Splashing behavior of impacting droplets on grooved superhydrophobic surfaces
Splashing behavior of impacting droplets on grooved superhydrophobic surfaces
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DOI：
10.1063/5.0088488
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发表时间：
2022-05-01
影响因子：
4.6
通讯作者：
Liu, Senyun
中科院分区：
文献类型：
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作者：
Guo, Chunfang;Liu, Lei;Liu, Senyun
在水滴撞击水稻叶片状沟槽超疏水表面的过程中，单向纹理可以通过改变水滴撞击动力学来减少固液接触时间。槽的几何形状对碰撞液滴飞溅的影响仍然没有得到揭示。在这项研究中，我们通过实验确定了不同参数的凹槽超疏水表面上的液滴反弹和飞溅制度。液滴在沟槽表面的不对称扩展和收缩，并伴随着明显的液体射流。随着冲击速度的增加，二次液滴从液体射流的边缘喷出，这是液滴飞溅在沟槽超疏水表面上的开始。研究发现，液体射流飞溅的临界韦伯数随槽宽的增大而减小，随液滴直径的增大而增大。进行缩放分析，以模拟飞溅的标准，并解释其依赖于槽参数和液滴属性。该研究推进了对纹理化超疏水表面上的液滴飞溅动力学的理解，这对于一些农业和工业应用是有希望的。由AIP Publishing独家授权出版。
During water droplet impingement onto a rice-leaf-inspired grooved superhydrophobic surface, the unidirectional textures can reduce the solid-liquid contact time through modifying the droplet impact dynamics. The influence of the groove geometry on the splashing of impacting droplets is still unrevealed. In this study, we experimentally identify the droplet bouncing and splashing regimes on grooved superhydrophobic surfaces of varying parameters. Asymmetric spreading and retracting of droplets are observed on the surfaces, accompanied by obvious liquid jets generated within the grooves. As the impact velocity increases, secondary droplets are ejected from the rim of the liquid jets, which is the onset of droplet splashing on the grooved superhydrophobic surfaces. We find that the critical Weber number for the splash of liquid jets decreases with the groove width but increases with the droplet diameter. Scaling analysis is performed to model the splashing criteria and explain its dependence on groove parameters and droplet properties. This research advances the understanding of droplet splashing dynamics on textured superhydrophobic surfaces, which is promising for some agricultural and industrial applications. Published under an exclusive license by AIP Publishing.