Molecular Dynamics Simulation of Dual Nanodroplet Impacts on a Cylindrical Surface

Liu, Xuanchen; Liu, Liansheng; Li, Rongji; Xie, Jun; Chen, Yadong

doi:10.1021/acs.langmuir.4c01655

Langmuir

2024

DOI: 10.1021/acs.langmuir.4c01655

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Molecular Dynamics Simulation of Dual Nanodroplet Impacts on a Cylindrical Surface

Xuanchen Liu,

Liansheng Liu,

Rongji Li

et al.

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2024

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Cited by 2 publications

References 71 publications

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Vibration-Induced Pancake Bouncing of Impacting Droplets on Hydrophobic Surfaces

Ren,

Hu,

Wang

et al. 2024

Langmuir

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Rapid detachment of impacting droplets from solid surfaces is fundamentally interesting and important in many practical applications, including self-cleaning, anti-icing, and energy harvesting. The droplet pancake bouncing is strongly preferred for the reduced contact time and high bouncing velocity. However, the trigger conditions for pancake bouncing are rigorous. Driven by this, this work circumvents the limitations via solid surface vibration. Our results show that the impacting droplet patterns are highly sensitive to the surface vibration parameters (i.e., the vibration amplitude and frequency), and only a reasonable design of vibration parameters enables the impacting droplets to bounce in a pancake shape without the contraction stage. Intriguingly, the pancake bouncing induced by surface vibration exhibits a significant reduction of solid−liquid contact time (up to ≈80%) compared to the traditional bouncing pattern, and the bouncing velocity has been dramatically enhanced. Furthermore, the critical conditions for the pancake bouncing on the hydrophobic surface and the underlying dynamic mechanism are also identified. This work provides an effective method to achieve well-controlled pancake bouncing of impacting droplets for extensive applications.

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Vibration-Induced Pancake Bouncing of Impacting Droplets on Hydrophobic Surfaces

Ren,

Hu,

Wang

et al. 2024

Langmuir

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Impact and freezing characteristics of deionized water droplets on cold curved surfaces

Liu,

et al. 2024

International Journal of Fluid Engineering

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Processes involving droplet impact and subsequent freezing occur widely in practical engineering applications. In the present study, a visualization experimental setup is utilized to investigate the effects of the impact of single millimeter-scale droplets on curved surfaces at room and low temperatures. The influences of the Weber number We, wall temperature, and wall wettability on the dynamics of droplet impact and the characteristics of ice formation are examined. The morphological evolution of droplet impact and the variations of the dimensionless spreading coefficient are analyzed. The results indicate that at high We (We = 277), droplets reach their maximum spread on cold walls in a shorter time than on room-temperature walls, and their peak spreading coefficient is smaller. Upon impact with a cold wall, droplets exhibit a spread–splatter behavior. Low temperatures suppress the oscillatory behavior of droplets on a curved wall. In the case of a hydrophilic wall surface, as the impact We increases from 42 to 277, the impact mode gradually transitions from spread–retract–freeze to spread–splatter–freeze. The maximum spreading coefficient first increases and then decreases with increasing impact We. At high We (We = 277), the wall wettability has a minimal effect on the dynamics of droplet impact and freezing, with a spread–splatter–freeze mode being exhibited for both hydrophobic and hydrophilic walls, and the final freezing morphology is similar.

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Molecular Dynamics Simulation of Dual Nanodroplet Impacts on a Cylindrical Surface

Cited by 2 publications

References 71 publications

Vibration-Induced Pancake Bouncing of Impacting Droplets on Hydrophobic Surfaces

Vibration-Induced Pancake Bouncing of Impacting Droplets on Hydrophobic Surfaces

Impact and freezing characteristics of deionized water droplets on cold curved surfaces

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