The dynamical behaviors of water drop impacting and bouncing on an inclined hydrophobic surface

Guan, Yin; Fu, Jingwei; Wu, Shuang; Yu, Chuanpeng; Chen, Xiyang; Zhou, Cheng

doi:10.1016/j.colsurfa.2021.127087

Cited by 15 publications

(3 citation statements)

References 46 publications

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“…The results reported above confirm that We n controls the lateral spread of the droplet in the second phase. This finding is in accordance with the literature. ,, …”

Section: Results and Discussionsupporting

confidence: 94%

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Droplet Impact and Spreading on Inclined Surfaces

2021

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Introducing surface inclination in the case of droplet impact on solid substrates results in complicated dynamics post impact. The present work investigates the dynamics involved in the spreading phase of the droplet on inclined substrates. Experiments are conducted with water droplets impinging on inclined dry solid substrates with varying wettability values. The results reveal the presence of three phases in the droplet spread behavior. In the first phase, the droplet is observed to depict a close radial symmetry and is dominated by inertia forces. Phase 1 ends when the upstream droplet lamella post impact gets pinned to the surface or starts retracting as a consequence of surface forces becoming dominant. A scaling analysis developed to predict the pinning time of the droplet shows that the pinning time is independent of impact velocity, which is also observed during experiments. The asymmetries in the radial evolution of the droplet appear in phase 2 and become dominant in phase 3. Phase 2 terminates when the droplet attains the maximum lateral spread, which is established as a function of the normal component of the Weber number. Phase 3 is initiated when the droplet starts retracting in the lateral direction while the longitudinal expansion continues. Using an energy-based model constructed to predict the maximum spread, we show that the impact inertia of the droplet controls the longitudinal droplet spread in phases 1 and 2, while the gravity forces are primarily responsible for the droplet spread in phase 3. The model results were validated with the experiments conducted in-house and were found to be in good agreement.

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“…The results reported above confirm that We n controls the lateral spread of the droplet in the second phase. This finding is in accordance with the literature. ,, …”

Section: Results and Discussionsupporting

confidence: 94%

“…This finding is in accordance with the literature. 16,29,30 Figure 6a,b portrays the temporal evolution of the droplet in the longitudinal direction post impact on PMMA and treated glass. As observed, the rate of droplet extension decreased with an increase in α during the initial stages of spread.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Droplet Impact and Spreading on Inclined Surfaces

2021

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“…The spreading speed of the lower edge of water droplets is faster than the upper edge, and the spreading area at the down is larger than that at the up, as shown in Figure 3b. [ 35,36 ] So, the water droplets generate a higher electrical signal on the upper edge of the electrode than on the lower edge, as shown in Figure 2c,d. The higher electrical signal generated by the droplet at the electrode edge is not only driven by the potential difference but also affected by the area change rate of the droplet on both sides of the electrode edge.…”

Section: Resultsmentioning

confidence: 96%

High‐Output Single‐Electrode Droplet Triboelectric Nanogenerator Based on Asymmetrical Distribution Electrostatic Induction Enhancement

Wang

Zhang

Wang

et al. 2023

Small

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Droplet‐based triboelectric nanogenerators (D‐TENGs) have recently gained much attention due to their great potential in harvesting energy. However, the output performance of conventional single‐electrode droplet‐based TENGs is limited owing to low induced electrification efficiency. The asymmetric distribution of electric fields on both sides of the electrode edge enhances the electrostatic induction process and improves the output performance of D‐TENG. Herein, an induced electrification‐enhanced droplet‐based triboelectric nanogenerator (IED‐TENG) is developed to effectively enhance the output performance by simultaneously optimizing the electrode structure and the dynamics of the water droplet. One droplet falling from a height of 30 cm results in a −70 V output voltage and −6 µA short‐circuit current, which is 70 times and 20 times the full‐inductive‐electrode mode, respectively. The working principle and the relationship between electric signal and droplet dynamics are analyzed in detail. Moreover, the peak output voltage can reach −110 V, and the peak current can get −140 µA by using the power generation of multiple water droplets. The present protocol provides an easy and reproducibility strategy in energy harvesting and sensing areas.

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Dynamical behaviors of water drop impact on superhydrophobic surfaces with the macro-textured cavity

Jiang

Zhou

et al. 2023

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The dynamical behaviors of water drop impacting and bouncing on an inclined hydrophobic surface

Cited by 15 publications

References 46 publications

Droplet Impact and Spreading on Inclined Surfaces

Droplet Impact and Spreading on Inclined Surfaces

High‐Output Single‐Electrode Droplet Triboelectric Nanogenerator Based on Asymmetrical Distribution Electrostatic Induction Enhancement

Dynamical behaviors of water drop impact on superhydrophobic surfaces with the macro-textured cavity

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