From an elongated cavity to funnel by the impact of a drop train

Lee, Jae Hong; Kim, Seung‐Ho; Kim, Joonoh; Kim, Hyoungsoo; Kim, Ho-Young

doi:10.1017/jfm.2021.503

Cited by 4 publications

(3 citation statements)

References 24 publications

(35 reference statements)

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“…The cavity keeps expanding until it reaches a maximum depth. If the maximum depth of the cavity is larger than the capillary bridge diameter D cb , the jet will We adapted the code [34] from for generating this figures. This code evaluates equation 4 at a given time and plots it on top of the experimental images.…”

Section: A Model For the Cavity Expansionmentioning

confidence: 99%

“…Experimental images showing a liquid jet impacting; a) a water capillary bridge, W ejet = 495 and Djet = 93 µm (Movie 1 in the supplementary material), b) a glycerol 78% capillary bridge W ejet = 483 and Djet = 74 µm (Movie 2 in the supplementary material) and c) a PEO 600k 1 wt.% capillary bridge W ejet = 498 and Djet = 80 µm (Movie 3 in the supplementary material). In all the images a comparison with the theoretical profile given by equation 4, shown as a red line.We adapted the code[34] from for generating this figures. This code evaluates equation 4 at a given time and plots it on top of the experimental images.…”

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confidence: 99%

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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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Section: A Model For the Cavity Expansionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Quetzeri-Santiago¹,

Rivas²

2022

Preprint

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“…Concerning drops in parallel with simultaneous or delayed impacts, the impact of two gemini drops onto a deep pool is analyzed in [7][8][9], of two gemini drops onto a thin liquid film in [10], and of three gemini drops onto a thin liquid film in [11,12]. Concerning drops in a series, the impact onto a dry surface is described in [13] and in [14] where heat transfer is also analyzed; the impact onto deep pools is described in [15,16] and in [17], in which the creation of a funnel is also reported.…”

Section: Introductionmentioning

confidence: 99%

Crater Depth after the Impact of Multiple Drops into Deep Pools

Guilizzoni

Frontera²

2022

Fluids

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Many studies have been devoted to single drop impacts onto liquid films and pools, while just a few are available about double drop or drop train impacts, despite the fact that the latter are more realistic situations. Thus, computational fluid dynamics with a volume-of-fluid approach was used here to simulate the impact of multiple drops into deep pools. The aim was to verify if multiple drop impacts significantly differ from single drops ones, and if the models available in the literature for the crater depth in the case of single impacts are reliable also for the multiple drop cases. After validation against experimental data for single and double drop impacts, simulations for four to 30 drops, with a diameter of 2.30 mm, impact velocities 1.0, 1.4, 1.8, and 2.2 m/s, and random initial positions in the domain were performed. The results showed that the time evolution of the crater depth for multiple impacts is similar to the single drop case during the inertial phase, while the following behavior is very different. Consequently, the available models for the maximum crater depth during single drop impacts can still predict the upper and lower bounds of the values of the crater depth during multiple drop impacts within 5% deviation.

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On making holes in liquids

Antkowiak

2021

J. Fluid Mech.

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Just as a solid object would, a liquid jet or a stream of droplets impacting a free surface deforms and perforates it. This generic flow interaction, met in everyday life but also in cutting edge industrial processes, has puzzled scientists for centuries. Lee et al. (J. Fluid Mech., vol. 921, 2021, A8) present an experimental study of a simple droplet train interacting with a liquid bath and identify two stages in the interaction: a first where a cavity elongates and finally bursts, and a second where the interface is steadily punched by the incoming stream. Each of these regimes is explained with elementary but effective models arising from first principles, thereby revealing a full and simple picture of the physics of making holes in liquids.

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From an elongated cavity to funnel by the impact of a drop train

Abstract: Abstract

Cited by 4 publications

References 24 publications

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

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

Crater Depth after the Impact of Multiple Drops into Deep Pools

On making holes in liquids

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