Granular convection and the Brazil nut effect in reduced gravity.
Granular convection and the Brazil nut effect in reduced gravity.
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粒状对流和巴西坚果的重力降低效应。
DOI：
10.1103/physreve.87.044201
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J. Blum
中科院分区：
文献类型：
--
作者：
C. Güttler;Ingo von Borstel;R. Schräpler;J. Blum
我们目前的实验室实验的垂直振动的颗粒介质组成的1毫米直径的玻璃珠嵌入8毫米直径的入侵者玻璃珠。这些实验是在实验室中进行的，也是在减轻重力条件下（火星和月球重力水平）进行的抛物线飞行。我们测量了大玻璃珠的平均上升速度，并提出其依赖于样品容器的填充高度，激发加速度和环境重力水平。我们发现，上升速度的规模在所有三个重力制度以相同的方式，并大致与重力成线性关系。
We present laboratory experiments of a vertically vibrated granular medium consisting of 1-mm-diameter glass beads with embedded 8-mm-diameter intruder glass beads. The experiments were performed in the laboratory as well as in a parabolic flight under reduced-gravity conditions (on Martian and Lunar gravity levels). We measured the mean rise velocity of the large glass beads and present its dependence on the fill height of the sample containers, the excitation acceleration, and the ambient gravity level. We find that the rise velocity scales in the same manner for all three gravity regimes and roughly linearly with gravity.