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arXiv 2008.08343physics.flu-dyn
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旋转液滴在Head-on Collision中的非轴对称流动特性

Non-axisymmetric flow characteristics in Head-on Collision of Spinning Droplets

Chengming He, Peng Zhang

摘要:

采用流体体积法,研究了旋转运动对旋转液滴与非旋转液滴迎面碰撞时的弹跳和聚并过程的影响。一个突出的发现是,旋转液滴可以诱导显着的非轴对称流动的特点,由相同的液体组成的相同大小的液滴的迎面碰撞。具体地说,观察到非轴对称的反弹,它是由旋转角动量到轨道角动量的转换引起的。该过程伴随着由于液滴的旋转流和径向流之间的相互作用而导致的旋转动能损失。实验还观察到了非轴对称的内部流动和暂时合并后的延迟分离现象,这是由界面振荡增强和内部流动诱导的粘性耗散引起的。旋转运动也可以促进液滴的质量混合,因为局部不均匀的质量交换发生在碰撞的早期阶段,由非轴对称流动,并在碰撞后期沿细丝进一步拉伸。此外,还发现液滴初始平移运动和旋转运动的正交性越强,非轴对称流动特征越明显。

英文摘要:

Effects of spinning motion on the bouncing and coalescence between a spinning droplet and a non-spinning droplet undergoing the head-on collision were numerically studied by using a Volume-of-Fluid method. A prominent discovery is that the spinning droplet can induce significant non-axisymmetric flow features for the head-on collision of equal-size droplets composed of the same liquid. Specifically, a non-axisymmetric bouncing was observed, and it is caused by the conversion of the spinning angular momentum into the orbital angular momentum. This process is accompanied by the rotational kinetic energy loss due to the interaction between the rotational and radial flows of the droplets. A non-axisymmetric internal flow and a delayed separation after temporary coalescence were also observed, and they are caused by the enhanced interface oscillation and internal-flow-induced viscous dissipation. The spinning motion can also promote the mass interminglement of droplets because the locally non-uniform mass exchange occurs at the early collision stage by non-axisymmetric flow and is further stretched along the filament at later collision stages. In addition, it is found that the non-axisymmetric flow features increase with increasing the orthogonality of the initial translational motion and the spinning motion of droplets.

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