Segregation-driven organization in chaotic granular flows

Hill, K. M. ; Khakhar, D. V. ; Gilchrist, J. F. ; McCarthy, J. J. ; Ottino, J. M. (1999) Segregation-driven organization in chaotic granular flows Proceedings of the National Academy of Sciences of the United States of America, 96 (21). pp. 11701-11706. ISSN 0027-8424

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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.

Item Type:Article
Source:Copyright of this article belongs to National Academy of Sciences, USA.
ID Code:17412
Deposited On:16 Nov 2010 08:35
Last Modified:17 May 2016 02:03

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