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Rotational statistics in granular flows of smooth cylindrical particles

机译:光滑圆柱颗粒的颗粒流中的旋转统计

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We report the results of an experiment to investigate the energy dissipation in the rotational degree of freedom for smooth cylindrical particles in a driven granular flow. The 2D geometry and the experimental design allow for the measurement of three degrees of freedom in the dynamics: the rotational degree of freedom for the disks to spin about their cylindrical axes as well as the two translational degrees of freedom of the particles within the cell. The rotational velocity statistics demonstrate non-Gaussian behavior as well as a significant amount of energy being dissipated through the flow via the tangential friction between particles. These results are significant in that many driven granular experiments use smooth cylindrical or spherical particles to investigate granular dynamics, but the contribution to the dynamics from the rotational degrees of freedom is often unmeasured.
机译:我们报告了一个实验的结果,以研究在驱动的颗粒流中光滑圆柱颗粒的旋转自由度中的能量耗散。 2D几何形状和实验设计允许测量动力学中的三个自由度:圆盘绕其圆柱轴旋转的旋转自由度以及单元内粒子的两个平移自由度。旋转速度统计数据显示了非高斯行为,以及通过粒子之间的切向摩擦通过流耗散了大量能量。这些结果非常重要,因为许多驱动的颗粒实验都使用光滑的圆柱或球形颗粒来研究颗粒动力学,但是旋转自由度对动力学的贡献通常无法测量。

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