Impact of water drops onto the junction of a hydrophobic texture and a hydrophilic smooth surface

Vaikuntanathan, Visakh; Kannan, R.; Sivakumar, D.

doi:10.1016/j.colsurfa.2010.07.034

Cited by 58 publications

(47 citation statements)

References 39 publications

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“…Experimental and simulation results 6,9,25 showed that the impact process will have richer phenomena when the surface is hydrophobic, which can be achieved in the simulation through a small ε between the liquid and solid surfaces. 26 Thus, to have richer phenomena, the values of the parameters are set to be ε water−Pt = 1.09 × 10 −20 J; ε Pt−Pt = 1.11 × 10 −19 J; σ water−Pt = 2.82 × 10 −10 m; σ Pt−Pt = 2.47 × 10 −10 m; and r cut = 10 Å.…”

Section: Simulation Methodsmentioning

confidence: 97%

“…3 Although the impact of macrodroplets has been extensively investigated through theoretical analysis, 4 experiments, [5][6][7][8][9] and numerical simulations, [10][11][12][13] whether the concepts derived from these studies are applicable to micro-/nanodroplet impact remains unclear. Molecular dynamics simulation has been performed in previous studies on micro-/nanodroplet impact, such as in fragmentation phenomenon [14][15][16] and the effect of the substrate nature on fragmentation.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of viscous dissipation in nanodroplet impact and spreading

Zhang

Chen

2015

Physics of Fluids

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The developments in nanocoating and nanospray technology have resulted in the increasing importance of the impact of micro-/nanoscale liquid droplets on solid surface. In this paper, the impact of a nanodroplet on a flat solid surface is examined using molecular dynamics simulations. The impact velocity ranges from 58 m/s to 1044 m/s, in accordance with the Weber number ranging from 0.62 to 200.02 and the Reynolds number ranging from 0.89 to 16.14. The obtained maximum spreading factors are compared with previous models in the literature. The predicted results from the previous models largely deviate from our simulation results, with mean relative errors up to 58.12%. The estimated viscous dissipation is refined to present a modified theoretical model, which reduces the mean relative error to 15.12% in predicting the maximum spreading factor for cases of nanodroplet impact. C 2015 AIP Publishing LLC. [http://dx.

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Section: Simulation Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Estimation of viscous dissipation in nanodroplet impact and spreading

Zhang

Chen

2015

Physics of Fluids

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“…The experiments on the impact of millimetric liquid drops on the dual-textured surface were carried out using the experimental apparatus described in Ref. [14]. Two different liquids, distilled water (to be referred to as W from here onwards), and an ethanol-water mixture with the ratio 5%:95% by mass (to be referred to as E05 from here onwards), were considered in this work.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Directional motion of impacting drops on dual-textured surfaces

Vaikuntanathan

Sivakumar

2012

Phys. Rev. E

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In this work, we analyze the directional movement of impacting liquid drops on dual-textured solid surfaces comprising two different surface morphologies: a textured surface and a smooth surface. The dynamics of liquid drops impacting onto the junction line between the two parts of the dual-textured surfaces is studied experimentally for varying drop impact velocity. The dual-textured surfaces used here featured a variation in their textures' geometrical parameters as well as their surface chemistry. Two types of liquid drop differing in their surface tension were used. The impact process develops a net horizontal drop velocity towards the higher-wettability surface portion and results in a bulk movement of the impacting drop liquid. The final distance moved by the impacting drop from the junction line decreases with increasing impacting drop Weber number We. A fully theoretical model, employing a balance of forces acting at the drop contact line as well as energy conservation, is formulated to determine the variation, with We, of net horizontal drop velocity and subsequent movement of the impacting drop on the dual-textured surfaces.

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“…Inclination, compliance, and finite size of the leaves all amplify this asymmetry [19]. Drop impacts that yield asymmetric behaviors were also studied with (i) horizontal gradients of texture and wetting properties [45][46][47][48][49][50], (ii) varying inclination or tangential speed of the substrate [51][52][53], and (iii) nonaxisymmetric target shapes [54,55]. The relationship between liquid sheet asymmetry and droplet ejections was investigated for a stationary liquid sheet [56].…”

Section: Introductionmentioning

confidence: 99%

Edge effect: Liquid sheet and droplets formed by drop impact close to an edge

2018

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Asymmetric liquid sheet fragmentation is ubiquitous in nature and potentially shapes critical phenomena such as rain-induced propagation of foliar diseases. In this experimental study, we investigate the formation and fragmentation of a liquid sheet upon impact of a drop close to the edge of a solid substrate. Both the impact Weber number and the offset, the distance from the impact point to the edge, are systematically varied. Their influence on the kinematics of the liquid sheet and the subsequent statistics of droplet ejection are rationalized. Three major asymmetry scenarios are identified and linked to distinct droplet ejection patterns. Scaling laws are proposed to rationalize these scenarios based on impact parameters.

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Impact of water drops onto the junction of a hydrophobic texture and a hydrophilic smooth surface

Cited by 58 publications

References 39 publications

Estimation of viscous dissipation in nanodroplet impact and spreading

Estimation of viscous dissipation in nanodroplet impact and spreading

Directional motion of impacting drops on dual-textured surfaces

Edge effect: Liquid sheet and droplets formed by drop impact close to an edge

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