Drop Bouncing Dynamics on Ultrathin Films

He, Ziwen; Tran, Huy; Pack, Min

doi:10.1021/acs.langmuir.1c01510

Cited by 8 publications

(1 citation statement)

References 61 publications

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“…Ersoy et al studied the impact dynamics of dyed water droplets on a transparent water film and found that the perturbation created by the droplet impact gives rise to outer surface capillary waves, which control local mixing. He et al demonstrated how the liquid film thickness could influence the outcome of droplet impact, such as droplet bouncing, contact bouncing, and merging. It is found that, in the case of a rebound, there exists a microscopic interfacial gas film that assists the droplet in bouncing.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Control of Water Droplet Impact onto Ferrofluid Lubricated Surfaces

2023

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Controlling the impact process of a droplet impacting a liquid film has remained a wide-open challenge. The existing passive techniques lack precise on-demand control of the impact dynamics of droplets. The present study introduces a magnet-assisted approach to control water droplets’ impact dynamics. We show that by incorporating a thin, magnetically active ferrofluid film, the overall droplet impact phenomena of the water droplets could be controlled. It is found that by modifying the distribution of the magnetic nanoparticles (MNPs) present inside the ferrofluid using a permanent magnet, the spreading and retraction behavior of the droplet could be significantly controlled. In addition to that, we also show that by altering the impact Weber number (We i), and the magnetic Bond number (Bo m), the outcomes of droplet impact could be precisely controlled. We reveal the role of the various forces on the consequential effects of droplet impact with the help of phase maps. Without the magnetic field, we discovered that the droplet impact on ferrofluid film results in no-splitting, jetting, and splashing regimes. On the other hand, the presence of magnetic field results in the no-splitting and jetting regime. However, beyond a critical magnetic field, the ferrofluid film gets transformed into an assembly of spikes. In such scenarios, the droplet impact only results in no-splitting and splashing regimes, while the jetting regime remains absent. The outcome of our study may find potential applications in chemical engineering, material synthesis, and three-dimensional (3D) printing where the control and optimization of the droplet impact process are desirable.

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Section: Introductionmentioning

confidence: 99%

Magnetic Control of Water Droplet Impact onto Ferrofluid Lubricated Surfaces

2023

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An investigation on the impact of two vertically aligned drops on a liquid surface

Paul

Ray

Sahu

et al. 2023

International Journal of Multiphase Flow

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Interface Dynamics at a Four-Fluid Interface during Droplet Impact on a Two-Fluid System

Chowdhury,

Misra,

Mitra

2024

Langmuir

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We investigate the interfacial dynamics involved in the impact of a droplet on a liquid− liquid system, which involves the impingement of an immiscible core liquid drop from a vertical separation onto an interfacial shell liquid layer floating on a host liquid bath. The dynamics have been studied for a wide range of impact Weber numbers and two different interfacial shell liquids of varying volumes. The core drop, upon impact, dragged the interfacial liquid into the host liquid, forming an interfacial liquid column with an air cavity inside the host liquid bath. The dynamics is resolved into cavity expansion and rapid contraction, followed by thinning of the interfacial liquid. The interplay of viscous dissipation, interfacial pull, and core drop inertia influenced the necking dynamics. The viscous dissipation increases with the thickness of the interfacial layer, which depends on the volume and lateral spread over the water. The necking dynamics transitioned from inertia-dominated deep seal closure at higher spread, lower interfacial film volumes, and higher Weber numbers into inertia-capillary-dominated deep seal closure with an increase in film volumes, decrease in the spread of the interfacial fluid, or decrease in Weber number and finally into a no-seal closure at high volumes, low spread, and low Weber numbers.

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Drop Bouncing Dynamics on Ultrathin Films

Cited by 8 publications

References 61 publications

Magnetic Control of Water Droplet Impact onto Ferrofluid Lubricated Surfaces

Magnetic Control of Water Droplet Impact onto Ferrofluid Lubricated Surfaces

An investigation on the impact of two vertically aligned drops on a liquid surface

Interface Dynamics at a Four-Fluid Interface during Droplet Impact on a Two-Fluid System

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