Journal ArticleDOI
Chemical reaction-driven tip-streaming phenomena in a pendant drop
Juan Fernandez,George M. Homsy +1 more
TLDR
A chemical oscillatory phenomenon which occurs as follows: a pendant drop of water is immersed in a viscous oil, both phases containing reagents which react to produce a surfactant at the interface.Abstract:
We describe a chemical oscillatory phenomenon which occurs as follows: a pendant drop of water is immersed in a viscous oil, both phases containing reagents which react to produce a surfactant at the interface. As the drop falls away from the tip of a small needle, the remaining interface spontaneously elongates into a sharp cone and ejects small droplets from the pointed tip. The tip then either contracts and re-elongates periodically, or remains steadily elongated. Small droplets continue to be ejected in either case, and the phenomenon persists over a period of tens of minutes. Quantitative measurements connect these chemically driven phenomena with studies in four-roll mills. A mechanism is proposed by which these phenomena are sustained by Marangoni stresses.read more
Citations
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Journal ArticleDOI
Physics of liquid jets
Jens Eggers,Emmanuel Villermaux +1 more
TL;DR: A review of the fundamental and technological aspects of these subjects can be found in this article, where the focus is mainly on surface tension effects, which result from the cohesive properties of liquids Paradoxically, cohesive forces promote the breakup of jets, widely encountered in nature, technology and basic science.
Journal ArticleDOI
Microscale tipstreaming in a microfluidic flow focusing device
Shelley L. Anna,Hans C. Mayer +1 more
TL;DR: In this paper, the growth of thread and its maximum length as a function of flow variables and surfactant content are characterized. And the period of droplet breakup is also characterized.
Journal ArticleDOI
Capillary threads and viscous droplets in square microchannels
Thomas Cubaud,Thomas G. Mason +1 more
TL;DR: In this article, the formation and evolution of threads containing more viscous liquids surrounded by less viscous, immiscible liquids through hydrodynamic focusing in square microchannels is studied.
Journal ArticleDOI
Role of geometry and fluid properties in droplet and thread formation processes in planar flow focusing
TL;DR: In this paper, scaling arguments are formulated to define dimensionless variables which capture all the parameters that control the droplet breakup process, including the flow rates and the viscosities of the two immiscible fluids, the interfacial tension between the fluids and the numerous dimensions in the flow focusing device.
Journal ArticleDOI
Tip streaming from a liquid drop forming from a tube in a co-flowing outer fluid
Ronald Suryo,Osman A. Basaran +1 more
TL;DR: In this article, the dynamics of formation of a drop of an incompressible Newtonian fluid of viscosity μ1 and density ρ1 from the tip of a tube of radius R1 into a co-flowing immiscible, incompressibly Newtonian liquid of visco-semio-density ρ2 that is enclosed in a concentric cylindrical tube with radius R2 is investigated under creeping flow conditions.
References
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Book
Surfactants and Interfacial Phenomena
TL;DR: In this paper, the Gibbs equation is used to calculate the area per Molecule at the interface by using the Gibbs Equation (GEE) of the Gibbs equilibrium. But the Gibbs equations are not applicable to surface-active agents.
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Formation of dispersions using “flow focusing” in microchannels
TL;DR: In this paper, a flow-focusing geometry is integrated into a microfluidic device and used to study drop formation in liquid-liquid systems, where both monodisperse and polydisperse emulsions can be produced.
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The formation of emulsions in definable fields of flow
TL;DR: The physical and chemical condition of emulsions of two fluids which do not mix has been the subject of many studies, but very little seems to be known about the mechanics of the stirring processes which are used in making them.
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Dispersion phenomena in high viscosity immiscible fluid systems and application of static mixers as dispersion devices in such systems
TL;DR: In this article, the authors discuss the role of statics in high-viscosity IMMISCIBLE FLUID systems and the application of mixers as disphers.