Impact of compound drops: a perspective

Blanken, Nathan; Saleem, Muhammad Saeed; Thoraval, Marie-Jean; Antonini, Carlo

doi:10.1016/j.cocis.2020.09.002

Cited by 88 publications

(36 citation statements)

References 107 publications

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“…The role of impactor differentiation may be investigated numerically, or experimentally using compound drops (e.g. Blanken et al 2021). However, since the compound drop experiments involve immiscible water-oil drops, it will be challenging to study the mixing properties following the impact.…”

Section: Discussionmentioning

confidence: 99%

Rayleigh–Taylor instability in impact cratering experiments

et al. 2022

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When a liquid drop strikes a deep pool of a target liquid, an impact crater opens while the liquid of the drop decelerates and spreads on the surface of the crater. When the density of the drop is larger than the target liquid, we observe mushroom-shaped instabilities growing at the interface between the two liquids. We interpret this instability as a spherical Rayleigh–Taylor instability due to the deceleration of the interface, which exceeds the ambient gravity. We investigate experimentally the effect of the density contrast and the impact Froude number, which measures the importance of the impactor kinetic energy to gravitational energy, on the instability and the resulting mixing layer. Using backlighting and planar laser-induced fluorescence methods, we obtain the position of the air–liquid interface, an estimate of the instability wavelength, and the thickness of the mixing layer. We derive a model for the evolution of the crater radius from an energy conservation. We then show that the observed dynamics of the mixing layer results from a competition between the geometrical expansion of the crater, which tends to thin the layer, and entrainment related to the instability, which increases the layer thickness. The mixing caused by this instability has geophysical implications for the impacts that formed terrestrial planets. Extrapolating our scalings to planets, we estimate the mass of silicates that equilibrates with the metallic core of the impacting bodies.

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Section: Discussionmentioning

confidence: 99%

Rayleigh–Taylor instability in impact cratering experiments

et al. 2022

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“…The bouncing of compound droplets would be also different from pure droplets, while intensive investigations are mainly on the pure droplets bouncing. The compound droplets [12,15,94,[240][241][242][243] may bring more opportunities for the applications due to their richness and various combinations: the wetting overlaying liquid can be beneficial to the deposition of the high-surface-tension core droplet; the environmental overlaying liquid can be a chemical shield for chemical droplet; the sacrificial overlaying liquid can protect the core liquid droplet under extreme conditions.…”

Section: Concluding Remarks and Perspectivesmentioning

confidence: 99%

“…There exist reviews on the droplet impact, [1,12,13] especially impact outcomes or impact mechanisms, and droplet…”

Section: Introductionmentioning

confidence: 99%

“…There exist reviews on the droplet impact, [ 1,12,13 ] especially impact outcomes or impact mechanisms, and droplet bouncing off another liquid. [ 14 ] However, there are rare reviews that systematically summarize regulation methods and applications specially regarding the millimeter‐sized droplet bouncing on non‐wetting solid surfaces and same/miscible liquids, despite its importance for broad and multidisciplinary audiences.…”

Section: Introductionmentioning

confidence: 99%

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Droplet Bouncing: Fundamentals, Regulations, and Applications

Han

Tang

et al. 2022

Small

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Droplet impact is a ubiquitous phenomenon in nature, daily life, and industrial processes. It is thus crucial to tune the impact outcomes for various applications. As a special outcome of droplet impact, the bouncing of droplets keeps the form of the droplets after the impact and minimizes the energy loss during the impact, being beneficial in many applications. A unified understanding of droplet bouncing is in high demand for effective development of new techniques to serve applications. This review shows the fundamentals, regulations, and applications of millimeter‐sized droplet bouncing on solid surfaces and same/miscible liquids (liquid pool and another droplet). Regulation methods and current applications are summarized, and potential directions are proposed.

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“…Nevertheless, the interest in the impact of twophase drops in general has grown in the recent past. A review of compound drop impact is found in [12], although this work mainly deals with two liquid phases. Studies involving a solid component in the drop were, for instance, conducted by [13] who investigated the impact of a sand/water mixture drop.…”

Section: Introductionmentioning

confidence: 99%

Impact of mushy frozen water particles onto a cold surface

Gloerfeld

Schremb

Roisman

et al. 2021

ICLASS

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Icing, as a result from the impact of supercooled water drops, is a hazard for structures exposed to low temperatures, for instance aircraft and wind turbines. Despite very intensive study of the involved phenomena, the underlying physical processes are not yet entirely understood; hence, modelling of the conditions for ice accretion and prediction of the icing rate are presently not reliable. A major difference between solidification of a liquid drop below the melting temperature and a supercooled drop is a very fast dendritic solidification phase associated with the latter. In the present experimental study, the impact behaviour of such mushy, dendritic drops is investigated using a high-speed video system. The impact parameters and the initial liquid drop temperature are varied in the experiments in order to characterize particle deformation and its residual shape. The dynamics of impact of such particles have never been studied before. A theoretical impact model for the particle deformation is applied to this problem. The model is based on the assumption that the material properties of mushy particles can be approximated by rigid-perfectly plastic behaviour. Specifically the yield strength of such particles is estimated as a function of solid ice content, which is estimated for different initial temperatures of particles prior to freezing.

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Impact of compound drops: a perspective

Cited by 88 publications

References 107 publications

Rayleigh–Taylor instability in impact cratering experiments

Rayleigh–Taylor instability in impact cratering experiments

Droplet Bouncing: Fundamentals, Regulations, and Applications

Impact of mushy frozen water particles onto a cold surface

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