A review of liquid droplet impacting onto solid spherical particles: A physical pathway to encapsulation mechanisms

Khojasteh, Danial; Kazerooni, Nooshin Moradi; Marengo, Marco

doi:10.1016/j.jiec.2018.11.030

Cited by 65 publications

(14 citation statements)

References 69 publications

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“…As shown in the figure, the maximum spreading diameter enhances with an increase in the impingement velocity, which is associated with the kinetic energy of a droplet impacting onto the solid substrate. This result is met with previous studies [59][60][61][62][63]. The droplet shapes for different values of impact velocities are illustrated in Fig.…”

Section: Effects Of Electric Field On Droplet Impact Dynamicssupporting

confidence: 86%

Electrically modulated droplet impingement onto hydrophilic and (super)hydrophobic solid surfaces

Khojasteh

Manshadi

Mousavi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Although the impact of impinging droplets on solid substrates has been widely studied, any possible non-trivial interaction between the substrate wettability and applied electric field toward altering the underlying dynamical characteristics remains unexplored. In this study, the interaction between electric field and hydrodynamic transport, toward influencing the dynamic behavior of a water droplet, dispersed in an immiscible fluid, on solid substrates has been numerically investigated. Finite element simulations were performed with a conservative level-set method to track the liquid-liquid interface. The numerical method is first validated with the available experimental data. After ensuring the accuracy of the simulation method, the effects of variations in impact velocity, electric field strength, electric permittivity of the surrounding liquid, and substrate wettability have been studied to clarify the underlying physics of this problem. These results may turn out to be of profound importance toward understanding the functionalities of various practical applications and manipulating the droplet dynamics through surface wettability-electric field interaction over the relevant spatiotemporal scales.

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Section: Effects Of Electric Field On Droplet Impact Dynamicssupporting

confidence: 86%

Electrically modulated droplet impingement onto hydrophilic and (super)hydrophobic solid surfaces

Khojasteh

Manshadi

Mousavi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…These studies focus on the droplets bouncing dynamics on curved surfaces 13 , 14 , dynamics of liquid lamella or sheets after droplet impact onto a small target 15 – 19 or close to an edge 20 – 22 , and droplet capturing 23 or climbing 24 on a thin fibre. Studies regarding droplet impact onto a solid sphere have focused on several aspects including droplet spreading and retraction, bouncing dynamics, splashing, and the dynamics of the lamella 25 – 29 . A number of recent studies have also investigated the droplet impact onto a single stand-alone solid structure embedded upon a surface or onto surfaces with macro-textures 30 .…”

Section: Introductionmentioning

confidence: 99%

Air entrapment and bubble formation during droplet impact onto a single cubic pillar

Ren

Foltyn

Geppert

2021

Sci Rep

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We study the vertical impact of a droplet onto a cubic pillar of comparable size placed on a flat surface, by means of numerical simulations and experiments. Strikingly, during the impact a large volume of air is trapped around the pillar side faces. Impingement upon different positions of the pillar top surface strongly influences the size and the position of the entrapped air. By comparing the droplet morphological changes during the impact from both computations and experiments, we show that the direct numerical simulations, based on the Volume of Fluid method, provide additional and new insight into the droplet dynamics. We elucidate, with the computational results, the three-dimensional air entrapment process as well as the evolution of the entrapped air into bubbles.

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“…Droplet impact is a common but significant phenomenon in daily life and industry. The studies on it have been conducted by many scholars [1][2][3][4][5], the majority of which is about single-droplet impact. While in most industrial applications, e.g., spray cooling, multi-droplet impact occurs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Eccentric Distance on Successive Dual-droplet Impacting a Super-hydrophobic Tube

et al. 2021

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Droplet impact is a common but significant phenomenon in industry. The CLSVOF (coupled level set and volume-of-fluid) method is used to numerically study the successive dual-droplet impacting a super-hydrophobic tube. For the impact velocity of 1.0 m/s, the effect of the eccentric distance on dynamic characteristics is analysed, the corresponding eccentric distances are 0.5, 1.0 and 2.0, respectively. In addition, the break-up during rebound is analysed with velocity field and pressure nephogram. Results show that, the eccentric distance hinders the spread during the initial period of spreading. With the increase in eccentric distance, more liquid gathers at the eccentric side and the liquid film might rebound easily without break-up under the same impact velocity. The break-up during rebound mainly depends on the local airflow and pressure difference. The high-pressure zone near the solid-liquid interface moves towards the eccentric side with the increase in eccentric distance.

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A review of liquid droplet impacting onto solid spherical particles: A physical pathway to encapsulation mechanisms

Cited by 65 publications

References 69 publications

Electrically modulated droplet impingement onto hydrophilic and (super)hydrophobic solid surfaces

Electrically modulated droplet impingement onto hydrophilic and (super)hydrophobic solid surfaces

Air entrapment and bubble formation during droplet impact onto a single cubic pillar

Effect of Eccentric Distance on Successive Dual-droplet Impacting a Super-hydrophobic Tube

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