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Graduate Student Seminar - 04/19/2013

"Suppression and Emergency of Granular Segregation"

by Matt Harrington

Friday, April 19, 2013 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Associate Professor Wolfgang Losert

Driven mixtures of granular materials have a general tendency to segregate by particle size, as seen in the stratification of avalanche deposits and the rising of large Brazil nuts in vibrated containers. To gain some insight into this phenomenon and indicate shortcomings of current models, we measure segregation of a shear-driven bidisperse mixture in a circular split-bottom geometry. We accomplish this using the Refractive Index Matched Scanning technique, which allows us to track the motion of nearly every individual grain in three dimensions. In this talk, I will discuss how bulk segregation can be suppressed for adequately small cyclic shear amplitude, while its emergence is accompanied by a threshold for particle-scale reversibility and distinct secondary flow profiles.

For additional information about the IREAP Graduate Student Seminars, contact David Meichle.

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