Drag force in immersed granular materials
Drag force in immersed granular materials
复制标题
浸没的颗粒材料中的阻力
DOI：
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发表时间：
2020
影响因子：
2.7
通讯作者：
P. Rognon
中科院分区：
文献类型：
--
作者：
T. Hossain;P. Rognon
我们研究了作用在大型物体上的阻力，这些物体穿过浸入水中的颗粒填料。为此，我们进行了以规定的速度垂直拉出水平板的抬升实验。在这些试验中，我们观察到阻力在低位移时达到峰值，然后衰减。结果表明，峰值阻力随速度的增大而增大，并与板材尺寸和颗粒直径有关。我们确定了这些性质的经验标度律，并引入了一个可以解释它们的达西流动机制。此外，我们还进行了突然停止板块运动的测试，这证明了阻力在时间上逐渐松弛。我们讨论了粘弹塑性力学模拟如何再现这些动力学。这些结果和分析突出了干颗粒材料和浸泡颗粒材料之间阻力的根本差异。
We investigate the drag forces acting on large objects moving through a granular packing immersed in water. In this aim, we conducted uplift experiments involving pulling out horizontal plates at a prescribed velocity vertically. During these tests, we observed that the drag force reaches to peak at a low displacement and then decays. Results show that the peak drag force strongly increases with the velocity and depends on the plate size and grain diameter. We identify empirical scaling laws for these properties and introduce a Darcy-flow mechanism that can explain them. Furthermore, we conducted tests involving suddenly stopping the motion of the plate, which evidenced a progressive relaxation of the drag force in time. We discuss how a visco-elasto-plastic mechanical analogue can reproduce these dynamics. These results and analyses highlight fundamental differences in drag force between dry and immersed granular materials.