Wu Zhenlong, Cao Yihua
National Laboratory of Aeronautics and Astronautics, Beihang University, Beijing, China.
School of Aeronautic Science and Engineering, Beihang University, Beijing, China.
PLoS One. 2017 May 11;12(5):e0177390. doi: 10.1371/journal.pone.0177390. eCollection 2017.
We simulate the onset and evolution of the earliest splashing of an infinite cylindrical liquid drop on a smooth dry solid surface. A tiny splash is observed to be emitted out of the rim of the lamella in the early stage of the impact. We find that the onset time of the splash is primarily dependent on the characteristic timescale, which is defined by the impact velocity as well as the drop radius, with no strong dependence on either the liquid viscosity or surface tension. Three regimes are found to be responsible for different splashing patterns. The outermost ejected droplets keep extending radially at a uniform speed proportional to the impact speed. Finally, we discuss the underlying mechanism which is responsible for the occurrence of the initial drop splash in the study.
我们模拟了无限长圆柱形液滴在光滑干燥固体表面上最早飞溅的起始和演化过程。在撞击的早期阶段，观察到一个微小的飞溅物从薄片边缘喷出。我们发现飞溅的起始时间主要取决于特征时间尺度，该时间尺度由撞击速度和液滴半径定义，对液体粘度或表面张力均无强烈依赖。发现有三种机制导致不同的飞溅模式。最外层喷出的液滴以与撞击速度成正比的均匀速度径向持续扩展。最后，我们讨论了该研究中导致初始液滴飞溅发生的潜在机制。
