The engulfment of aqueous droplets on perfectly wetting oil layers

Cuttle, Callum; Thompson, A. R.; Pihler-Puzović, Draga; Juel, Anne

doi:10.1017/jfm.2021.90

Cited by 7 publications

(12 citation statements)

References 51 publications

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“…44 Even on silicone oil, which has a slightly lower density than water, small droplets will initially float at the oil–air interface and then slowly sink into the bulk. The timescale of sinking is at least one order of magnitude longer than the timescale of the convective flow, 45 allowing us to consider these microdroplets to be floating as well. For both types of oil, these floating microdroplets cause only a minor disturbance to the interface, as shown Fig.…”

Section: Resultsmentioning

confidence: 99%

Marangoni-induced reversal of meniscus-climbing microdroplets

Sun

Weisensee

2023

Soft Matter

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Section: Resultsmentioning

confidence: 99%

Marangoni-induced reversal of meniscus-climbing microdroplets

Sun

Weisensee

2023

Soft Matter

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“…2019; Cuttle et al. 2021), which also aids in the formation of the hook-shaped rim (Peschka et al. 2018).…”

Section: Taylor–culick Retractions: Numericsmentioning

confidence: 99%

“…Furthermore, the surrounding bath (s) engulfs the retracting film in order to feed the precursor film. This is a result of the high capillary pressure (high curvature) in the wedge region near the apparent three-phase contact line (Sanjay et al 2019;Cuttle et al 2021), which also aids in the formation of the hook-shaped rim (Peschka et al 2018). Moreover, for the cases where there is a density contrast between the film and the surroundings, the top-bottom symmetry can break down even for the two-phase configuration due to a flapping instability at very low Oh s , as discussed by Lhuissier & Villermaux (2009) and Jian et al (2020b).…”

Section: Taylor-culick Retractions: Numericsmentioning

confidence: 99%

Taylor–Culick retractions and the influence of the surroundings

et al. 2022

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When a freely suspended liquid film ruptures, it retracts spontaneously under the action of surface tension. If the film is surrounded by air, the retraction velocity is known to approach the constant Taylor–Culick velocity. However, when surrounded by an external viscous medium, the dissipation within that medium dictates the magnitude of the retraction velocity. In the present work, we study the retraction of a liquid (water) film in a viscous oil ambient (two-phase Taylor–Culick retractions), and that sandwiched between air and a viscous oil (three-phase Taylor–Culick retractions). In the latter case, the experimentally measured retraction velocity is observed to have a weaker dependence on the viscosity of the oil phase as compared with the configuration where the water film is surrounded completely by oil. Numerical simulations indicate that this weaker dependence arises from the localization of viscous dissipation near the three-phase contact line. The speed of retraction only depends on the viscosity of the surrounding medium and not on that of the film. From the experiments and the numerical simulations, we reveal unprecedented regimes for the scaling of the Weber number ${We}_{f}$ of the film (based on its retraction velocity) or the capillary number ${Ca}_{s}$ of the surroundings versus the Ohnesorge number ${Oh}_{s}$ of the surroundings in the regime of large viscosity of the surroundings ( ${Oh}_{s} \gg 1$ ), namely ${We}_{f} \sim {Oh}_{s}^{-2}$ and ${Ca}_{s} \sim {Oh}_{s}^{0}$ for the two-phase Taylor–Culick configuration, and ${We}_{f} \sim {Oh}_{s}^{-1}$ and ${Ca}_{s} \sim {Oh}_{s}^{1/2}$ for the three-phase Taylor–Culick configuration.

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“…Cuttle et al. (2021) decomposed the interfacial dynamics generated when an aqueous drop contacts an oil layer into different stages: first, the short-time spreading of the oil film on the aqueous drop, forming a radially expanding liquid bridge; then the complete engulfment of the drop by the oil film, followed by the drop being ‘pushed’ into the bath or film. For larger Bond numbers (ratio between gravity and surface tension forces), gravity can also affect the drop dynamics and its equilibrium shape.…”

Section: Introductionmentioning

confidence: 99%

“…For thick films, , Cuttle et al. (2021) described the long-time entrapment and transport into the bath. Despite these recent considerations, however, drop engulfment dynamics for moderate have been considered sparsely and are the focus of this work.…”

Section: Introductionmentioning

confidence: 99%

Engulfment of a drop on solids coated by thin and thick fluid films

et al. 2023

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When an aqueous drop contacts an immiscible oil film, it displays complex interfacial dynamics. When the spreading factor is positive, upon contact, the oil spreads onto the drop's liquid–air interface, first forming a liquid bridge whose curvature drives an apparent drop spreading motion and later engulfs the drop. We study this flow using both three-phase lattice Boltzmann simulations based on the conservative phase field model, and experiments. Inertially and viscously limited dynamics are explored using the Ohnesorge number $Oh$ and the ratio between the film height $H$ and the initial drop radius $R$ . Both regimes show that the radial growth of the liquid bridge $r$ is fairly insensitive to the film height $H$ , and scales with time $T$ as $r\sim T^{1/2}$ for $Oh\ll 1$ , and as $r\sim T^{2/5}$ for $Oh\gg 1$ . For $Oh\gg 1$ , we show experimentally that this immiscible liquid bridge growth is analogous with the miscible drop–film coalescence case. Contrary to the growth of the liquid bridge, however, we find that the late-time engulfment dynamics and final interface profiles are significantly affected by the ratio $H/R$ .

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The engulfment of aqueous droplets on perfectly wetting oil layers

Abstract: Abstract

Cited by 7 publications

References 51 publications

Marangoni-induced reversal of meniscus-climbing microdroplets

Marangoni-induced reversal of meniscus-climbing microdroplets

Taylor–Culick retractions and the influence of the surroundings

Engulfment of a drop on solids coated by thin and thick fluid films

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