Dipping into a new pool: The interface dynamics of drops impacting onto a different liquid

Fudge, Ben D.; Cimpeanu, Radu; Castrejón‐Pita, Alfonso A.

doi:10.1103/physreve.104.065102

Cited by 16 publications

(26 citation statements)

References 30 publications

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“…By considering viscous dissipation (µU 2 0 /D 2 0 ), and balancing the initial kinetic energy of the jet with the displaced liquid on the pool and energy of the jet at a time t after impact. Then, U c can be expressed as 59 ,…”

Section: We Wementioning

confidence: 99%

Cavity dynamics after the injection of a microfluidic jet onto capillary bridges

Quetzeri-Santiago

Rivas

2023

Soft Matter

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Section: We Wementioning

confidence: 99%

Cavity dynamics after the injection of a microfluidic jet onto capillary bridges

Quetzeri-Santiago

Rivas

2023

Soft Matter

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“…However, the order of the length and time scales associated with such azimuthal instabilities as well as the underlying physics will not be far off from the predictions of the present study. The literature on the computational drop dynamics studies (binary and/or ternary phase) suggests that it is indeed important as well as practical to implement an axisymmetric formulation instead of setting up full-scale three-dimensional simulations. ,, This type of axisymmetric implementation ensures that the underlying physics of the phenomena that the study is trying to explore can be addressed and explained in a coherent manner than going into the minute details of the phenomena. Also, in many of the asymptotic limits, the results from the axisymmetric implementation are found to be identical with the full 3-D implementation, solidifying the practicality of implementing such a technique over the computationally expensive 3-D simulations.…”

Section: Resultsmentioning

confidence: 99%

“…33,34 On the other hand, a couple of experimental studies have demonstrated the impact dynamics of a spherical liquid drop onto a bath of immiscible liquid for relatively smaller impact velocities. [35][36][37]42 However, there are no reports as such where the study illustrates the post-impact flow morphologies of an immiscible droplet impacting another immiscible liquid pool at a very high velocity in the literature.…”

Section: ■ Introductionmentioning

confidence: 93%

“…In such systems, the effects of interfacial tensions alongside the density and viscosity contrasts of the fluids across the interfaces play crucial roles in determining the post-impact spatiotemporal dynamics. In this direction, a few recent numerical and experimental studies delve into improving the understanding of the ternary phase drop impacts. − For example, a number of mathematical approaches have been developed to tackle the flow details of the triplet of interfaces using the energy minimization-based finite element (FEM) and lattice-Boltzmann (LBM) methods. ,,,,, Furthermore, the post-impact flow morphologies of a ternary phase droplet impact have also been explored using a diffused interface model when the impact velocity is relatively low. , On the other hand, a couple of experimental studies have demonstrated the impact dynamics of a spherical liquid drop onto a bath of immiscible liquid for relatively smaller impact velocities. − , However, there are no reports as such where the study illustrates the post-impact flow morphologies of an immiscible droplet impacting another immiscible liquid pool at a very high velocity in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Kelvin–Helmholtz Instability Augmented by von Kármán Vortex Shedding during an Oil Droplet Impact on a Water Pool

2023

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The impact of an oil droplet on a water surface has been explored with the aid of computational fluid dynamics simulations. The study reveals the details of the spatiotemporal evolution of such a ternary system with a triplet of interfaces, e.g., air−water, oil−water, and oil−air, when the impact velocity of the oil droplet with the water surface is high. The oil droplet is found to flatten, spread, stretch, and eventually dewet on the water surface of the deep crater to show a host of interesting post-impact flow morphologies. Furthermore, at higher impact velocities, the formation of a biphasic oil−water crown is observed followed by the ejection of secondary water droplets from the crown tip due to capillary instability. The rapidly spreading oil film on the "crater" of the water surface is found to undergo Kelvin−Helmholtz instability before dewetting the same due to cohesion failure. Subsequently, the formation of an array of secondary oil droplets is observed during the process of dewetting. The dominant wavelength evaluated from the linear stability analysis of a representative flow system could faithfully predict the simulated spacing of dewetted oil droplets floating on the crater. Importantly, the variations in Laplace pressure around the curvatures of the undulatory interfaces along with sharp viscosity gradients across the three-phase contact line is found to engender interesting recirculation patterns, which eventually shed to form a coherent wake region in air near the crater. We also uncover the conditions under which the counter-rotating vortices shed along the oil−water interface resembling a von Kaŕmań vortex street.

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Section: A Model For the Cavity Expansionmentioning

confidence: 99%

Cavity dynamics after the injection of a microfluidic jet in capillary bridges

Quetzeri-Santiago¹,

Rivas²

2022

Preprint

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The impact of solid and liquid objects (projectiles) onto liquids and soft solids (targets) generally results on the creation and expansion of an air cavity inside the impacted objects. The dynamics of cavity expansion and collapse depends on the projectile inertia as well as on the target properties.In this paper we study the impact of microfluidic jets generated by thermocavitation processes on a capillary bridge between two parallel planar walls. Different capillary bridge types were studied, Newtonian liquids, viscoelastic liquids and agarose gels. Thus, we compare the cavity formation and collapse between a wide range of material properties. Moreover, we model the critical impact velocity for a jet to traverse a capillary bridge type. Our results show that agarose gels with a storage modulus lower that 176 Pa can be modelled as a liquid for this transition. However, the predicted transition deviates for agarose gels with higher storage modulus. Additionally, we show different types of cavity collapse, depending on the Weber number and the capillary bridge properties. We conclude that the type of collapse determines the number and size of entrained bubbles. Furthermore, we study the effects of wettability on the adhesion forces and contact line dissipation. We conclude that upon cavity collapse, for hydrophobic walls a Worthington jet is energetically favourable. In contrast, for hydrophilic walls, the contact line dissipation is in the same order of magnitude of the energy of the impacted jet, suppressing the Worthington jet formation. Our results provide strategies for preventing bubble entrapment and give an estimation of the cavity dynamics for needle-free injection applications and additive manufacturing among other applications.

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Dipping into a new pool: The interface dynamics of drops impacting onto a different liquid

Cited by 16 publications

References 30 publications

Cavity dynamics after the injection of a microfluidic jet onto capillary bridges

Cavity dynamics after the injection of a microfluidic jet onto capillary bridges

Kelvin–Helmholtz Instability Augmented by von Kármán Vortex Shedding during an Oil Droplet Impact on a Water Pool

Cavity dynamics after the injection of a microfluidic jet in capillary bridges

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