Cluster formation in a granular medium fluidized by vibrations in low gravity
Cluster formation in a granular medium fluidized by vibrations in low gravity
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DOI：
10.1103/physrevlett.83.440
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发表时间：
1999-07-12
影响因子：
8.6
通讯作者：
Beysens, D
中科院分区：
文献类型：
--
作者：
Falcon, É;Wunenburger, R;Beysens, D
我们报道了一项由非弹性碰撞粒子组成的“气体”的实验研究，该气体由低重力下的振动激发而成。在稀散粒介质的情况下，我们观察到一个空间均匀的气态区域，其压力的尺度与振动速度的3/2次方有关。随着介质密度的增加，空间均匀的流态化状态不再稳定，而是形成一个被低颗粒密度区包围的静止的致密团簇。
We report an experimental study of a "gas" of inelastically colliding particles, excited by vibrations in low gravity. Ln the case of a dilute granular medium, we observe a spatially homogeneous gaslike regime, the pressure of which scales like the 3/2 power of the vibration velocity. When the density of the medium is increased, the spatially homogeneous fluidized state is no longer stable but displays the formation of a motionless dense cluster surrounded by low particle density regions.