Journal ArticleDOI
Partial universality: pinch-off dynamics in fluids with smectic liquid crystalline order
TLDR
In this paper, the authors report on measurements of pinch-off dynamics for a lyotropic surfactant/water solution in the lamellar phase and a thermotropic liquid crystal in the smectic phase.Abstract:
Droplet pinch-off of fluids with liquid crystalline order is a common yet poorly understood process. We report on measurements of pinch-off dynamics for a lyotropic surfactant/water solution in the lamellar phase and a thermotropic liquid crystal in the smectic phase. We find pinch-off is universal and well described by a similarity solution for a strain thinning power-law fluid. This finding is consistent with bulk rheology measurements which show these materials shear thin with the appropriate power-law dependence. Remarkably, we find depending on material processing, this universal pinch-off cuts off at different length scales. Collectively, these phenomena lead to an exceptional form of singularity where pinch-off is both universal and dependent on initial conditions.read more
Citations
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Pinch-off dynamics and dripping-onto-substrate (DoS) rheometry of complex fluids
TL;DR: It is shown that dripping-onto-substrate rheometry protocols that involve visualization and analysis of capillary-driven thinning and pinch-off dynamics of a columnar neck formed between a nozzle and a sessile drop can be used for measuring shear viscosity, power law index, extensional viscosities, relaxation time and the most relevant processing timescale for printing.
Journal ArticleDOI
Droplet formation and scaling in dense suspensions
TL;DR: It is argued that this scaling is a consequence of particles deforming the neck surface, thereby creating a pressure that is balanced by inertia, and how it emerges from topological constraints that relate particle configurations with macroscopic Gaussian curvature.
Journal ArticleDOI
Dynamic interfacial tension effects in the rupture of liquid necks
M. Robert de Saint Vincent,Julien Petit,Mounir Aytouna,Jean-Pierre Delville,Daniel Bonn,Hamid Kellay +5 more
TL;DR: In this paper, the authors examine the rupture of fluid necks during droplet formation of surfactant-laden liquids and observe deviations from expected behaviour for the pinch-off of such necks.
Journal ArticleDOI
Breakup dynamics of slender bubbles in non-newtonian fluids in microfluidic flow-focusing devices
TL;DR: In this article, a scaling law was proposed to describe the size of bubbles generated in non-Newtonian fluids at microscale and the results revealed that the rheological properties of the continuous phase affect significantly the bubble breakup in such microdevices.
Journal Article
Droplet Formation and Scaling in Dense Suspensions
TL;DR: In this article, the authors used high-speed imaging to find the neck minimum radius of a dense suspension drop and found that detachment of a suspension drop is described by a power law.
References
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Book
The Structure and Rheology of Complex Fluids
TL;DR: In this article, the authors present a comprehensive overview of the properties and properties of complex fluids and their properties in terms of physics, chemistry, physics theory, and physics of complex fluid properties.
Book
Surfactants and Polymers in Aqueous Solution
TL;DR: In this paper, the authors introduce the concept of Surfactants and discuss their role as emulsifiers for oil and soil removal, as well as their relationship with surface active polymers and polymers containing Oxyethylene groups.
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
Universal pinching of 3D axisymmetric free-surface flow
TL;DR: This work considers the viscous motion of an axisymmetric column of fluid with a free surface and the Navier-Stokes equation forms a singularity as the height of the fluid neck goes to zero.
Journal ArticleDOI
On the breakup of viscous liquid threads
TL;DR: In this paper, a one-dimensional model evolution equation is used to describe the nonlinear dynamics that can lead to the breakup of a cylindrical thread of Newtonian fluid when capillary forces drive the motion.