Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves.
Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves.
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DOI：
10.1021/acs.langmuir.0c01628
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发表时间：
2020-09-01
期刊：
影响因子：
--
通讯作者：
Fu Y
中科院分区：
文献类型：
--
作者：
H Biroun M;Rahmati M;Tao R;Torun H;Jangi M;Fu Y
液滴在任意倾斜表面上的撞击对于诸如防冻、自清洁和抗感染的应用具有极大的兴趣。研究已经集中在纹理化的表面上，以改变接触时间和反弹角度后，液滴的影响。在本文中，使用传播表面声波（SAWs）沿着倾斜表面，我们提出了一种新的技术来修改和控制关键的液滴的冲击参数，如冲击制度，接触时间，和反弹方向。建立了一种高保真的有限体积法，研究了声表面波辅助下液滴撞击倾斜表面的机理。数值计算结果表明，应用SAW改变了液体介质内的能量预算，导致不同的冲击行为。然后，我们系统地研究了倾斜角度，液滴的冲击速度，SAW传播方向，并施加SAW功率的影响动力学，并表明，通过使用SAW，液滴的非纹理疏水性和倾斜的表面上的冲击有效地改变从沉积到完全反弹。此外，可以实现最大接触时间减少高达50%，沿着改变液滴沿着倾斜表面的扩散和移动。最后，我们表明，反弹角沿着倾斜表面可以在很大范围内调整。
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.
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