Phys. Rev. Lett. 99, 148001 (2007) [4 pages]Eliminating Segregation in Free-Surface Flows of ParticlesReceived 21 February 2007; revised 13 July 2007; published 4 October 2007 By introducing periodic flow inversions, we show both experimentally and computationally that forcing with a value above a critical frequency can effectively eliminate both density and size segregation. The critical frequency is related to the inverse of the characteristic time of segregation and is shown to scale with the shear rate of the particle flow. This observation could lead to new designs for a vast array of particle processing applications and suggests a new way for researchers to think about segregation problems. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.148001
DOI:
10.1103/PhysRevLett.99.148001
PACS:
45.70.Mg
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