无间隙液振动U型管内颗粒的模拟
Simulation of grains in a vibrated U-tube without interstitial fluid
摘要：
本文用分子动力学计算研究了二维U形管在垂直振动下一侧颗粒堆积的发展过程。研究了管道支管质心高度差的变化规律，发现管道支管在振动一段时间后，其质心高度差达到一个饱和值。我们得到，如果模拟开始时手臂水平或初始高度差较大，则该饱和值相同。探讨了管宽、颗粒密度、颗粒与管壁间的恢复系数对饱和度的影响。我们得到的饱和值达到最大值的管的宽度的值，并表明，运输的颗粒之间的武器是有利于低颗粒密度和高的颗粒壁恢复系数。
英文摘要：
We present a computational study using Molecular Dynamics of the development of an accumulation of grains in one side of a two dimensional U-tube under vertical vibrations. Studying the evolution of the height difference between the centers of mass of the branches of the tube, we found that it reaches a saturation value after vibrating for some time. We obtain that this saturation value is the same if the simulation start with the arms leveled or with a large initial height difference. We explore the effect of the width of the tube, the density of the grains and the coefficient of restitution between the grains and the wall on the value of the saturation. We obtain a value of the width of the tube for which the saturation value reaches a maximum, and show that the transport of grains between arms is favored for low grain densities and high grain-wall restitution coefficient.
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