论文标题
影响下降何时停止弹跳？
When does an impacting drop stop bouncing?
论文作者
论文摘要
如果它们不太重（Biance等，2006）或太粘稠（Jha等，2020），则无润湿的底物允许撞击液滴散布，后坐力和起飞。在本文中，使用具有流体方法量的直接数值模拟，我们研究了粘性应力和重力如何抑制毛细血管抑制降落反弹的情况。接近弹跳到非爆炸过渡的弹跳，我们证明可以将初始扩散阶段与后来的回缩和起飞分离，从而使反弹理解为将扩散液体的表面能量转化为动能的过程。我们提出了一个类似于聚结的跳跃，我们提出了一个从弹跳到非弹性制度的过渡标准，即，按照$ OH_C + BO_C \ sim 1 $的条件，$ OH_C $和$ oh_c $和$ bo_c $是过渡时的Ohnesorge编号和债券编号。该标准与数值结果非常吻合。我们还阐明了通过计算能量预算并将其与滴剂的形状和内部流相关联，从而限制了重量和粘性限制机制中弹跳抑制的机制。
Non-wetting substrates allow impacting liquid drops to spread, recoil, and takeoff, provided they are not too heavy (Biance et al. 2006) or too viscous (Jha et al. 2020). In this article, using direct numerical simulations with the volume of fluid method, we investigate how viscous stresses and gravity conspire against capillarity to inhibit drop rebound. Close to the bouncing to non-bouncing transition, we evidence that the initial spreading stage can be decoupled from the later retraction and takeoff, allowing to understand the rebound as a process converting the surface energy of the spread liquid into kinetic energy. Drawing an analogy with coalescence induced jumping, we propose a criterion for the transition from the bouncing to the non-bouncing regime, namely by the condition $Oh_c + Bo_c \sim 1$, where $Oh_c$ and $Bo_c$ are the Ohnesorge number and Bond number at the transition, respectively. This criterion is in excellent agreement with the numerical results. We also elucidate the mechanisms of bouncing inhibition in the heavy and viscous drops limiting regimes by calculating the energy budgets and relating them to the drop's shape and internal flow.
