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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Biotemplated hierarchical surfaces and the role of dual length scales on the repellency of impacting droplets
Matthew McCarthy,Konstantinos Gerasopoulos,Ryan Enright,James N. Culver,Reza Ghodssi,Evelyn N. Wang +5 more
TL;DR: In this article, the role of each length scale during droplet impact was investigated by decomposing the micro and nanoscale components of hierarchical superhydrophobic surfaces using the Tobacco mosaic virus and found that 10 µl water droplets rebounded at impact velocities greater than 4.3 µm/s.
Journal ArticleDOI
The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets.
TL;DR: It is found that this maximum dynamic contact angle, together with the liquid properties, the ratio of the peak to peak roughness and the surface feature mean width, determines the splashing to no-splashing threshold.
Journal ArticleDOI
Droplet impact dynamics on textiles
Gannian Zhang,Miguel A. Quetzeri-Santiago,Corinne A. Stone,Lorenzo Botto,J. Rafael Castrejón-Pita +4 more
TL;DR: It is shown by balancing the dynamic impact and capillary pressures that the penetration behaviour is governed by a threshold pore size, the liquid characteristics and the droplet diameter, and the ability of a textile to repel water is controlled by the mesh size.
Journal ArticleDOI
Drop impact printing.
Chandantaru Dey Modak,Arvind Kumar,Arvind Kumar,Abinash Tripathy,Abinash Tripathy,Prosenjit Sen +5 more
TL;DR: In this article, the authors proposed a simple drop-on-demand printing technique which replaces the use of a nozzle with a sieve, enabling printing of nanoparticle suspension with 71% mass-loading, performed for surface tension range of 72-32mNm-1 and viscosity up to 33mPas.
Journal ArticleDOI
Droplet fragmentation using a mesh
TL;DR: In this paper, the atomization of droplets impacting a mesh, starting with the elementary unit of a single hole, is investigated, and it is shown how this process can be used to generate finely controlled sprays with micrometric droplet sizes and low kinetic energy, as is critical for agricultural applications.
References
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Journal ArticleDOI
Water impacting on superhydrophobic macrotextures.
Anaïs Gauthier,Sean Symon,Sean Symon,Christophe Clanet,Christophe Clanet,David Quéré,David Quéré +6 more
TL;DR: It is shown that the contact time of drops bouncing on a repellent macrotexture takes discrete values when varying the impact speed, which allows for a quantitative analysis of the reduction of contact time and thus to understand how and why Macrotextures can control the dynamical properties of bouncing drops.
PatentDOI
Fluid-based gating mechanism with tunable multiphase selectivity and antifouling behavior
TL;DR: In this article, a gating mechanism that uses a capillary stabilized liquid as a reversible, reconfigurable gate that fills and seals pores in the closed state, and creates a non-fouling, liquid-lined pore in the open state is disclosed.
Journal ArticleDOI
Size effect on the coalescence-induced self-propelled droplet
TL;DR: In this article, an analysis based on the energy conservation is presented for the self-propelled droplet during coalescence of two droplets of the same size over a superhydrophobic rough surface.
Journal ArticleDOI
Engineering a nanostructured "super surface" with superhydrophobic and superkilling properties.
TL;DR: Nanostructured super surfaces fabricated using a simple recipe based on deep reactive ion etching of a silicon wafer could find applications for designing self-cleaning and anti-bacterial surfaces in diverse applications such as microfluidics, surgical instruments, pipelines and food packaging.
Journal ArticleDOI
The force of impacting rain
Dan Soto,Dan Soto,Aurélie Borel De Larivière,Aurélie Borel De Larivière,Xavier Boutillon,Christophe Clanet,Christophe Clanet,David Quéré,David Quéré +8 more
TL;DR: This work imagines two kinds of devices allowing us to deduce the size of the raindrop from impact forces, considering natural parameters such as drop radius and density, impact speed and response time of the substrate.