Two-dimensional constriction flows of foams

Jones, Siân; Dollet, Benjamin; Slosse, N.; Jiang, Yi; Cox, Simon; Graner, François

doi:10.1016/j.colsurfa.2010.11.054

Cited by 21 publications

(25 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For foams, we now have access to sequences of images, containing thousands of bubbles, undergoing coarsening (bubble volumes evolve due to gas diffusion between them) [6,7,8,9], drainage (liquid motion through the network of Plateau borders), and rheology (bulk motion of the foam itself) [10]. The significant drawback in all these imaging techniques is that they do not resolve the films between bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…Many data-sets have been collected for liquid foams using X-ray tomography; they include static and coarsening foams [8,9], and flowing foams moving through a constriction [10] and around a fixed sphere [14]. We choose to examine an experiment in which a small sphere falls through a foam under its own weight: not just because of its relevance to froth flotation [15], but because changes in sphere velocity are related to changes in foam structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reconstruction of tomographic images of dry aqueous foams

Davies

Cox

Lambert

2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

Self Cite

View full text Add to dashboard Cite

X-ray tomography offers the possibility to examine the local changes in the structure of a three-dimensional aqueous foam as it flows, allowing a better fundamental understanding of foam rheology and the validation of models. We present an automated algorithm that reconstructs a dry aqueous foam from such images. Our algorithm uses ImageJ to extract from an image the topology of the network of Plateau borders in the foam, and then analyses this network to re-create the films and then the bubbles, and equilibrates the structure in Surface Evolver. We validate our algorithm and demonstrate its precision by applying it to simulated foam structures and analysing the topology and geometry obtained. We then apply our algorithm to a sequence of images from an experiment in which a spherical bead falls under its own weight through a polydisperse dry foam. This allows us to describe the evolution of the foam's liquid content and the bubble volumes with time as well as the distribution of bubble pressure and the forces exerted on a falling sphere.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconstruction of tomographic images of dry aqueous foams

Davies

Cox

Lambert

2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the wet limit we get The values of σ L sP b calculated by Equation (19) vs the experimentally measured ones are presented in Figure 9. The values of G are calculated from photos using Equation (10).…”

Section: Electrical Conductivitymentioning

confidence: 99%

“…Instabilities induced by a localized injection of air in quasi-2D foams were studied experimentally and theoretically by Dollet et al [17,18]. Bubble monolayers are also often used to investigate a foam flow in a confined geometry [19,20]. Another very interesting possible application of quasi-2D foams is to study more complicated systems such as foamed emulsions (a mixture of bubbles and oil droplets in the water) or foams containing nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity of quasi-two-dimensional foams

et al. 2015

View full text Add to dashboard Cite

Quasi-2D foams consist of monolayers of bubbles squeezed between two narrowly spaced plates. These simplified foams have served successfully in the past to shed light on numerous issues in foam physics. Here we consider the electrical conductivity of such model foams. We compare experiments to a model which we propose, and which successfully relates the structural and the conductive properties of the foam over the full range of the investigated liquid content. We show in particular that in the case of quasi-2D foams the liquid in the nodes needs to be taken into account even at low liquid content. We think that these results may provide new approaches for the characterisation of foam properties and for the in-situ characterisation of the liquid content of foams in confining geometries, such as microfluidics.

show abstract

“…Since foam is certainly non-Newtonian, there have been a number of experiments on contraction flows of foams (see the review in [11]), and more recently quasi-static simulations have been performed [12], and compared with experiments in order to validate them in the limit of low flow-rates.…”

Section: Flow Through a Constrictionmentioning

confidence: 99%

Visualizing the dynamics of two-dimensional foams with FoamVis

Cox¹,

Lipsa²,

Davies³

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

Self Cite

View full text Add to dashboard Cite

We describe an interactive computer program FoamVis that provides techniques for visualization, exploration and analysis of time-dependent 2D foam simulation data generated by the Surface Evolver. The program takes a sequence of Surface Evolver files and animates them to show velocity vectors, local strain, the position of topological changes, and the forces on objects immersed in a foam flow, and enables the user to simultaneously compare different simulations. We use FoamVis to show the correlation between different attributes, such as bubble velocity and T1 density, in a foam flowing through a constriction, the relationship between orientation and foam-induced forces acting on an elliptical object falling through a foam under gravity, and the changes in bubble size that occur during diffusion-driven coarsening of a foam containing a mixture of gases.

show abstract

Two-dimensional constriction flows of foams

Cited by 21 publications

References 16 publications

Reconstruction of tomographic images of dry aqueous foams

Reconstruction of tomographic images of dry aqueous foams

Electrical conductivity of quasi-two-dimensional foams

Visualizing the dynamics of two-dimensional foams with FoamVis

Contact Info

Product

Resources

About