论文标题
气泡的反弹运动与倾斜的墙相撞
Backflipping motion of air bubbles colliding with a tilted wall
论文作者
论文摘要
固体颗粒与表面的倾斜碰撞一直是牛顿力学中广泛研究的话题，这在某种程度上也解释了气泡和液滴的运动。在这里，我们观察到气泡与倾斜表面碰撞时会表现出反弹行为。我们的实验表明，半径为0.6-0.7毫米的气泡与表面以3^o的最大后反转为15^o的表面碰撞时会经历反转。粒子图像速度法表明，反转行为是由气泡周围唤醒引起的循环引起的，该循环在气泡上施加了升力力。我们开发了一个理论模型，该模型结合了潜在的流程理论，以表征由弹跳气泡及其唤醒之间的相互作用引起的循环。理论上的结果与实验非常吻合，证实了唤醒引起的升力力在反转中的关键作用。最后，我们表明，可以利用气泡的后反转行为来可持续清洁涂有蛋白质溶液的生物表面。
Oblique collision of solid particles with surfaces has been a topic of extensive study in Newtonian mechanics, which also explains the motion of bubbles and droplets to some extent. Here, we observe that air bubbles exhibit a backflipping behavior when they collide with a tilted surface. Our experiments reveal that bubbles with radii 0.6-0.7 mm undergo backflipping when they collide with surfaces at an angle of up to 15^o with the strongest backflipping at 3^o. Particle image velocimetry reveals that the backflipping behavior is caused by wake-induced circulation around the bubble, which applies a lift force on the bubble. We develop a theoretical model that incorporates potential flow theory to characterize the circulation caused by the interaction between the bouncing bubble and its wake. The theoretical results are in good agreement with the experiments confirming the key role of the wake-induced lift force in backflipping. Finally, we show that the backflipping behavior of air bubbles can be leveraged for sustainable cleaning of a biological surface coated with a protein solution.
