Jetting from an impacting drop containing a particle

Zhao, Weiwei; Lin, Shiji; Chen, Longquan; Li, Erqiang; Thoroddsen, Sigurður T.; Thoraval, Marie-Jean

doi:10.1063/1.5139534

Cited by 21 publications

(3 citation statements)

References 47 publications

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“…In Figure a, the restitution coefficients of all complete rebounds that we investigated are plotted as a function of the Weber number and the impact velocity. The scatter of the data shown in the figure is an inevitable phenomenon of experimental investigations of multiphase free-surface flows, including the impact of liquid droplets on solid surfaces, − where the underlying hydrodynamics are very complex. , The scatter of the restitution coefficient at low Weber numbers is also enhanced by the existence of inevitable surface defects due to the dominant role of the droplet–surface friction in energy dissipation, though much care has been taken in the surface fabrication. Indeed, existing studies of bouncing droplets on hot surfaces above the Leidenfrost temperature ,, and on sublimation solid surfaces such as dry ice, , where the impinging droplets are always suspended on a thin gas layer without contact with the solid surfaces, reported weakly scattered experimental data of diverse impact characteristics.…”

Section: Results and Discussionmentioning

confidence: 99%

Successive Rebounds of Impinging Water Droplets on Superhydrophobic Surfaces

et al. 2022

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When a water droplet strikes a superhydrophobic surface, there may be several to a few tens of rebounds before it comes to rest. Although this intriguing multiphase flow phenomenon has received a great deal of attention from interfacial scientists and engineers, the underlying dynamics have not yet been completely resolved. In this paper, we report on an experimental investigation into the bouncing behavior of water droplets impinging on macroscopically flat superhydrophobic surfaces. We show that the restitution coefficient, which quantifies the energy consumed during impact and rebound, exhibits a nonmonotonic dependence on the Weber number. It is the droplet–surface friction that restricts the rebound height of the impinging droplet, so its restitution coefficient increases with the Weber number when the impact velocity is below a critical value. Above this value, the viscous friction within a thin liquid layer close to the superhydrophobic surface becomes dominant, and thus, the restitution coefficient decreases sharply. On the basis of energy analyses, semiempirical formulas are proposed to describe the restitution coefficient, and these can be employed to predict the number of successive rebounds of impinging droplets on superhydrophobic surfaces.

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Section: Results and Discussionmentioning

confidence: 99%

Successive Rebounds of Impinging Water Droplets on Superhydrophobic Surfaces

et al. 2022

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“…Here, the variables ρ, γ, and η denote the experimental fluids' density, surface tension, and dynamic viscosity, respectively. Most recently, Zhao et al 43 have reported that high-speed liquid jetting during the impact of a droplet containing a spherical particle occurs when the liquid along the solid surface experiences radial-focusing in the air cavity engendered by the rebounding particle previously. On the contrary, the columnar jet is formed on solid surfaces as we increase the impact velocity beyond the singular jet regime.…”

Section: ■ Introductionmentioning

confidence: 99%

Jetting Dynamics of Viscous Droplets on Superhydrophobic Surfaces

Sarma,

Basu,

Dalal

2023

Langmuir

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We investigated the dynamics of liquid jets engendered by the impact of droplets on a fractal superhydrophobic surface. Depending on the impact conditions, jets emanate from the free liquid surface with several different shapes and velocities, sometimes accompanied by droplet ejection. Experimental outcomes exhibit two different regimes: the singular jet and columnar jet. We found that droplet impacts at a lower impact velocity and low viscosity result in singular jets, attaining a maximum velocity nearly 20-fold higher than the impact velocity. The high-speed video frames reveal that the formation and subsequent collapse of the cylindrical air cavities within the droplet favor the formation of these high-speed singular jets. In contrast, the capillary wave focusing engenders columnar jets at a moderate to high impact velocity. With an increase in viscosity, singular jets are suppressed at lower impact velocities, whereas columnar jets are seen regularly. The columnar jets ascend and grow over time, feeding a bulbous mass, and subsequently the bulb separates itself from the parent jet due to capillary pinch-off phenomena. The quantitative analysis shows that columnar jets' top jet drop size varies nonmonotonically and is influenced by preceding jetting dynamics. At moderate viscosity, the drop size varies with jet velocity, following a power-law scaling. At very high viscosities, both singular and columnar jetting events are inhibited. The results are relevant to several recent technologies, including microdispensing, thermal management, and disease transmission.

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“…In the automotive industry, particle-fluid interactions and flow of particulate matter in thermal multiphase fluidic environments affect the design of combustion chambers and cyclone separators, as nano-to micron-size particles enhance the heat transfer in fluidic systems [4,5,6]. In industrial processes such as inkjet printing [7,8], additive manufacturing of ceramics and cement [9], and cosmetics [10], the impact of a liquid drop containing solid particles on solid surfaces affects the deposition and splashing dynamics, in which particle-to-droplet size ratio and particle's wettability play critical roles [11]. In biomedical fields, the geometric shape, size, deformability, concentration, and surface properties are critical design parameters for engineered particles [12] used for optimal deliveries of nanomedicine and chemotherapeutics to targeted tumor cells for enhanced treatments [13,14,15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

A Review on Contact and Collision Methods for Multi-Body Hydrodynamic Problems in Complex Flows

Karimnejad¹,

Delouei²,

Başağaoğlu³

et al. 2022

CICP

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Modeling and direct numerical simulation of particle-laden flows have a tremendous variety of applications in science and engineering across a vast spectrum of scales from pollution dispersion in the atmosphere, to fluidization in the combustion process, to aerosol deposition in spray medication, along with many others. Due to their strongly nonlinear and multiscale nature, the above complex phenomena still raise a very steep challenge to the most computational methods. In this review, we provide comprehensive coverage of multibody hydrodynamic (MBH) problems focusing on particulate suspensions in complex fluidic systems that have been simulated using hybrid Eulerian-Lagrangian particulate flow models. Among these hybrid models, the Immersed Boundary-Lattice Boltzmann Method (IB-LBM) provides mathematically simple and computationally-efficient algorithms for solid-fluid hydrodynamic interactions in MBH simulations. This paper elaborates on the mathematical framework, applicability, and limitations of various 'simple to complex' representations of close-contact interparticle interactions and collision methods, including short-range interparticle and particle-wall steric interactions, spring and lubrication forces, normal and oblique collisions, and mesoscale molecular models for deformable particle collisions based on hard-sphere and soft-sphere models in MBH models to simulate settling or flow of nonuniform particles of different geometric shapes and sizes in diverse fluidic systems.

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Jetting from an impacting drop containing a particle

Cited by 21 publications

References 47 publications

Successive Rebounds of Impinging Water Droplets on Superhydrophobic Surfaces

Successive Rebounds of Impinging Water Droplets on Superhydrophobic Surfaces

Jetting Dynamics of Viscous Droplets on Superhydrophobic Surfaces

A Review on Contact and Collision Methods for Multi-Body Hydrodynamic Problems in Complex Flows

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