Enhancing drop deposition on solid surfaces has received significant attention in various fields. Breaking the circular symmetry in typical impact dynamics has opportunities for altering the mass and momentum distributions significantly and improving the deposition. Here, we study the impact dynamics of ellipsoidal drops on nonwetted solid surfaces to reduce the bounce magnitude as a function of the impact angle and ellipticity. Experimental and numerical studies reveal that the ellipsoidal drop with the impact angle shows a strong reduction in the maximum bounce height, compared with the spherical drops. The oblique drop impact exhibits a remarkable feature of the off-axis aligning process caused by asymmetric retraction dynamics. Axial momentum analyses help us to interpret the underlying principle behind the peculiar retraction dynamics and establish a transition map of the rebound and deposition for varying angles and ellipticities. We believe that a breakup of the symmetry in the dynamics can provide practical implications for the control of drop deposition in diverse applications, such as spraying, coating, and cooling.

中文翻译：

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通过改变椭圆形液滴的撞击角度来控制固体表面的回弹

在固体表面上增强液滴沉积已在各个领域引起了广泛的关注。在典型的冲击动力学中打破圆形对称性有机会显着改变质量和动量分布并改善沉积。在这里，我们研究椭圆形液滴在未润湿的固体表面上的冲击动力学，以减小反弹角度，该反弹幅度是冲击角和椭圆率的函数。实验和数值研究表明，与球形液滴相比，具有冲击角的椭圆形液滴显示最大弹跳高度明显减小。倾斜的跌落冲击表现出由非对称回缩动力学引起的离轴对准过程的显着特征。轴向动量分析可帮助我们解释独特的回缩动力学背后的基本原理，并为不同角度和椭圆率的回弹和沉积建立过渡图。我们相信，动力学中对称性的破坏可以为控制各种应用中的液滴沉积（例如喷涂，涂覆和冷却）提供实际意义。