Abstract A model experiment with a vortex impacting a flexible canopy filled with a thin homogeneous bed of particles is presented. Flexibility of the filaments increases the efficiency of resuspension by the amount it allows the effective canopy-height to reduce due to the reconfiguration of the flexible structures. Scaling of the results with the effective canopy height leads to a collapse of the observed resuspension in the history of several successive impacts. It is further shown that preferential pathways in the canopy play a large role in resuspension. When comparing a hexagonal arrangement to a random arrangement of the filaments at the same average porosity, one needs to double the amount of impacts to achieve the same average resuspension. Hence, it is concluded that the random path of the particles around the filaments is affected in a non-linear manner by the local resistance. Regions of locally sparse arrangements of the filaments cannot balance the trapping effect of particles within regions of dense arrangement in their travel history. Flexibility of the filaments again proves a better resuspension under such conditions.

中文翻译：

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涡流冲击对柔性檐篷中的沉积物侵蚀

摘要 介绍了一个涡流撞击充满薄均匀颗粒床的柔性顶篷的模型实验。由于柔性结构的重新配置，灯丝的柔性通过允许有效顶篷高度降低的量增加了再悬浮效率。结果与有效冠层高度的缩放导致在几次连续撞击的历史中观察到的再悬浮坍塌。进一步表明，冠层中的优先路径在重新悬浮中起着重要作用。当在相同的平均孔隙率下将六边形排列与随机排列的细丝进行比较时，需要将冲击量加倍以实现相同的平均再悬浮。因此，得出的结论是，细丝周围粒子的随机路径以非线性方式受到局部电阻的影响。细丝局部稀疏排列的区域无法平衡粒子在其旅行历史中密集排列区域内的捕获效应。长丝的柔韧性再次证明在这种条件下更好的再悬浮。