Experimental evidence of flow destabilization in a two-dimensional bidisperse foam

Cantat, Isabelle; Poloni, Celine; Delannay, Renaud

doi:10.1103/physreve.73.011505

Cited by 12 publications

(7 citation statements)

References 16 publications

(24 reference statements)

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“…The compressibility is the flow is probably not involved either, since it has been checked in other experiments and simulations that incompressible flows of foam around an obstacle present a negative wake (C. Raufaste and S. J. Cox, private communication). It would be interesting to check whether fore-aft asymmetry is also observed in other studies of foam flows, either in three-dimensional (de Bruyn 2004;Cantat & Pitois 2005) or in two-dimensional flows around a large bubble (Cantat et al 2004;Cantat, Poloni & Delannay 2006), but these studies do not report detailed features of the velocity field.…”

Section: Discussion Of the Reference Experiments 421 Velocitymentioning

confidence: 95%

Two-dimensional flow of foam around a circular obstacle: local measurements of elasticity, plasticity and flow

Dollet

Graner²

2007

J. Fluid Mech.

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We investigate the two-dimensional flow of a liquid foam around circular obstacles by measuring all the local fields necessary to describe this flow: velocity, pressure, bubble deformations and rearrangements. We show how our experimental setup, a quasi-2D "liquid pool" system, is adapted to the determination of these fields: the velocity and bubble deformations are easy to measure from 2D movies, and the pressure can be measured by exploiting a specific feature of this system, a 2D effective compressibility. To describe accurately bubble rearrangements, we propose a new, tensorial descriptor. All these quantities are evaluated via an averaging procedure that we justify showing that the fluctuations of the fields are essentially random. The flow is extensively studied in a reference experimental case; the velocity presents an overshoot in the wake of the obstacle, the pressure is maximum at the leading side and minimal at the trailing side. The study of the elastic deformations and of the velocity gradients shows that the transition between plug flow and yielded regions is smooth. Our tensorial description of T1s highlight their correlation both with the bubble deformations and the velocity gradients. A salient feature of the flow, notably on the velocity and T1 repartition, is a marked asymmetry upstream/downstream, signature of the elastic behaviour of the foam. We show that the results do not change qualitatively when various control parameters (flow rate, bubble area, fluid fraction, bulk viscosity, obstacle size and boundary conditions) vary, identifying a robust quasistatic regime. These results are discussed in the frame of the actual foam rheology literature, and we argue that they constitute a severe test for existing rheological models, since they capture both the elastic, plastic and fluid behaviour of the foam.

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Section: Discussion Of the Reference Experiments 421 Velocitymentioning

confidence: 95%

Two-dimensional flow of foam around a circular obstacle: local measurements of elasticity, plasticity and flow

Dollet

Graner²

2007

J. Fluid Mech.

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“…The principle of large bubbles moving faster than smaller ones under common driving leads to segregation if a foam is composed of significantly differently sized species. In a foam with continuous bubble-size distribution, reconciling the relative motion of all bubbles is a formidable task, and a full self-consistent description of polydisperse foam flows is still outstanding (Cantat et al 2006).…”

Section: Bubble Intrudersmentioning

confidence: 99%

Gas-Liquid Foam Dynamics: From Structural Elements to Continuum Descriptions

Stewart

Hilgenfeldt

2023

Annu. Rev. Fluid Mech.

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Gas-liquid foams are important in applications ranging from oil recovery and mineral flotation to food science and microfluidics. Beyond their practical use, they represent an intriguing prototype of a soft material with a complex, viscoelastic rheological response. Crucially, foams allow detailed access to fluid-dynamical processes on the mesoscale of bubbles underlying the large-scale material behavior. This review emphasizes the importance of the geometry and interaction of mesoscale structural elements for the description of the dynamics of entire foams. Using examples including bulk flow of foam under steady shear, interfacial instabilities, and foam fracture through bubble rupture, this article highlights the wide variety of available theoretical descriptions, ranging from network modeling approaches coupling structural element equations of motion to full continuum models with elastoviscoplastic constitutive relations. Foams offer the opportunity to develop rigorous links between such disparate descriptions, providing a blueprint for physical modeling of dynamical multiscale systems with complex structure. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…The method used to drive the foam mimics an experimental method [35] to create flowing foams, and is numerically implemented in a similar manner to Langlois [6]. By this method, bubbles within a fixed length, H, in the initial part of the channel are driven by a force F p .…”

Section: Computational Detailsmentioning

confidence: 99%

Attraction-induced jamming in the flow of foam through a channel

2016

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We study the flow of a pressure-driven foam through a straight channel using numerical simulations, and examine the effects of a tuneable attractive potential between bubbles. This potential, which accounts for the effects of disjoining pressure in the liquid films between separating bubbles, is shown here to introduce jamming and stick-slip flow in a straight channel. We report on the behaviour of these new regimes by varying the strength of the attractive potential. It is seen that there is a force threshold below which the flow jams, and on increasing the driving force, a cross over from intermittent (stick-slip) to smooth flow is observed. This threshold force below which the foam jams increases linearly with the strength of the attractive potential. By examining the spectra of energy fluctuations, we show that stick-slip flow is characterized by low frequency rearrangements and strongly local behaviour, whereas steady flow shows a broad spectrum of energy drop events and collective behaviour. Our work suggests that the stick-slip and the jamming regimes occur due to the increased stabilization of contact networks by the attractive potential -as the strength of attraction is increased, bubbles are increasingly trapped within networks, and there is a decrease in the number of contact changes.

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Experimental evidence of flow destabilization in a two-dimensional bidisperse foam

Cited by 12 publications

References 16 publications

Two-dimensional flow of foam around a circular obstacle: local measurements of elasticity, plasticity and flow

Two-dimensional flow of foam around a circular obstacle: local measurements of elasticity, plasticity and flow

Gas-Liquid Foam Dynamics: From Structural Elements to Continuum Descriptions

Attraction-induced jamming in the flow of foam through a channel

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