CYCLIC SEGREGATION STATE IN VERTICALLY VIBRATED BINARY GRANULAR MIXTURES

被引：0

作者：

Shi, Qingfan ^{[1
]}

Pan, Beicheng ^{[1
]}

Lu, Changhong ^{[1
]}

Sun, Gang ^{[2
,3
]}

机构：

[1] Beijing Inst Technol, Dept Phys, Beijing 100081, Peoples R China

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Key Lab Soft Matter Phys, Beijing 100190, Peoples R China

来源：

MODERN PHYSICS LETTERS B | 2014年 / 28卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Granular matter; segregation; periodic variation; WAVE-PROPAGATION; STABILITY;

D O I：

10.1142/S0217984914500201

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper, the vertically vibrated binary granular mixtures at atmospheric pressure are studied experimentally. We find a nonstationary segregation state, of which the structure changes with time cyclically. The period of the cyclic segregation is measured and its variation with the vibration conditions is shown. The transition between the segregation states is also discussed, and a phase diagram on the plot of frequency against acceleration amplitude is given. In order to observe the effect of air flow in the segregation process, an alternative container with ventilated bottom is designed. Our experiments show that both regions of the Brazil nut segregation state and the cyclic segregation state shrink obviously by use of the latter container and disappear completely if the whole system is placed in vacuum. These results testify that the air pressure plays a positive role in both the Brazil nut effect and cyclic segregation.

引用

页数：18

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