Pneumatic Foam

Stevenson, Paul; Li, Xueliang

doi:10.1002/9781119954620.ch8

Cited by 12 publications

(16 citation statements)

References 55 publications

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“…Among the various applications of liquid foams [1], foam flows in porous media are particularly important in various subsurface applications. They were first used in enhanced oil recovery more than 50 years ago [2] due to their viscosity ratio with oil less unfavorable than that of water, and later, for the same reason, to remediate aquifers contaminated with nonaqueous phase liquids [3].…”

Section: Pacs Numbersmentioning

confidence: 99%

Lamella Division in a Foam Flowing through a Two-Dimensional Porous Medium: A Model Fragmentation Process

et al. 2017

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Section: Pacs Numbersmentioning

confidence: 99%

Lamella Division in a Foam Flowing through a Two-Dimensional Porous Medium: A Model Fragmentation Process

et al. 2017

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“…The thickness of soap films within a foam is indeed one of the key ingredients controlling foam destabilization. Understanding the physical and physicochemical parameters that control film thickness is thus necessary when stable foams are required, as in cosmetics or food products for instance, but also if quick foam collapse is sought for 1 . The coating of thin liquid films onto solid substrates is a widespread industrial process, used for surface functionalization as well as surface protection or lubrication 2 .…”

Section: Introductionmentioning

confidence: 99%

Surfactant-induced rigidity of interfaces: a unified approach to free and dip-coated films

et al. 2015

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The behavior of thin liquid films is known to be strongly affected by the presence of surfactants at the interfaces. The detailed mechanism by which the latter enhance film stability is still a matter of debate, in particular concerning the influence of surface elastic effects on the hydrodynamic boundary condition at the liquid/air interfaces. In the present work, "twin" hydrodynamic models neglecting surfactant transport to the interfaces are proposed to describe the coating of films onto a solid plate (LandauLevich-Derjaguin configuration) as well as soap film pulling (Frankel configuration). Experimental data on the entrained film thickness in both configurations can be fitted very well using a single value of the surface elasticity, which is in good agreement with independent measurements by mean of surface expansion experiments in a Langmuir through. The analysis shows how and when the soap films or dip coating experiments may be used to precisely and sensitively measure the surface elasticity of surfactant solutions.

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“…In addition, foams are already used in various industrial applications and processes such as oil recovery, soil remediation, fire containment or blast wave mitigation. 17,18 A foam, as used in the present study, is an assembly of densely packed bubbles produced upon aeration of a surfactant solution. The flow of foam in two-dimensional channels has been studied extensively both a) Electronic mail: alban.sauret@saint-gobain.com b) A. Sauret and F. Boulogne contributed equally to this work.…”

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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Pneumatic Foam

Cited by 12 publications

References 55 publications

Lamella Division in a Foam Flowing through a Two-Dimensional Porous Medium: A Model Fragmentation Process

Lamella Division in a Foam Flowing through a Two-Dimensional Porous Medium: A Model Fragmentation Process

Surfactant-induced rigidity of interfaces: a unified approach to free and dip-coated films

Damping of liquid sloshing by foams

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