Granular dynamics of a vibrated bed of dumbbells

Granular dynamics of a vibrated bed of dumbbells
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哑铃振动床的颗粒动力学

DOI:
10.1140/epjst/e2010-01189-y
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发表时间:
2010
期刊:
The European Physical Journal Special Topics
影响因子:
--
通讯作者:
Wildman R
Wildman R
中科院分区:
--
文献类型:
--
作者:
Wildman R

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采用实验和数值模拟相结合的方法对二维哑铃振动床进行了研究。在实验上,结合图像分析和跟踪软件的高速摄影被用于确定哑铃的组成颗粒的质心的位置和运动的位置和方向。在数值上,采用了与实验中使用的几何形状类似的几何形状,并使用离散单元法求解了每个粒子的运动方程。结果发现,尽管存在一些差异,数值模拟与实验结果相当吻合。随后,模拟方法被用来探索床的行为在一个范围内的密度。的速度分布的时刻被确定为高度的函数的范围内的数量的颗粒,它被发现,一个正常的速度分布是一个很好的近似值,除了接近振动的基础,有建议的速度的垂直分量的分布是一个复合的两组粒子,一个预碰撞的基础,和其他碰撞后。
A two-dimensional vibrated bed of dumbbells was investigated using experiment and numerical simulation. Experimentally, high speed photography in combination with image analysis and tracking software was used to determine the location of the centre of mass and the locations and direction of motion of the component particles of the dumbbells. Numerically, a geometry analogous to that used experimentally was employed and the equations of motion for each of the particles were solved using the distinct element method. It was found that, despite some differences, the numerical simulations agreed reasonably well with the experimental results. Subsequently, the simulation method was used to explore the behaviour of the bed over a range of densities. The moments of the velocity distributions were determined as a function of height for a range of numbers of particles, and it was found that a normal distribution of velocities is a good approximation, except close to the vibrating base where there were suggestions that the distribution of the vertical component of the velocities is a composite of two sets of particles, one pre-collision with the base, and the other post-collision.
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