Segregation-driven organization in chaotic granular flows

被引：137

作者：

Hill, KM ^{[1
]}

Khakhar, DV ^{[1
]}

Gilchrist, JF ^{[1
]}

McCarthy, JJ ^{[1
]}

Ottino, JM ^{[1
]}

机构：

[1] Northwestern Univ, RR McCormick Sch Engn & Appl Sci, Evanston, IL 60208 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 1999年 / 96卷 / 21期

关键词：

D O I：

10.1073/pnas.96.21.11701

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

An important industrial problem that provides fascinating puzzles in pattern formation is the tendency for granular mixtures to de-mix or segregate. Small differences in either size or density lead to flow-induced segregation. Similar to fluids, noncohesive granular materials can display chaotic advection; when this happens chaos and segregation compete with each other, giving rise to a wealth of experimental outcomes. Segregated structures, obtained experimentally, display organization in the presence of disorder and are captured by a continuum flow model incorporating collisional diffusion and density-driven segregation. Under certain conditions, structures never settle into a steady shape. This may be the simplest experimental example of a system displaying competition between chaos and order.

引用

页码：11701 / 11706

页数：6

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