Nonuniversal velocity fluctuations of sedimenting particles

被引：78
|
作者：
Tee, SY [1 ]
Mucha, PJ
Cipelletti, L
Manley, S
Brenner, MP
Segre, PN
Weitz, DA
机构：
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA
[3] Georgia Inst Technol, Sch Math, Atlanta, GA 30332 USA
来源：
PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 05期
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.89.054501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Velocity fluctuations in sedimentation are studied to investigate the origin of a hypothesized universal scale [P. N. Segre, E. Herbolzheimer, and P. M. Chaikin, Phys. Rev. Lett. 79, 2574 (1997)]. Our experiments show that fluctuations decay continuously in time for sufficiently thick cells, never reaching steady state. Simulations and scaling arguments suggest that the decay arises from increasing vertical stratification of particle concentration due to spreading of the sediment front. The results suggest that the velocity fluctuations in sedimentation depend sensitively on cell geometry.
引用
收藏
页码：054501/1 / 054501/4
页数：4
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