Impact of a compound drop on a dry surface

Chen, R. H.; Kuo, Min Liang; Chiu, Sheng Lin; Pu, Jen-Yung; Lin, Ta Hui

doi:10.1007/bf03177445

Cited by 14 publications

(6 citation statements)

References 7 publications

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“…Only a few studies have looked at the impact of compound drops on a solid surface (15)(16)(17)(18)(19)(20) or a liquid pool (21)(22)(23)(24)(25). Partial rebound of the impacting liquids after impact on a solid surface was observed by Chen et al (15) and Liu and Tran (18), but they did not explain the underlying mechanism. Complete rebound of the core and shell liquids was observed on a hot surface (26,27) due to the Leidenfrost effect (28)(29)(30)(31)(32).…”

Section: Introductionmentioning

confidence: 99%

Rebound of self-lubricating compound drops

et al. 2020

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Drop impact on solid surfaces is encountered in numerous natural and technological processes. Although the impact of single-phase drops has been widely explored, the impact of compound drops has received little attention. Here, we demonstrate a self-lubrication mechanism for water-in-oil compound drops impacting on a solid surface. Unexpectedly, the core water drop rebounds from the surface below a threshold impact velocity, irrespective of the substrate wettability. This is interpreted as the result of lubrication from the oil shell that prevents contact between the water core and the solid surface. We combine side and bottom view high-speed imaging to demonstrate the correlation between the water core rebound and the oil layer stability. A theoretical model is developed to explain the observed effect of compound drop geometry. This work sets the ground for precise complex drop deposition, with a strong impact on two- and three-dimensional printing technologies and liquid separation.

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Section: Introductionmentioning

confidence: 99%

Rebound of self-lubricating compound drops

et al. 2020

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“…Importantly, by jetting ouzo from the liquid column, we can produce such oil-lubricated drop in short time without waiting for the drop evaporation. This system might also be used for studying the impact dynamics of emulsion or compound droplets on the substrate − as well as future applied studies.…”

Section: Resultsmentioning

confidence: 99%

Ouzo Column under Impact: Formation of Emulsion Jet and Oil-Lubricated Droplet

et al. 2021

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We investigated the dynamics of a liquid column consisting of ouzo emulsion under the impact generated when the liquid container lands on a hard ground. At a cavitation number of 0.36, where cavitation is expected to occur, our high-speed videography captured the traveling jet and cavitation bubbles while the oil microdroplets in ouzo after different runs of impact were visualized by an optical microscope. Importantly, the impact on an ouzo column can eject a focused jet of the emulsion and deposit a small volume of emulsion on a solid substrate. As revealed by our still photography, the deposited emulsion formed an oil-lubricated drop immediately. Our findings have implications for jetting applications such as inkjet printing of emulsions or fast deposition of self-lubricating drops for assembling supraparticles. We also discuss the jet formation mechanism in terms of the existence of oil microdroplets.

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“…One of the earliest studies on the impact of compound droplets observed their splashing and rebound behaviors upon impact on a flat, dry surface, which are also characteristic phenomena in single-phase droplet research. Nonetheless, the flow of the two phases within the compound droplet also gives rise to different impact dynamics, such as the ejection of the two phases during the spreading of water-in-oil compound droplets. , Additionally, a theoretical investigation of the maximal spreading feature of the impact was conducted using a three-phase numerical model .…”

Section: Introductionmentioning

confidence: 95%

“…Given their practical applications in the food industry, pharmaceutics, additive manufacturing, and energy utilization, compound droplets have garnered significant interest in recent years. 6,8,9 One of the earliest studies on the impact of compound droplets 10 observed their splashing and rebound behaviors upon impact on a flat, dry surface, which are also characteristic phenomena in single-phase droplet research. Nonetheless, the flow of the two phases within the compound droplet also gives rise to different impact dynamics, such as the ejection of the two phases during the spreading of water-in-oil compound droplets.…”

Section: ■ Introductionmentioning

confidence: 99%

Compound Droplet Impact on a Thin Hydrophobic Cylinder

Yin,

Huang,

et al. 2023

Langmuir

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The impact of compound droplets on solid surfaces is a ubiquitous phenomenon that pervades both the natural and technological fields. A comprehensive understanding of the dynamics of the droplet impact on solid surfaces is therefore of paramount importance for a broad range of applications. In this study, we investigate the impact of a water-in-oil compound droplet on a thin hydrophobic cylindrical surface, with regard to the Weber number and cylinder dimensions. Owing to the prewetting effect of the oil, the droplet completely engulfs the cylinder during impact. The ensuing breakups of oil and water engender various unique impact outcomes, which are depicted via a phase map. The phase boundaries are described by analyzing the gravitational and drag forces exerted by the cylinder. A threshold value of the Weber number is found beyond which its effect on the azimuthal spreading process becomes less obvious. The distinctive axial spreading processes of oil and water are illustrated through high-speed imaging from both front and side perspectives, revealing that droplet oscillation is critically influenced by the Weber number. Our work elucidates the impact dynamics of compound droplets on curved surfaces, providing pivotal insights into related thermal management, droplet printing, and coating fabrication applications.

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Impact of a compound drop on a dry surface

Cited by 14 publications

References 7 publications

Rebound of self-lubricating compound drops

Rebound of self-lubricating compound drops

Ouzo Column under Impact: Formation of Emulsion Jet and Oil-Lubricated Droplet

Compound Droplet Impact on a Thin Hydrophobic Cylinder

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