Orientation dynamics of nonspherical particles under surface gravity waves
Orientation dynamics of nonspherical particles under surface gravity waves
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DOI：
10.1103/physrevfluids.4.034301
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发表时间：
2019-03-05
影响因子：
2.7
通讯作者：
Ouellette, Nicholas T.
中科院分区：
文献类型：
--
作者：
DiBenedetto, Michelle H.;Koseff, Jeffrey R.;Ouellette, Nicholas T.
利用三维印刷圆盘和棒进行了表面重力波作用下非球形颗粒取向动力学的实验研究。试验用中性浮力和轻微负浮力的颗粒进行，这些颗粒足够大，由于其有限的尺寸，惯性很重要。虽然粒子的初始取向分布很广，但随着时间的推移，观察到波将这些取向聚焦到与理论一致的优选角度。负浮力颗粒还表现出采取最大化垂直阻力的取向的趋势。总体方向可以被描述为波浪所青睐的方向和沉降所青睐的方向之间竞争的结果。也观察到的平均取向的传播与波强度增加。最后，观察到由于其有限的尺寸，盘状颗粒的面外取向的稳定性。
Experiments were conducted with three-dimensional printed disks and rods to study the orientation dynamics of nonspherical particles under surface gravity waves. Trials were run with both neutrally buoyant and slightly negatively buoyant particles, which were large enough that inertia due to their finite size was important. Although the particles had a broad distribution of initial orientations, over time the waves were observed to focus these orientations toward a preferred angle that agreed with theory. Negatively buoyant particles additionally exhibited a tendency to adopt an orientation that maximized vertical drag. The overall orientation can be described as the result of a competition between the orientation favored by waves and the orientation favored by settling. The spread about the mean orientation was also observed to increase with wave strength. Finally, the stabilization of out-of-plane orientations of disk-shaped particles was observed due to their finite size.