Reversing the Brazil-nut effect: Competition between percolation and condensation

被引：198

作者：

Breu, APJ ^{[1
]}

Ensner, HM ^{[1
]}

Kruelle, CA ^{[1
]}

Rehberg, I ^{[1
]}

机构：

[1] Univ Bayreuth, D-95440 Bayreuth, Germany

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.90.014302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on experiments on vertically shaken binary granular mixtures, which separate into their components due to the external excitation. This well-known phenomenon, where large particles rise to the top of the mixture, is called the Brazil-nut effect. Recent theoretical findings predict also a reverse Brazil-nut effect, where large particles sink to the bottom of the container. We choose spherical beads of various diameters and materials in order to observe the transition from Brazil-nut effect to its reverse form. The direction of demixing depends sensitively on the external excitation, so that it is possible to switch between both effects for a given mass density ratio.

引用

页数：3

共 16 条

[1]

Both JA, 2002, PHYS REV LETT, V88, DOI [10.1103/PhysRevLett.88.124301, 10.1103/PhysRevLEtt.88.124301]

[2] Does the reverse Brazil nut problem exist? -: art. no. 189601 [J].