Modeling the dynamics of partially wetting droplets on fibers
Modeling the dynamics of partially wetting droplets on fibers
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DOI：
10.1103/physrevfluids.7.103606
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发表时间：
2022-10
影响因子：
2.7
通讯作者：
Raymond Christianto;Yudi Rahmawan;C. Semprebon;H. Kusumaatmaja
中科院分区：
文献类型：
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作者：
Raymond Christianto;Yudi Rahmawan;C. Semprebon;H. Kusumaatmaja
利用格子Boltzmann方法模拟了部分润湿液滴在重力驱动下沿光纤沿着运动的动力学过程。对于所谓的蛤壳形态，我们发现三种可能的动态制度后，改变液滴键数和纤维半径：紧凑的液滴，液滴分裂，液滴振荡。对于小的邦德数，在紧凑的液滴制度，液滴达到一个稳定的状态，其速度与驱动体力成线性比例。我们发现两个缩放定律取决于液滴的大小是更小还是更大相比，纤维半径。此外，我们进一步确定了适用于桶形态的标度律。对于更高的邦德数，在液滴分裂制度，卫星液滴形成尾随初始移动液滴。我们发现这种液滴卫星的形成是更容易与增加纤维曲率（较小的纤维半径）。最后，在液滴振荡状态下，有利于在纤维半径的中间范围内，液滴形状周期性地沿着纤维沿着伸展和收缩。
We simulate gravity-driven dynamics of partially wetting droplets moving along a fiber using the lattice Boltzmann method. For the so-called clamshell morphology, we find three possible dynamic regimes upon varying the droplet Bond number and the fiber radius: compact droplet, droplet breakup, and droplet oscillation. For small Bond numbers, in the compact droplet regime, the droplet reaches a steady state and its velocity scales linearly with the driving body force. We find two scaling laws depending on whether the droplet size is smaller or larger compared to the fiber radius. In addition, we further identify a scaling law applicable for the barrel morphology. For higher Bond numbers, in the droplet breakup regime, satellite droplets are formed trailing the initial moving droplet. We find such droplet satellite formation is easier with increasing fiber curvature (smaller fiber radius). Finally, in the droplet oscillation regime, favored in the midrange of fiber radius, the droplet shape periodically extends and contracts along the fiber.