Droplet Bouncing: Fundamentals, Regulations, and Applications

Han, Xing; Li, Jiaqian; Tang, Xin; Li, Wei; Zhao, Haibo; Yang, Ling; Wang, Liqiu

doi:10.1002/smll.202200277

Cited by 52 publications

(29 citation statements)

References 249 publications

(388 reference statements)

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Section: Resultsmentioning

confidence: 99%

“…53 In these cases, by increasing the droplet diameter, the Ohnesorge number, i.e., the ratio of viscous forces to the inertia and surface tension forces, decreases and enhances the bouncing dynamics. 31,54 Energy Cycle. The droplet bouncing process involves multiple energy conversion cycles, as shown in Figure 5.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The droplet bouncing through droplet coalescence or impact collisions is promoted by increasing the droplet diameter but suppressed by decreasing it . In these cases, by increasing the droplet diameter, the Ohnesorge number, i.e., the ratio of viscous forces to the inertia and surface tension forces, decreases and enhances the bouncing dynamics. , …”

Section: Resultsmentioning

confidence: 99%

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Electrically Induced Liquid Metal Droplet Bouncing

et al. 2022

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Liquid metals, including eutectic gallium–indium (EGaIn), have been explored for various planar droplet operations, including droplet splitting and merging, promoting their use in emerging areas such as flexible electronics and soft robotics. However, three-dimensional (3D) droplet operations, including droplet bouncing, have mostly been limited to nonmetallic liquids or aqueous solutions. This is the first study of liquid metal droplet bouncing using continuous AC electrowetting through an analytical model, computational fluid dynamics simulation, and empirical validation to the best of our knowledge. We achieved liquid metal droplet bouncing with a height greater than 5 mm with an actuation voltage of less than 10 V and a frequency of less than 5 Hz. We compared the bouncing trajectories of the liquid metal droplet for different actuation parameters. We found that the jumping height of the droplet increases as the frequency of the applied AC voltage decreases and its amplitude increases until the onset of instability. Furthermore, we model the attenuation dynamics of consecutive bouncing cycles of the underdamped droplet bouncing system. This study embarks on controlling liquid metal droplet bouncing electrically, thereby opening a plethora of new opportunities utilizing 3D liquid metal droplet operations for numerous applications such as energy harvesting, heat transfer, and radio frequency (RF) switching.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Electrically Induced Liquid Metal Droplet Bouncing

et al. 2022

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“…It has been reported that rougher macrostructures make the surface more hydrophilic, and the micro-/nanostructures produce the reverse consequences. 38 In this way, E. indica leaf surface seems more hydrophilic than E. crusgalli and S. viridis, while it is also affected by the chemical compositions of the leaves. Besides, some long prickles distribute sparsely on the surface (Figure 1C 4 ).…”

Section: Measurement Of Surface Tension and Adhesivementioning

confidence: 98%

Improved Method to Characterize Leaf Surfaces, Guide Adjuvant Selection, and Improve Glyphosate Efficacy

Zhang

Wang

et al. 2023

J. Agric. Food Chem.

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Glyphosate, one of the most widely used herbicides, plays an important role in controlling weeds and ensuring crop production. While using glyphosate, adjuvants are commonly added to improve its deposition on weeds and control efficacy. However, changes in weed leaf surface characteristics may reduce glyphosate penetration and contribute to evolved glyphosate resistance. Therefore, it is significant to introduce an improved method for regularizing leaf surface characterization and guide adjuvant selection to improve glyphosate efficacy. In this work, surface characteristics of typical weed leaves have been systematically investigated by 3D surface analysis and scanning electron microscopy, finally quantified by apparent surface free energy (ASFE) due to its comprehensive and quantitative evaluation of leaf surfaces. Moreover, the relationship between the weed leaf surface characteristics and the retention of glyphosate on weeds was established, further related to the control efficacy against weeds. To maximize the utilization rate of glyphosate, the types and concentrations of adjuvants should be regulated according to the ASFE of weeds. Our findings not only regularize the surface properties of weed leaves but also reveal their influencing mechanism on the deposition and biological activity of glyphosate, which provide effective guidance for the use of glyphosate.

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“…The impingement of the compound drop, such as Janus, core-shell, and particle-laden configurations, can bring more opportunities for applications owing to their particularities and numerous combinations of complex drops and complex surfaces [7,8]. Extensive studies have been carried out to investigate the mechanisms of the drop bouncing and the methods for bouncing promotion or suppression [9,10]. The drop dynamics can be governed by the theoretical Rayleigh limit given by…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Bounce and Separation Dynamics of Janus Drop on Macrotextured Surface

Choi

Yun

2022

Polymers

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Janus drops are thermodynamically stable when a high-viscosity fluid is imposed on a low-viscosity fluid. To understand physical mechanisms in Janus drop impact on macrotextured surfaces, several challenges in finding parameters or strategies still remain. Here, this study investigates the asymmetric bounce and separation of impinging Janus drops on non-wettable surfaces decorated with a macroridge to explore the effect of the drop size, viscosity ratio, and ridge size on the dynamics. Through numerical simulations, we determine the threshold Weber number, above which separation occurs, by varying drop diameters and viscosity ratios of the Janus drops. We investigate the initial bouncing directions of separated drops as a function of the impact velocity and viscosity ratio. We also predict how the separation efficiency is affected by the ridge’s height and width. The asymmetric impact dynamics of Janus drops on macrotextured surfaces can provide new strategies to control drop bouncing in applications, such as liquid separation and purification.

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Droplet Bouncing: Fundamentals, Regulations, and Applications

Cited by 52 publications

References 249 publications

Electrically Induced Liquid Metal Droplet Bouncing

Electrically Induced Liquid Metal Droplet Bouncing

Improved Method to Characterize Leaf Surfaces, Guide Adjuvant Selection, and Improve Glyphosate Efficacy

Characterizing the Bounce and Separation Dynamics of Janus Drop on Macrotextured Surface

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