similar. Thus we conclude that only the bubbles close to the walls have a significant impact on the dissipation of energy. The possibility to damp liquid sloshing using foam is promising in numerous industrial applications such as the transport of liquefied gas in tankers or for propellants in rocket engines.

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Section: Introductionmentioning

confidence: 99%

Damping of liquid sloshing by foams

et al. 2015

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Ultrasonic measurements of the bulk flow field in foams

et al. 2018

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The flow field of moving foams is relevant for basic research and for the optimization of industrial processes such as froth flotation. However, no adequate measurement technique exists for the local velocity distribution inside the foam bulk. We have investigated the ultrasound Doppler velocimetry (UDV), providing the first two-dimensional, non-invasive velocity measurement technique with an adequate spatial (10mm) and temporal resolution (2.5Hz) that is applicable to medium scale foam flows. The measurement object is dry aqueous foam flowing upward in a rectangular channel. An array of ultrasound transducers is mounted within the channel, sending pulses along the main flow axis, and receiving echoes from the foam bulk. This results in a temporally and spatially resolved, planar velocity field up to a measurement depth of 200mm, which is approximately one order of magnitude larger than those of optical techniques. A comparison with optical reference measurements of the surface velocity of the foam allows to validate the UDV results. At 2.5Hz frame rate an uncertainty below 15 percent and an axial spatial resolution better than 10mm is found. Therefore, UDV is a suitable tool for monitoring of industrial processes as well as the scientific investigation of three-dimensional foam flows on medium scales.

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Foams in a rotating drum: An analogy with granular materials

Cited by 2 publications

References 34 publications

Damping of liquid sloshing by foams

Damping of liquid sloshing by foams

Ultrasonic measurements of the bulk flow field in foams

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