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arXiv 0705.2826cond-mat.soft
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振动U形管中的颗粒不稳定性

Granular instability in a vibrated U tube

I. Sánchez, J. R. Darias, R. Paredes, C. J. Lobb, G. Gutiérrez

摘要:

我们研究实验的集体运动的U形管内进行垂直振荡的颗粒,我们开发了一个非常简单的定量模型,捕捉所观察到的行为的相关功能。当系统以足够低的频率振动时,颗粒柱之间的高度差随时间而增长。该系统表现出两种类型的增长:指数发散(I型)和指数饱和(II型),这取决于晶粒的大小。I型生长可以通过去除空气来淬灭,而II型行为可以在不存在空气的情况下发生。模型与实验结果吻合较好。

英文摘要:

We study experimentally the collective motion of grains inside a U shaped tube undergoing vertical oscillations, and we develop a very simple quantitative model that captures relevant features of the observed behaviour. The height difference between the granular columns grows with time when the system is shaken at sufficiently low frequencies. The system exhibits two types of growth: exponentially divergent (type I) and exponentially saturating (type II), depending on the size of the grains. The type I growth can be quenched by removing the air whereas the type II behavior can occur in the absence of air. There is a good agreement between the model proposed and our experimental results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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