Journal ArticleDOI
The effect of interfacial viscosities on the motion of drops and bubbles
S.K. Agrawal,Darsh T. Wasan +1 more
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In this article, the effect of interfacial viscosities on the creeping motion of a bubble or drop in another fluid medium containing trace amounts of impurities such as surfactants was analyzed.About:
This article is published in Chemical Engineering Journal.The article was published on 1979-12-01. It has received 31 citations till now. The article focuses on the topics: Drop (liquid) & Surface tension.read more
Citations
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Fundamental principles of emulsion rheology and their applications
TL;DR: In this article, a review of the factors that affect the flow characteristics (rheology) of emulsions is presented, including the volume fraction of the dispersal phase, the viscosity of the disperse droplets, the droplet size distribution, the viscous and chemical composition (pH, electrolyte concentration, etc.) of the medium, the interfacial rheology of the emulsifier film and the concentration and nature of the imulsifier.
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Equilibrium and dynamics of adsorption of surfactants at fluid-fluid interfaces
TL;DR: In this paper, a thermodynamic treatment is developed wherein the surface concentration of ionic surfactants is distinguished from their surface excess concentration by the contribution from the electrical double layer.
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Experiments on the rise of air bubbles in clean viscous liquids
TL;DR: In this paper, a number of new experiments have been performed on the rise of air bubbles in clean mixtures of distilled water and pure, reagent grade, glycerine covering a range of the relevant parameter, the Morton number, Mo = gv 4 ρ 3 /σ 3, of 10 13.
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Axial velocity profiles of single bubbles in water/frother solutions
TL;DR: In this article, the axial velocity profile (local velocity versus time or position) of single bubbles in the presence and absence of frother (Dowfroth 250, MIBC and pine oil) was measured in a water column over a distance of 4 m.
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Surfactant dynamics: hidden variables controlling fluid flows
TL;DR: This Perspective describes, in one coherent piece, both the equilibrium properties and dynamic processes of surfactants, to better enable the fluid mechanics community to understand, interpret and design surfactant/fluid systems.
References
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Journal ArticleDOI
Interfacial turbulence: Hydrodynamic instability and the marangoni effect
C.V. Sternling,L. E. Scriven +1 more
TL;DR: In this article, a simplified mathematical model has been analyzed in order to detail the mechanism of the "interfacial engine" which supplies the mechanical energy of interfacial turbulence, which is a manifestation of hydrodynamic instability, touched off by ever present, small, random fluctuations about the interface.
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Dynamics of a fluid interface Equation of motion for Newtonian surface fluids
TL;DR: In this article, the authors derived a completely general formulation of the dynamics of a Newtonian fluid interface, that is, one whose rheological behaviour is characterized by its equilibrium interfacial tension and B oussinesq's [18] two coefficients of surface viscosity.
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Expansions at small Reynolds numbers for the flow past a sphere and a circular cylinder
Ian Proudman,J. R. A. Pearson +1 more
TL;DR: In this paper, the Navier-Stokes equation is replaced by a set of differential equations for the coefficients ψn and Ψn, but only one set of physical boundary conditions is applicable to each expansion (the no-slip conditions for the Stokes expansion, and the uniform-stream condition for the Oseen expansion).
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The effect of surfactants on the terminal velocity of drops and bubbles
TL;DR: In this paper, the terminal velocity at small Reynolds numbers has been related to the cap size and then to the type and amount of surfactant used, which agreed well with the theory except in two instances.
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The effect of interfacial stabilizing films on the elastic and viscous properties of emulsions
TL;DR: In this paper, the elastic and viscous properties of a dilute emulsion of one incompressible viscous liquid in another, when subjected to small variable rates of strain, is extended to include the possibility of an interfacial film being present everywhere between the two components.