Segregation-driven organization in chaotic granular flows

K. M. Hill, D. V. Khakhar, J. F. Gilchrist, J. J. McCarthy, J. M. Ottino

Research output: Contribution to journalArticlepeer-review

147 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)11701-11706
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number21
StatePublished - Oct 12 1999


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