The rebound behaviors of multiple droplets simultaneously impacting a superhydrophobic surface were investigated via lattice Boltzmann method (LBM) simulations. Three rebound regions were identified, i.e., an edge-dominating region, a center-dominating region, and an independent rebound region. The occurrence of the rebound regions strongly depends on the droplet spacing and the associated Weber and Reynolds numbers. Three new rebound morphologies, i.e., a pin-shaped morphology, a downward comb-shaped morphology, and an upward comb-shaped morphology, were presented. Intriguingly, in the edge-dominating region, the central droplets experience a secondary wetting process to significantly prolong the contact time. However, in the center-dominating region, the contact time is dramatically shortened because of the strong interactions generated by the central droplets and the central ridges. These findings provide useful information for practical applications such as self-cleaning, anticorrosion, anti-icing, and so forth.

中文翻译：

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多个液滴同时撞击超疏水表面的回弹行为

通过格子玻尔兹曼方法 (LBM) 模拟研究了多个液滴同时撞击超疏水表面的回弹行为。确定了三个回弹区域，即边缘主导区域、中心主导区域和独立回弹区域。回弹区的出现很大程度上取决于液滴间距和相关的韦伯数和雷诺数。提出了三种新的回弹形态，即针状形态、向下梳状形态和向上梳状形态。有趣的是，在边缘主导区域，中心液滴经历了二次润湿过程，从而显着延长了接触时间。然而，在中心主导区域，由于中心液滴和中心脊产生的强相互作用，接触时间显着缩短。这些发现为实际应用提供了有用的信息，例如自清洁、防腐、防冰等。