Journal ArticleDOI
A Generalized View of Foam Drainage: Experiment and Theory
TLDR
In this paper, a new experimental method is presented using fluorescein dye to determine the spatial and temporal variations of the liquid volume fraction in aqueous foams This method was used for quantitative studies of liquid redistribution (drainage) in three types of experiments: forced, free, and pulsed drainage Characteristic quantities, such as the drainage velocity, show power-law dependences on experimental parameters that are inconsistent with traditional foam drainage models based on Poiseuille-type flow in the liquid-carrying channels (Plateau borders) of the foam.Abstract:
A new experimental method is presented using fluorescein dye to determine the spatial and temporal variations of the liquid volume fraction in aqueous foams This method is used for quantitative studies of liquid redistribution (drainage) in three types of experiments: forced, free, and pulsed drainage Characteristic quantities, such as the drainage velocity, show power-law dependences on experimental parameters that are inconsistent with traditional foam drainage models based on Poiseuille-type flow in the liquid-carrying channels (Plateau borders) of the foam To obtain a theoretical description, the foam drainage equation is generalized using an energy argument which accounts for viscous dissipation in both the channels and the nodes (or vertices, which are the junctions of four channels) of the liquid network Good agreement with results for all three types of drainage experiments is found when using this new model in the limit where the dissipation is dominated by the nodesread more
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Journal ArticleDOI
Short-time tracer dispersion in a two-dimensional rising froth
TL;DR: In this paper, the dispersion of a fluorescein tracer in a rising froth of water/glycerol mixture with SDS as the frother is described, and it is shown that the dominant mechanism for tracer dispersion is due to liquid drainage in the froth rather than due to packed-bed type behaviour as liquid percolates through a network of Plateau borders in between the bubbles.
Journal ArticleDOI
Foaming of crude oil: Effect of acidic components and saturation gas
TL;DR: In this paper, the effect of acidic components and saturation gas on foaming of crude oils with pneumatic and depressurization tests was studied. But the specific surfactant molecules that stabilize crude oil foam are not identified.
Journal ArticleDOI
Drainage of particle-stabilised aluminium composites through single films and Plateau borders
K. Heim,K. Heim,G. S. Vinod Kumar,Francisco García-Moreno,Francisco García-Moreno,Ingo Manke,John Banhart,John Banhart +7 more
TL;DR: In this paper, the complexity of drainage and evolution of Plateau borders in true metal foams can be studied by using a simple model system based on a single metallic film between two artificial plateau borders.
Journal ArticleDOI
Liquid drainage from high-expansion (HiEx) aqueous foams during and after filling of a container
TL;DR: In this paper, the authors obtained solutions of quasi-steady and volume-averaged conservation equations containing the moving foam front to describe the induction period and subsequent drainage, respectively.
Journal ArticleDOI
In situ observation and numerical calculations of the evolution of metallic foams.
Oliver Brunke,Stefan Odenbach +1 more
TL;DR: A direct quantitative comparison between experimental observations performed by means of x-ray radioscopy and numerical solutions of an adapted version of the channel-dominated drainage equation is shown and it can be shown that the material redistribution strongly depends upon the rate at which the pore structure evolves.
References
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Physical chemistry of surfaces
TL;DR: In this paper, the authors discuss the nature and properties of liquid interfaces, including the formation of a new phase, nucleation and crystal growth, and the contact angle of surfaces of solids.
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Stokes flow through periodic arrays of spheres
A. A. Zick,George M. Homsy +1 more
TL;DR: In this paper, the problem of slow flow through a periodic array of spheres was formulated as a set of two-dimensional integral equations for the unknown surface stress vector, thus lowering the dimension of the problem.
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LXIII. On the division of space with minimum partitional area
TL;DR: In this article, the division of space with minimum partitional area is discussed, and the authors propose a solution to the problem of partitioning space with a minimum number of partsitional areas.
Journal ArticleDOI
The foam drainage equation
TL;DR: In this paper, the authors review the history and recent development of this theory, analysing various exact and approximate solutions and relating them to each other, and propose a nonlinear partial differential equation for the foam density as a function of time and vertical position.