Journal ArticleDOI
Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes
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TLDR
This study has studied the effect of different geometrical parameters of superhydrophobic copper meshes on different modes of droplet rebound, and observes that for flexible meshes, the transition to pancake type bouncing is induced at lower Weber numbers.Abstract:
When a droplet impacts a superhydrophobic sieve, a part of the droplet penetrates through it when the dynamic pressure (ρU2) of the impinging droplet exceeds the breakthrough pressure (γΓ/A). At higher impact velocities, the ejected-jet breaks and separates from the main droplet. The remaining part of the droplet bounces off the surface showing different modes (normal bouncing as a vertically elongated drop or pancake bouncing). In this work, we have studied the effect of different geometrical parameters of superhydrophobic copper meshes on different modes of droplet rebound. We observe three different effects in our study. Firstly, we observe pancake like bouncing, which is attributed to the capillary energy of the rebounding interface formed after the breaking of the ejected-jet. Secondly, we observe leakage of the droplet volume and kinetic energy due to the breaking of the ejected-jet, which leads to reduction in the contact times. Finally, we observe that for flexible meshes, the transition to pancake type bouncing is induced at lower Weber numbers. Flexibility also leads to a reduction in the volume loss from the ejected-jet. This study will be helpful in the design of superhydrophobic meshes for use under impact scenarios.read more
Citations
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Effects of Surface Wettability on the Dewetting Performance of Hydrophobic Surfaces.
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Water penetration dynamics through a Janus mesh during drop impact
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Penetration and aerosolization of cough droplet spray through face masks: A unique pathway of transmission of infection
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Dynamics of drop impact on heated metal wires: Thermally induced transition from tail to splash to jumping modes
TL;DR: In this article, experimental and theoretical analyses of the drop impact on heated metal wires within a wide temperature range and demonstrate the transition modes depending on the contact surface temperatures as functions of the physicochemical properties (ethanol, water, and acetone), the impact velocity, and the dimensions of the liquid drops.
Journal ArticleDOI
Drop impacting on a single layer of particles: Evolution of ring without particles
TL;DR: In this article, the impacts of a millimeter sized water drop hitting a layer of uniformly distributed particles on a hydrophilic/hydrophobic glass slide were examined and a ring/disc structure without particles was formed and modified by two mechanisms: pushout and pullback.
References
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Purity of the sacred lotus, or escape from contamination in biological surfaces
TL;DR: It is shown here for the first time that the interdependence between surface roughness, reduced particle adhesion and water repellency is the keystone in the self-cleaning mechanism of many biological surfaces.
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Designing Superoleophobic Surfaces
Anish Tuteja,Wonjae Choi,Minglin Ma,Joseph M. Mabry,Sarah A. Mazzella,Gregory C. Rutledge,Gareth H. McKinley,Robert E. Cohen +7 more
TL;DR: It is shown how a third factor, re-entrant surface curvature, in conjunction with chemical composition and roughened texture, can be used to design surfaces that display extreme resistance to wetting from a number of liquids with low surface tension, including alkanes such as decane and octane.
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TL;DR: Key advances in the understanding and fabrication of surfaces with controlled wetting properties are about to make the dream of a contamination-free (or 'no-clean') surface come true.
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Drop Impact Dynamics: Splashing, Spreading, Receding, Bouncing ...
TL;DR: In this article, a review deals with drop impacts on thin liquid layers and dry surfaces, referred to as splashing, and their propagation is discussed in detail, as well as some additional kindred, albeit nonsplashing, phenomena like drop spreading and deposition, receding (recoil), jetting, fingering, and rebound.