Dynamics of droplet impact on a superhydrophobic disk
Dynamics of droplet impact on a superhydrophobic disk
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DOI：
10.1063/5.0091277
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发表时间：
2022-06-01
影响因子：
4.6
通讯作者：
Johnson, Zachary
中科院分区：
文献类型：
--
作者：
Moghtadernejad, Sara;Jadidi, Mehdi;Johnson, Zachary
通过实验研究了切向速度对水滴撞击旋转超疏水表面动力学的影响。结果表明，切向速度的增加导致液滴在超疏水表面上由对称形状扩展为不对称形状。此外，根据撞击和切向速度的不同，可以观察到三种行为：反弹、对称飞溅和不对称飞溅。在弹跳区，液滴的接触时间与撞击速度无关，随切向速度的增加而减小。然而，在此区域内的最大扩展直径是撞击速度和切向速度的函数。此外，还引入了一个定义为Ware(1/2)(1-Kre(-1/2)V/U)(2)=K的溅射阈值来估计弹跳溅射、对称溅射和非对称溅射之间的转变。结果表明，本工作(即超疏水旋转盘)的K值比其他研究人员对铝制旋转盘的K值低约60%。此外，还发现k的两个值来定义这三个观察到的区域之间的边界。由AIP出版公司独家授权出版。
An experimental study is performed to investigate the effect of tangential velocity on the dynamics of a water droplet impacting on a spinning superhydrophobic surface. It is revealed that an increase in the tangential velocity results in the spreading of a droplet from symmetrical to asymmetrical shape on the superhydrophobic surface. Moreover, depending on the impact and tangential velocities, three behaviors are observed: bouncing, symmetrical splashing, and asymmetrical splashing. In the bouncing regime, it is found that the droplet contact time is independent of impact velocity and decreases as the tangential velocity increases. However, the maximum spreading diameter in this regime is a function of both the impact and the tangential velocities. Furthermore, a splashing threshold defined as WeRe(1/2)(1 - kRe(-1/2) V/U)(2) = K is introduced to estimate the transition between the bouncing, symmetrical splashing, and asymmetrical splashing regimes. It is revealed that the value of K in the present work (i.e., superhydrophobic spinning disk) is approximately 60% less than the K value obtained by other researchers for the case of aluminum spinning disk. Moreover, two values are found for k to define the boundaries between these three observed regimes. Published under an exclusive license by AIP Publishing.