Oblique drop impact onto a deep liquid pool

Gielen, Marise V.; Sleutel, Pascal; Benschop, Jos; Riepen, M.; Voronina, Victoria; Visser, Claas Willem; Lohse, Detlef; Snoeijer, Jacco H.; Versluis, Michel; Gelderblom, Hanneke

doi:10.1103/physrevfluids.2.083602

Cited by 42 publications

(21 citation statements)

References 46 publications

(86 reference statements)

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“…For the regimes of bowl-shaped droplets and capsules, the air cavity plays a significant role in defining the final shape of the droplets. This is closely related to the well-studied phenomena of cavity formation and bubble entrainment (Bergmann et al 2006(Bergmann et al , 2009Peters, van der Meer & Gordillo 2013;Gielen et al 2017). For the impact of a droplet on a bath of the same fluid, it is known that increasing the impact velocity leads to the formation of a cavity in the bath and wave swells at the free surface.…”

Section: Forces and Non-dimensional Numbersmentioning

confidence: 84%

Viscoplastic water entry

2019

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The impact of viscoplastic droplets on a free surface of water is studied. The droplet undergoes an elasto-plastic deformation at the early stages of water entry. At large time, the yield stress dominates; therefore, the droplet solidifies and reaches an equilibrium shape. Depending on the impact velocity and the rheology of the droplet, the final morphologies vary from pear-shaped to capsules that contain bubbles. We perform an analysis of the orders of magnitude of the forces and introduce the relevant dimensionless groups. Furthermore, we categorize the final shapes in a phase diagram and analyse their geometrical properties. The process presents a method of making non-spherical beads and capsules with tunable shapes and provides information on the general problem of the impact of highly deformable objects on a liquid surface.

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Section: Forces and Non-dimensional Numbersmentioning

confidence: 84%

Viscoplastic water entry

2019

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“…viscoplasticity (Jalaal, Kemper & Lohse 2019), impact angles (Okawa et al 2006;Gielen et al 2017) and thickness of the target layer (Berberović et al 2009) on impact dynamics have been examined. Based on these experiments, several models of the crater size evolution and its related acceleration history were developed, using energy conservation (e.g.…”

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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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“…The change in air viscosity significantly affects the whole dynamics of drop impact 53 and thus it would be crucial to investigate the effect of air viscosity on air entrapment during drop impact on a liquid pool. Further studies should be expanded to understand the oblique impact of droplets on deep liquid pools [54][55][56] , the impact of viscoelastic or viscous droplets [57][58][59] , and the impact-induced fabrication 60,61 , with more facilitating of numerical 62 , theoretical 63 , and experimental approaches 64,65 .…”

Section: Discussionmentioning

confidence: 99%

Air evolution during drop impact on liquid pool

Lee

Weon

Park

et al. 2020

Sci Rep

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We elucidate the evolution of the entrained air in drop impact on a wide range of liquids, using ultrafast X-ray phase-contrast imaging. We elaborate the retraction mechanism of the entrapped air film in terms of liquid viscosity. We found the criterion for deciding if the entrapped air evolves into single or double bubbles, as determined by competition among inertia, capillarity, and viscosity. Low viscosity and low surface tension induce a small daughter droplet encapsulated by a larger air shell bubble, forming an antibubble. We demonstrate a phase diagram for air evolution regarding hydrodynamics.

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Oblique drop impact onto a deep liquid pool

Cited by 42 publications

References 46 publications

Viscoplastic water entry

Viscoplastic water entry

Rayleigh–Taylor instability in impact cratering experiments

Air evolution during drop impact on liquid pool

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