Effect of Approach Velocity on Thin Liquid Film Drainage between an Air Bubble and a Flat Solid Surface

Zhang, Xurui; Manica, Rogério; Tchoukov, Plamen; Liu, Qingxia; Xu, Zhenghe

doi:10.1021/acs.jpcc.6b11502

Cited by 48 publications

(56 citation statements)

References 52 publications

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“…It is possible to investigate PS complexes or any emulsion system by examining the drop pair interactions using direct force measurement methods such as AFM, larger scale methods such as the Integrated Thin Film Drainage Apparatus (IFTDA) (9,74) or the cantilevered capillary apparatus (10,75). However, these studies require extensive sub-discipline expertise and are unable to perform measurements at a timescale comparable to other emulsion characterisation methods.…”

Section: Introductionmentioning

confidence: 99%

Forces between oil drops in polymer-surfactant systems: Linking direct force measurements to microfluidic observations

Jamieson

Fewkes

Berry

et al. 2019

Journal of Colloid and Interface Science

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Both microfluidics and atomic force microscopy have been used to quantify the forces between oil drops in the presence of complexes formed with anionic surfactant, sodium dodecyl sulphate, and neutral, water soluble polymer, poly(vinylpyrrolidone). Measurement and modelling of the interaction forces between both rigid and deformable surfaces demonstrated that the attraction between the drops is due to depletion forces, whereas the repulsive force is a combination of electrical double layer and steric forces, indicating complexes exist both in the bulk and at the drop interface. We developed a new microfluidic device to first form and then break-up chains of drops, where the drop break-up is sensitive to the underlying surface forces between the drops, not hydrodynamic drainage forces. The interaction behaviour between the force measurements and the microfluidic observations showed a strong correlation, where the observed adhesion between drops in the microfluidics is sensitive to the drop deformation and Laplace pressure. Correlation between the two techniques provides insight into the surface forces between drops in flowing systems. This work opens the possibility of developing high-throughput measurements of adhesive interactions between drops and has the potential utility in the formulation of emulsions.

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Section: Introductionmentioning

confidence: 99%

Forces between oil drops in polymer-surfactant systems: Linking direct force measurements to microfluidic observations

Jamieson

Fewkes

Berry

et al. 2019

Journal of Colloid and Interface Science

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“…Intensive research on bubble rise, bubble‐solid contact, and attachment under different water chemistry conditions and solid hydrophobicity has been carried out for the last two decades by researchers in Poland, providing in‐depth information about the particle‐bubble attachment process. A dynamic force apparatus (DFA) was recently developed at the University of Alberta to investigate the hydrodynamic effect of a bubble approaching a hydrophobic surface and their attachment . The research has confirmed the following: a) the probability of particle‐bubble attachment increases if the particle‐bubble approaching velocity is equivalent to the drainage velocity of the intervening liquid film; b) increasing the surface hydrophobicity increases the mobility of water in the thin liquid film, promoting faster drainage of the liquid; c) the smaller the contact area, the faster the liquid drainage and the higher the probability of attachment; and d) smaller bubbles (30‐100 μm) are more effective for attachment onto a flotation‐size bubble, as the coalescence time decreases considerably when the microbubbles are smaller than 100 μm.…”

Section: Generation Of Micro‐nanobubblesmentioning

confidence: 92%

Role of mineral flotation technology in improving bitumen extraction from mined Athabasca oil sands—II. Flotation hydrodynamics of water‐based oil sand extraction

Zhou¹,

HaiHong²,

Chow³

et al. 2019

Can J Chem Eng

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Bitumen flotation hydrodynamics in water‐based oil sand extraction is critically reviewed by comparing aeration of oil sand slurries with mineral flotation. The role of the two‐stage particle‐bubble attachment model in flotation is emphasized as a means to accelerate bitumen flotation recovery. It involves the generation of micro/nanobubbles and their frosting on hydrophobic bitumen droplets, followed by their attachment to a flotation‐size bubble via its coalescence with the nanobubbles frosted on the bitumen. Nanobubble generation by hydrodynamic cavitation demonstrates that the size of nanobubbles can be reduced, and the number of nanobubbles increased by fast liquid flow, intensified agitation, high dissolved gas content and surfactant concentration. The mechanism of pre‐existing gas nuclei in enhancing nanobubble generation by cavitation is utilized to produce a large volume of stabilized nanobubbles for practical flotation, by continuously recirculating the stream through a gas saturation tank or a cavitation tube. The aeration of oil sand slurries in hydrotransport pipelines is analyzed based on its similarity to dissolved air flotation. Bitumen extraction recovery increased significantly with the presence of nanobubbles in the system. The role of improved flotation hydrodynamics in bitumen recovery is briefly discussed in terms of the Suncor operation using flotation columns to process oil sand middling streams. Future research should be directed at understanding bitumen flotation kinetics, optimizing size ranges of nanobubbles for maximized flotation recovery, minimizing wearing of cavitation tubes in industrial operations, and intensifying the role of in‐situ nanobubble nucleation on hydrophobic particles/bitumen droplets in flotation, especially for bitumen extraction from underperforming oil sands.

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“…In our system, the disjoining pressure is defined as the sum of electrical double-layer interaction Q edl and van der Waals interaction Q vdw , in Eq. (3) (Li and Somasundaran 1993;Zhang et al 2017).…”

Section: Analysis Of Suspension Apparent Viscositymentioning

confidence: 99%

Effect of ultrafine kaolinite particles on the flotation behavior of coking coal

Xia

Peng

et al. 2020

Int J Coal Sci Technol

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Kaolinite, as a mineral in fine coal, has an important influence on the flotation of coal particles. In this study, the effects of ultrafine kaolinite particles on the flotation recovery of coal particles were investigated. Flotation tests were carried out using a mixture of coal particles and different amounts of ultrafine kaolinite particles. Combined with the Stefan-Reynold theory, the effect of liquid film drainage rate between coal bubbles in a kaolinite suspension was calculated. The yield of flotation clean coal increases quickly with the increasing content of ultrafine kaolinite particles. The ultrafine kaolinite particles can reduce the surface tension of the suspension, weaken the bubble coalescence, and stabilize the structure of the froth layer. In addition, the ultrafine kaolinite particles increase the apparent viscosity of the flotation pulp slightly. It is concluded that the role of ultrafine kaolinite particles on the positive effect of froth properties conceals the negative effect on the liquid film drainage rate between coal particles and bubbles caused by the kaolinite particles, which ultimately leads to an increasing yield of clean coal with an increasing content of kaolinite particles. This study is important for understanding the influence of ultrafine kaolinite on coal particle flotation.

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Effect of Approach Velocity on Thin Liquid Film Drainage between an Air Bubble and a Flat Solid Surface

Cited by 48 publications

References 52 publications

Forces between oil drops in polymer-surfactant systems: Linking direct force measurements to microfluidic observations

Forces between oil drops in polymer-surfactant systems: Linking direct force measurements to microfluidic observations

Role of mineral flotation technology in improving bitumen extraction from mined Athabasca oil sands—II. Flotation hydrodynamics of water‐based oil sand extraction

Effect of ultrafine kaolinite particles on the flotation behavior of coking coal

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