The effect of fine particles on the drainage and coarsening of foam

Britan, A. B.; Liverts, M.; Ben‐Dor, G.; Koehler, SA; Bennani, Nora

doi:10.1016/j.colsurfa.2009.03.011

Cited by 55 publications

(37 citation statements)

References 37 publications

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“…dispersions of densely packed gas bubbles in a liquid [5]. Some very recent studies have focussed on the drainage behaviour of foamy complex fluids, such as clays [6], coal fly ashes [7], colloidal suspensions [8], granular suspensions [9], emulsions [10]. Despite the results provided by these studies, a sound understanding of drainage laws in the presence of suspended particulate matter is still lacking.…”

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confidence: 99%

Flow and jamming of granular suspensions in foams

2014

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Abstract:The drainage of particulate foams is studied under conditions where the particles are not trapped individually by constrictions of the interstitial pore space. The drainage velocity decreases continuously as the particle volume fraction increases. The suspensions jam -and therefore drainage stops -for values which reveal a strong effect of the particle size.In accounting for the particular geometry of the foam, we show that accounts for unusual confinement effects when the particles pack into the foam network. We model quantitatively the overall behavior of the suspension -from flow to jamming -by taking into account explicitly the divergence of its effective viscosity at . Beyond the scope of drainage, the reported jamming transition is expected to have a deep significance for all aspects related to particulate foams, from aging to mechanical properties.

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confidence: 99%

Flow and jamming of granular suspensions in foams

2014

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“…For example, on the basis of the scaling behavior (power law) between the drainage velocity and the imposed flow rate in forced drainage experiments [180], the presence of nanoparticles has been found to induce a foam drainage transition from a node-dominated regime to a Plateau borderdominated regime. Moreover, unusual phenomena, such as large foam permeability exponents and prefactors, which have not been observed in aqueous foams, have been recorded in three-phase foams [178]. It should be noted that these phenomena in three-phase foams cannot be explained simply based on the theories developed for aqueous foams.…”

Section: Foam Drainage For Aqueous Foamsmentioning

confidence: 99%

“…An alternative way to study foam drainage on the macroscopic level is to adopt dimensional analysis to compare the existing foam drainage data in a consistent manner and thus simplify the analysis [19]. [168,[171][172][173][178][179][180][181][182][183][184][185]. Nevertheless, these studies contribute to our understanding of drainage behaviors in the presence of solid particles.…”

Section: Foam Drainage For Aqueous Foamsmentioning

confidence: 99%

“…To explain the foam drainage behaviors in the presence of hydrophilic particles, several mechanisms have been proposed, such as rheology of the powder suspension and clogging in the confined regions of the Plateau borders [172,178,181,[183][184][185]. Among them, the most important parameter controlling the drainage behaviors of foams with hydrophilic particles is the confinement parameter, , which relates the size of the particle to the maximum diameter of the circle inscribed in the Plateau border cross-section.…”

Section: Foam Drainage For Three-phase Foams or Frothmentioning

confidence: 99%

“…For example, the foam regime transition in aqueous foams is usually caused by a change in the surface viscosity or interface mobility [186,187]. However, it is difficult to make the same claim in foams containing nanoparticles because the presence of hydrophilic solid particles can change the interfacial properties to only a small extent [180].To explain the foam drainage behaviors in the presence of hydrophilic particles, several mechanisms have been proposed, such as rheology of the powder suspension and clogging in the confined regions of the Plateau borders [172,178,181,[183][184][185]. Among them, the most important parameter controlling the drainage behaviors of foams with hydrophilic particles is the confinement parameter, , which relates the size of the particle to the maximum diameter of the circle inscribed in the Plateau border cross-section.…”

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Effects of reagents and solid particles on drainage and stability of liquid film, foam and froth

Wang¹

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The objective of this study is to explore the interrelated mechanisms governing foam drainage and stability by modeling the foam column kinetics, measuring the interfacial properties of the air-water interface and conducting forced drainage experiments. Studies on foams are usually divided into four length scales: (i) a gasliquid interface (molecular scale), (ii) a liquid film (nanometer scale), (iii) a bubble (millimeter scale), and (iv) a foam (meter scale). Although much progress has been made in each length scale, the correlation between the different length scales remains poorly understood and quantified. The present study seeks to address this problem. In many industrial processes, such as froth flotation and foam fractionation, careful control of the foam or froth stability is required to optimize the process performance. Therefore, an understanding of the correlation between the different length scales is of paramount interest for industrial applications. The present study can be divided into three different parts: (1) foam column kinetics, (2) mechanisms governing foamability and foam stability, and (3) foam drainage in the presence of solid particles.The first part models foam column kinetics to predict the evolution of foam growth, liquid fraction, the transport of liquid and gas in growing foams and foam collapse by analogy with chemical kinetics. First, a modeling framework was formulated to categorize the foam or froth growth models into zeroth, first and second order, according to the dependence of the foam collapse rate on the foam volume or height.Then, a novel kinetic model was developed based on the mass balance of gas and liquid in the foam column to simulate the foam column kinetics. Finally, the simulation results were compared with the reported experimental data. Good agreement between model predictions and published experimental results confirms the validity of the analogy between foam column kinetics and reaction kinetics.Mechanisms governing the foamability and foam stability are crucial to understanding foam behaviors. The foamability and foam stability of surfactant blend and surfactant solutions in different electrolyte concentrations were examined to elucidate the different mechanisms that collectively determine foamability and foam stability. The foam growth kinetic model developed in the previous section was also applied here. First, the foamability of sodium dodecyl sulfate (SDS)-dodecanol (DOH) IIsolutions was investigated to test the conventional theories that apply to a single surfactant of pre-critical micelle concentration (CMC). The remarkable decrease in the foamability of SDS solutions caused by the addition of DOH could not be easily explained by the theories of surface tension and surface viscoelasticity. Instead, alternative mechanisms were proposed. Second, findings regarding the foamability of SDS-DOH solutions were extended to froth flotation, that is, the effect of a nonpolar collector (diesel oil) on the foamability of frother solutions (methyl isobutyl ca...

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Fire‐Fighting Foam Technology

Martin

2012

Foam Engineering

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The effect of fine particles on the drainage and coarsening of foam

Cited by 55 publications

References 37 publications

Flow and jamming of granular suspensions in foams

Flow and jamming of granular suspensions in foams

Effects of reagents and solid particles on drainage and stability of liquid film, foam and froth

Fire‐Fighting Foam Technology

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