Fluidization of a two-dimensional granular system: Experimental study and scaling behavior.
Fluidization of a two-dimensional granular system: Experimental study and scaling behavior.
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DOI：
10.1103/physreve.52.5583
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发表时间：
1995-11
期刊：
影响因子：
--
通讯作者：
Warr;Huntley;Jacques
中科院分区：
文献类型：
--
作者：
Warr;Huntley;Jacques
采用数字高速摄影和计算机图像处理技术，研究了二维颗粒模型在垂直振动作用下的流化行为。的包装分数，速度和速度分布函数的配置文件进行测量。的包装分数被发现是近似均匀的在一个狭窄的区域在底部，和玻尔兹曼分布给出了一个很好的适合在上部区域。作为高度的函数，颗粒温度的值，提取的分布函数和近似线性衰减被发现。我们还提出了颗粒温度和质心高度的标度行为的结果。最后，我们描述了一个简单的理论分析，调查的起源标度律。
Digital high speed photography and computer image processing have been used to investigate the fluidization behavior of a two-dimensional model granular material undergoing vertical vibration. Profiles of packing fraction, speed, and velocity distribution functions are measured. The packing fraction is found to be approximately uniform in a narrow region at the base, and a Boltzmann distribution gives a good fit in the upper regions. Values for the granular temperature, as a function of height, are extracted from the distribution functions and an approximately linear decay is found. We also present results for the scaling behavior of the granular temperature and the height of the center of mass. Finally, we describe a simple theoretical analysis to investigate the origin of scaling laws.