Journal ArticleDOI
Singular jets and bubbles in drop impact.
TLDR
It is shown that when water droplets gently impact on a hydrophobic surface, the droplet shoots out a violent jet, the velocity of which can be up to 40 times the drop impact speed.Abstract:
We show that when water droplets gently impact on a hydrophobic surface, the droplet shoots out a violent jet, the velocity of which can be up to 40 times the drop impact speed. As a function of the impact velocity, two different hydrodynamic singularities are found that correspond to the collapse of the air cavity formed by the deformation of the drop at impact. It is the collapse that subsequently leads to the jet formation. We show that the divergence of the jet velocity can be understood using simple scaling arguments. In addition, we find that very large air bubbles can remain trapped in the drops. The surprising occurrence of the bubbles for low-speed impact is connected with the nature of the singularities, and can have important consequences for drop deposition, e.g., in ink-jet printing.read more
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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.
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Drop Impact on a Solid Surface
TL;DR: In this article, the authors focus on recent experimental and theoretical studies, which aim at unraveling the underlying physics, characterized by the delicate interplay of liquid inertia, viscosity, and surface tension, but also the surrounding gas.
Journal ArticleDOI
High-Speed Imaging of Drops and Bubbles
TL;DR: In this article, the authors present recent technological advances in charge-coupled-device ultra-high-speed video cameras and their applications in experimental fluid mechanics, emphasizing the dynamics of drops and bubbles.
Journal ArticleDOI
Drop dynamics after impact on a solid wall: Theory and simulations
TL;DR: In this paper, the impact of a fluid drop onto a planar solid surface at high speed was studied and it was shown that at impact, kinetic energy dominates over surface energy and inertia dominates over viscous effects.
Journal ArticleDOI
Drop impact upon micro- and nanostructured superhydrophobic surfaces
TL;DR: In this article, the authors investigate drop impact dynamics on different superhydrophobic surfaces, consisting of regular polymeric micropatterns and rough carbon nanofibers, with similar static contact angles.