Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves

Hosseini Biroun, Seyedmehdi, Rahmati, Mohammad, Tao, Ran, Torun, Hamdi, Jangi, Mehdi and Fu, Richard (2020) Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves. Langmuir, 36 (34). pp. 10175-10186. ISSN 0743-7463

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Official URL: https://doi.org/10.1021/acs.langmuir.0c01628


Droplet impact on arbitrary inclined surfaces is of great interest for applications such as antifreezing, self-cleaning, and anti-infection. Research has been focused on texturing the surfaces to alter the contact time and rebouncing angle upon droplet impact. In this paper, using propagating surface acoustic waves (SAWs) along the inclined surfaces, we present a novel technique to modify and control key droplet impact parameters, such as impact regime, contact time, and rebouncing direction. A high-fidelity finite volume method was developed to explore the mechanisms of droplet impact on the inclined surfaces assisted by SAWs. Numerical results revealed that applying SAWs modifies the energy budget inside the liquid medium, leading to different impact behaviors. We then systematically investigated the effects of inclination angle, droplet impact velocity, SAW propagation direction, and applied SAW power on the impact dynamics and showed that by using SAWs, droplet impact on the nontextured hydrophobic and inclined surface is effectively changed from deposition to complete rebound. Moreover, the maximum contact time reduction up to ∼50% can be achieved, along with an alteration of droplet spreading and movement along the inclined surfaces. Finally, we showed that the rebouncing angle along the inclined surface could be adjusted within a wide range.

Item Type: Article
Additional Information: Funding information: The authors thank The UK Engineering and Physical Sciences Research Council (EPSRC) grants EP/P018998/1, Special Interest Group of Acoustofluidics from UK Fluids Network (EP/N032934/1), Newton Mobility Grant (IE161019) through Royal Society and the National Natural Science Foundation of China.
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 24 Sep 2020 15:42
Last Modified: 07 Aug 2021 03:30
URI: http://nrl.northumbria.ac.uk/id/eprint/44259

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