Liquid-Grain Mixing Suppresses Droplet Spreading and Splashing during Impact

Zhao, Song-Chuan; Jong, Rianne de; Meer, Devaraj van der

doi:10.1103/physrevlett.118.054502

Cited by 32 publications

(38 citation statements)

References 44 publications

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“…These two curvatures determine the post-impact dynamics. According to the corresponding crater dimensions (Zhao et al 2015b(Zhao et al , 2017; de Jong, Zhao & van der Meer 2017), the circumference curvature is always larger than the central one. Nevertheless, their relative significance can be altered by the degree of mixing between liquid and grains during the impact.…”

Section: Mixing Ratiomentioning

confidence: 99%

“…In Formation of a hidden cavity 65 fact, this is consistent with a transition of the droplet spreading dynamics. It has been shown that the viscous dissipation of liquid penetrating into the granular target becomes the largest energy sink in this regime (Zhao et al 2017). Hence, regime c may also be interpreted from an energy perspective: no further dynamics would happen after the impact energy is largely dissipated by the viscosity of the liquid moving in the pores between the grains.…”

Section: Mixing Ratiomentioning

confidence: 99%

“…d (Zhao et al 2015b(Zhao et al , 2017) and crater formations (de Jong et al 2017). Another difference between P i and P c is their action period; P i acts during an inertial time scale, τ i = 2(R d + Z * c )/U.…”

mentioning

confidence: 99%

“…As we are interested in the liquid-grain mixing until the maximum droplet spreading is reached, the spreading time is estimated as half of the intrinsic oscillation time of the droplet, τ c = 1 2 (π/6)(ρ l D 3 0 /σ ), where σ is the surface tension of the liquid. These two time scales provide relative weights for P i and P c in the spreading phase of the droplet, and the average effect of the total pressure is evaluated as P = (τ i /τ c )P i + P c (Zhao et al 2017). The two components of P also correspond to two length scales; R d is the length scale of the action of the inertial pressure.…”

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confidence: 99%

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Formation of a hidden cavity below droplets impacting on a granular substrate

Zhao

Jong²,

Meer³

2019

J. Fluid Mech.

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Droplet impact on a granular layer results in various morphologies of the liquid–grain mixture. Some are concentrated and highly curved, some are extended and flatter. No matter how the morphology looks from the top, it is generally believed that its bottom is tightly connected to the concavely deformed granular target. In this paper we report the discovery of a hidden cavity below a droplet residual, formed upon impact on packings of hydrophilic grains and exposed by X-ray tomography. Its occurrence in the parameter space is explored. We elucidate the mechanism leading to this counterintuitive phenomenon using a dual-curvature model and an energy criterion. This research may shed new light onto the ongoing discussion about the origin of the so-called fossilized raindrop impressions.

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Section: Mixing Ratiomentioning

confidence: 99%

Section: Mixing Ratiomentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Formation of a hidden cavity below droplets impacting on a granular substrate

Zhao

Jong²,

Meer³

2019

J. Fluid Mech.

Self Cite

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“…Recent studies focusing on the dynamic contact angle on rough substrates found that the maximum spreading diameter depends on the Weber number and the contact angle at maximum spreading 21 . Roughness affects the spreading of droplets on hydrophilic grains 22 , but has a minor effect on the spreading of water drops impacting hydrophobic grains 22 . Moreover, Bayer and Megaridis in 2006 found that the slip length, i.e.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets

Quetzeri-Santiago

Castrejón‐Pita

2019

Sci Rep

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Whether a droplet splashes upon impact onto a solid is known to depend not only on the fluid properties and its speed, but also on the substrate characteristics. Past research has shown that splashing is heavily influenced by the substrate roughness. Indeed, in this manuscript, we demonstrate that splashing is ruled by the surface roughness, the splashing ratio, and the dynamic contact angle. Experiments consist of water and ethanol droplets impacting onto solid substrates with varying degrees of roughness. High speed imaging is used to extract the dynamic contact angle as a function of the spreading speed for these impacting droplets. During the spreading phase, the dynamic contact angle achieves an asymptotic maximum value, which depends on the substrate roughness and the liquid properties. We 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. In addition, these parameters consistently differentiate the splashing behaviour of impacts onto smooth hydrophilic, hydrophobic and superhydrophobic surfaces.

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Stimuli‐Responsive Bioinspired Materials for Controllable Liquid Manipulation: Principles, Fabrication, and Applications

Wang

Xin

2017

Adv Funct Materials

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Many emerging interfacial technologies, such as self-cleaning surfaces, oil/ water separation, water collection, and microfluidics, are essentially liquid manipulation processes. In this regard, micro-nanostructures of the living organisms are highly preferable, by virtue of the evolutionary pressure and the adaptation to the specific environments, to inspire the optimization of man-made interfaces. With the increasing demands of modern life, research, and industry, intelligent materials with stimuli-responsive liquid manipulation functions have gained substantial attention from interfacial scientists. This review introduces the recent progress in the development of stimuli-responsive liquid-manipulating materials with bioinspired structures and surface chemistry according to two classified manipulation modes: (i) smart manipulation of liquid wetting behaviors, including lyophobic/lyophilic and superlyophobic/superlyophilic, and (ii) smart manipulation of liquid motion behaviors, including coalescence, transportation, rolling/adhesion, and sliding/pinning.At the beginning of the presentation of each classification, the theoretical basis and the sources of inspiration are introduced comprehensively to ensure a better understanding. This review mainly focuses on the mechanisms, fabrication, and applications of the state-of-the-art works related to smart and biomimetic liquid-manipulating materials. Finally, conclusions and future prospects are provided, and the remaining problems and promising breakthroughs in fabricating large-scale, cost-effective, and efficient smart liquid-manipulating materials are outlined.

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Liquid-Grain Mixing Suppresses Droplet Spreading and Splashing during Impact

Cited by 32 publications

References 44 publications

Formation of a hidden cavity below droplets impacting on a granular substrate

Formation of a hidden cavity below droplets impacting on a granular substrate

The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets

Stimuli‐Responsive Bioinspired Materials for Controllable Liquid Manipulation: Principles, Fabrication, and Applications

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