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
Citations
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Effects of the rate of evaporation and film thickness on nonuniform drying of film-forming concentrated colloidal suspensions.
TL;DR: The results indicate that the mechanism of water transport to the drying surface in concentrated suspensions is water permeation by osmotic pressure, which is faster than mutual diffusion between water and particles --that has been observed in diluted suspensions and discussed by Routh and Russel.
Journal ArticleDOI
Solutions of surfactant oligomers: a model system for tuning foam stability by the surfactant structure
TL;DR: In this article, the authors report experiments on aqueous foams made of solutions of oligomers of cationic surfactants, where the degree of oligomerization is varied up to 4 and two spacer lengths are used.
Journal ArticleDOI
Computer simulation of the effect of deformation on the morphology and flow properties of porous media.
Sahar Bakhshian,Muhammad Sahimi +1 more
TL;DR: The results of extensive computer simulation of the effect of deformation on the morphology of a porous medium and its fluid flow properties are reported on.
Journal ArticleDOI
Fluorinated and fluorine-free firefighting foams spread on heptane surface
TL;DR: In this article, the effect of foam flow rate and expansion ratio (ER) on foam spreading is studied. And the authors show that an aqueous film on the heptane surface is observed during fluorinated foam spreading but not during fluorine-free foam spreading.
Journal ArticleDOI
Textural equilibrium melt geometries around tetrakaidecahedral grains
TL;DR: In this article, numerical calculations of textural equilibrium geometries are presented for a space-filling tessellation of grains with a tetrakaidecahedral (truncated octahedral) unit cell.
References
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Book
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.