论文标题
在浸入颗粒材料中拖动力
Drag force in immersed granular materials
论文作者
论文摘要
我们调查作用在浸入水中的颗粒堆积的大物体上的阻力力。在此目标中，我们进行了提升实验，涉及在规定的速度上垂直拉出水平板。在这些测试中，我们观察到，阻力在低位移然后腐烂时达到峰值。结果表明，峰值阻力随着速度而大大增加，并取决于板尺寸和晶粒直径。我们确定了这些特性的经验缩放定律，并引入了可以解释它们的Darcy-Flow机制。此外，我们进行了涉及突然停止板运动的测试，这证明了及时的阻力逐渐放松。我们讨论粘性弹塑性机械模拟如何重现这些动力学。这些结果和分析凸显了干燥和浸入颗粒材料之间阻力的基本差异。
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.
