Foam free drainage and bubbles size for surfactant concentrations below the CMC
20 Dec 2015-Colloids and Surfaces A: Physicochemical and Engineering Aspects (Elsevier)-Vol. 487, pp 92-103
TL;DR: In this article, the authors examined how low surfactant concentration affects foam destabilization and elucidate the interplay between free drainage and bubble size variation, showing that moderately stable foams depend largely on surfactants below the critical micelle concentration (SDS).
About: This article is published in Colloids and Surfaces A: Physicochemical and Engineering Aspects.The article was published on 2015-12-20. It has received 44 citations till now. The article focuses on the topics: Bubble & Coalescence (physics).
Citations
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TL;DR: In this paper, the authors examined foam stability through solid-fluids interactions between solid particles of hydrocarbon reservoirs and aqueous foam and found that foam in the presence of solid particles is a function of density, shape, size, and wettability of particles where monolayer, bilayer of network or particles stabilise foam lamella or rupture foam structure.
53 citations
TL;DR: The results of both experiments and simulations indicate that foam additives play an essential role in foam stability and the synergic effects of surfactants and nanoparticles exhibit more favorable performance.
49 citations
TL;DR: In this paper, the microscopic characteristics of foams stabilized by viscoelastic surfactant (EAPB) and nanoparticles (SiO2) at different temperature were investigated.
39 citations
TL;DR: In this paper, the authors present the first experimental study of surface wettability-independent critical heat flux (CHF) during boiling crisis with foaming solutions and observe a power law exponent of half between the CHF and the bubble size.
32 citations
TL;DR: In this article, the authors evaluated the effect of Hexa decyl trimethylammonium bromide (CTAB) nanoemulsion on the performance of conventional waterflooding process.
30 citations
References
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TL;DR: This review covers recent advances in the study of foam drainage and coarsening, focusing especially on the effective role of the foam chemical components on those aging processes, and summarizes how the surfactant, the liquid bulk properties, and the gas modify or not the drainage andCoarsening features.
Abstract: This review covers recent advances in the study of foam drainage and coarsening, focusing especially on the effective role of the foam chemical components on those aging processes. The determination of the relevant parameters controlling foam drainage and coarsening today remains a major issue: are the physical parameters (like bubble size and liquid fraction) sufficient to define a foam and to predict its evolution, or do the chemical components also matter? And if these foam components are important, one has to determine by which mechanisms, and which microscopic parameters involved in these mechanisms are eventually crucial. I report here recent experimental results, shedding light on these issues. It allows us to summarize how the surfactant, the liquid bulk properties, and the gas modify or not the drainage and coarsening features. The coupling between drainage and coarsening is also discussed, as well as the role of the experimental conditions (sample height, shape or foam uniformity).
319 citations
17 Feb 2012
TL;DR: Foam fractionation is an exciting and emerging technology, starting to gain significant attention as mentioned in this paper, which is a vital topic for many industries, especially mineral processing, petroleum engineering, bioengineering, consumer products, and food sector.
Abstract: Containing contributions from leading academic and industrial researchers, this book provides a much needed update of foam science research.
The first section of the book presents an accessible summary of the theory and fundamentals of foams. This includes chapters on morphology, drainage, Ostwald ripening, coalescence, rheology, and pneumatic foams.
The second section demonstrates how this theory is used in a wide range of industrial applications, including foam fractionation, froth flotation and foam mitigation. It includes chapters on suprafroths, flotation of oil sands, foams in enhancing petroleum recovery, Gas-liquid Mass Transfer in foam, foams in glass manufacturing, fire-fighting foam technology and consumer product foams.
Key features:
Foam fractionation is an exciting and emerging technology, starting to gain significant attention
Discusses a vital topic for many industries, especially mineral processing, petroleum engineering, bioengineering, consumer products and food sector
Links foam science theory to industrial applications, making it accessible to an engineering science audience
Summarizes the latest developments in this rapidly progressing area of research
Contains contributions from leading international researchers from academia and industry
243 citations
TL;DR: Free-drainage experiments with slow- and fast-coarsening gases show markedly different dynamics and elucidate the importance of the coupling of the two effects.
Abstract: The evolution of a foam is determined by drainage flow of the continuous (liquid) phase and coarsening (aging) of the dispersed phase (gas bubbles). Free-drainage experiments with slow- and fast-coarsening gases show markedly different dynamics and elucidate the importance of the coupling of the two effects. Strong coarsening leads to drainage times that are shorter (accelerated drainage) and independent of the initial liquid content (self-limiting drainage). A model incorporating the physics of both drainage and diffusive coarsening shows quantitative agreement with experiment.
241 citations
TL;DR: In this article, the decay of pneumatic foam is studied in detail and the fundamental equations, the assumptions involved and the results obtained are discussed in detail, and presented within a unified framework.
221 citations
TL;DR: In this article, the effects of surfactant type and bubble surface mobility on foam rheological properties are discussed, focusing on the viscous friction between bubbles in steadily sheared foams, as well as between bubbles and confining solid wall.
Abstract: This paper is an overview of our recent understanding of the effects of surfactant type and bubble surface mobility on foam rheological properties. The focus is on the viscous friction between bubbles in steadily sheared foams, as well as between bubbles and confining solid wall. Large set of experimental results is reviewed to demonstrate that two qualitatively different classes of surfactants can be clearly distinguished. The first class is represented by the typical synthetic surfactants (such as sodium dodecylsulfate) which are characterised with low surface modulus and fast relaxation of the surface tension after a rapid change of surface area. In contrast, the second class of surfactants exhibits high surface modulus and relatively slow relaxation of the surface tension. Typical examples for this class are the sodium and potassium salts of fatty acids (alkylcarboxylic acids), such as lauric and myristic acids. With respect to foam rheology, the second class of surfactants leads to significantly higher viscous stress and to different scaling laws of the shear stress vs. shear rate in flowing foams. The reasons for these differences are discussed from the viewpoint of the mechanisms of viscous dissipation of energy in sheared foams and the respective theoretical models. The process of bubble breakup in sheared foams (determining the final bubble-size distribution after foam shearing) is also discussed, because the experimental results and their analysis show that this phenomenon is controlled by foam rheological properties.
193 citations