Prince Rupert's Drop bouncing on high-speed moving superhydrophobic surfaces

Shu, Yifu; Hu, Zhifeng; Feng, Yanhui; Wu, Xiaomin; Dong, Zhichao; Chu, Fuqiang

doi:10.1016/j.icheatmasstransfer.2023.107049

Cited by 7 publications

(1 citation statement)

References 42 publications

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“…Shu et al reported that a high-speed moving superhydrophobic surface reduces the contact time by over 40% and the droplet detaches from the surface in the shape of “Prince Rupert's drop”. 38 Higher motion speeds generate greater challenges for droplet deposition on HM-SHB surfaces, and this is particularly pronounced for motor vehicles and aircraft. None of the additives that are currently considered superior to other additive materials could be deposited on HM-SHB surfaces at the reported dosages, 1,25–28 which mainly can be attributed to the shorter contact time and the higher asymmetry of the impact dynamics, as indicated in Table S1 and Movie S1†.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric deposition on high-speed moving superhydrophobic surfaces

Wang,

Jiang,

Gao

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Asymmetric deposition on high-speed moving superhydrophobic surfaces

Wang,

Jiang,

Gao

et al. 2024

J. Mater. Chem. A

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Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Hu,

Chu,

Shan

et al. 2023

Advanced Materials

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Droplet impact is a ubiquitous liquid behavior that closely tied to human life and production, making indispensable impacts on the big world. Nature‐inspired superhydrophobic surfaces provide a powerful platform for regulating droplet impact dynamics. The collision between classic phenomena of droplet impact and the advanced manufacture of superhydrophobic surfaces is lighting up the future. Accurately understanding, predicting, and tailoring droplet dynamic behaviors on superhydrophobic surfaces are progressive steps to integrate the droplet impact into versatile applications and further improve the efficiency. In this review, the progress on phenomena, mechanisms, regulations, and applications of droplet impact on superhydrophobic surfaces, bridging the gap between droplet impact, superhydrophobic surfaces, and engineering applications are comprehensively summarized. It is highlighted that droplet contact and rebound are two focal points, and their fundamentals and dynamic regulations on elaborately designed superhydrophobic surfaces are discussed in detail. For the first time, diverse applications are classified into four categories according to the requirements for droplet contact and rebound. The remaining challenges are also pointed out and future directions to trigger subsequent research on droplet impact from both scientific and applied perspectives are outlined. The review is expected to provide a general framework for understanding and utilizing droplet impact.

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Heat transfer during droplet impact on a cold superhydrophobic surface via interfacial thermal mapping

Kumar,

Fu,

Szeto

et al. 2024

Droplet

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Undesired heat transfer during droplet impact on cold surfaces can lead to ice formation and damage to renewable infrastructure, among others. To address this, superhydrophobic surfaces aim to minimize the droplet surface interaction thereby, holding promise to greatly limit heat transfer. However, the droplet impact on such surfaces spans only a few milliseconds making it difficult to quantify the heat exchange at the droplet–solid interface. Here, we employ high‐speed infrared thermography and a three‐dimensional transient heat conduction COMSOL model to map the dynamic heat flux distribution during droplet impact on a cold superhydrophobic surface. The comprehensive droplet impact experiments for varying surface temperature, droplet size, and impacting height reveal that the heat transfer effectiveness () scales with the dimensionless maximum spreading radius as , deviating from previous semi‐infinite scaling. Interestingly, despite shorter contact times, droplets impacting from higher heights demonstrate increased heat transfer effectiveness due to expanded contact area. The results suggest that reducing droplet spreading time, as opposed to contact time alone, can be a more effective strategy for minimizing heat transfer. The results presented here highlight the importance of both contact area and contact time on the heat exchange between a droplet and a cold superhydrophobic surface.

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Prince Rupert's Drop bouncing on high-speed moving superhydrophobic surfaces

Cited by 7 publications

References 42 publications

Asymmetric deposition on high-speed moving superhydrophobic surfaces

Asymmetric deposition on high-speed moving superhydrophobic surfaces

Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Heat transfer during droplet impact on a cold superhydrophobic surface via interfacial thermal mapping

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