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Cylindrical sand pile formation in spinning vertical container partially filled with water

机译：部分装有水的旋转立式容器中的圆柱形砂桩形成

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Within the scope of this study we report the formation of a cylindrical sand pile in a container rotating around a vertical axis. A steady stream of dry sand is poured off-rotation-axis in a cylindrical acrylic glass container, which is partially filled with water. Due to the centrifugal force at a certain angular velocity, water forms a truncated parabolic, which leaves the center part of the container base empty, and as the sand particles accumulate on the dry base, a cylindrical pile is formed with a parabolic pit at the top. The vertically growing cylindrical sand pile is more stable with small grains than with big sand particles. The mechanical stabilization of the cylindrical sand pile is achieved by the equilibration of the capillary forces and the resulting negative Laplace pressure of the soaked up water inside the pile. The essential features of the phenomenon are discussed and its robustness is demonstrated with experiments by varying the experimental boundary conditions and sand type.
机译：在本研究的范围内，我们报告了在绕垂直轴旋转的容器中形成圆柱形砂堆的情况。将稳定的干砂流偏离旋转轴地倒入部分装有水的圆柱形丙烯酸玻璃容器中。由于在一定角速度下的离心力，水形成了一个截顶的抛物线，使容器底部的中心部分空了，而随着沙子颗粒堆积在干燥的底部上，一个圆柱形的桩就形成了一个抛物面的凹坑。最佳。垂直生长的圆柱形砂桩，小颗粒比大颗粒更稳定。圆柱形砂桩的机械稳定性是通过平衡毛细作用力和在桩内吸收的水所产生的负拉普拉斯压力来实现的。讨论了该现象的基本特征，并通过改变实验边界条件和砂型，通过实验证明了其鲁棒性。

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