垂直振荡浅颗粒层的流态化

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摘要翻译：
用分子动力学模拟方法研究了垂直振动三维浅颗粒层的流态化。当容器加速度大于g时，颗粒温度和颗粒均方根位移增加，使层逐渐流化。对于接近弹性的颗粒，或振动频率低，或层深小的颗粒，流化过程的结束是以颗粒温度和均方根颗粒位移的突然增加为标志的。由于观察到诸如对流辊和表面波之类的宏观流体现象，因此该层被完全流化。增加总耗散（通过降低恢复系数或增加颗粒总数）可以降低颗粒温度和均方根颗粒位移的增加，并将增加的速度转移到更高的加速度上。增加频率也减少了跳跃的幅度，并将变化转移到更低的加速度。
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英文标题：
《Fluidization of a vertically oscillated shallow granular layer》
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作者：
Jennifer Kreft, Matthias Schroeter, Jack B. Swift, Harry L. Swinney
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Soft Condensed Matter        软凝聚态物质
分类描述：Membranes, polymers, liquid crystals, glasses, colloids, granular matter
膜，聚合物，液晶，玻璃，胶体，颗粒物质
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
  Molecular dynamics simulations are used to study fluidization of a vertically vibrated, three-dimensional shallow granular layer. As the container acceleration is increased above g, the granular temperature and root mean square particle displacement increase, gradually fluidizing the layer. For nearly elastic particles, or low shaking frequencies, or small layer depths, the end of the fluidization process is marked by an abrupt increase in the granular temperature and rms particle displacement. The layer is then fully fluidized since macroscopic, fluid-like phenomena such as convection rolls and surface waves are observed. Increasing the total dissipation (by either decreasing the restitution coefficient or increasing the total number of particles) decreases the increase in granular temperature and rms particle displacement at fluidization, and shifts the increase to higher accelerations. Increasing the frequency also decreases the magnitude of the jump, and shifts the change to lower accelerations.
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PDF链接：
https://arxiv.org/pdf/704.3852

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关键词：Displacement Acceleration Simulations frequencies coefficient 辊和 振动 layer granular temperature