Dynamic Heterogeneities in Complex Granular Flows Kuniyasu Saitoh , Ceyda Sanli , Devaraj van der Meer, and Stefan Luding University of Twente , Enschede , the Netherlands. Motivation.
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KuniyasuSaitoh, CeydaSanli, Devaraj van der Meer, and Stefan Luding
University of Twente, Enschede, the Netherlands
Dynamic heterogeneity (DH) is a phenomenological approach to the glass and jamming transitions, where the
characteristic time and length scales show remarkable critical behaviors like critical phenomena and we saw the universality
in many experiments of homogeneously driven granular systems. However, the driven granular systems are sometimes
accompanied by complex flows. Therefore, the criticality in complex granular flows is thetarget of ourstudy.
Polystyrene beads distributed on water
(mean diameter σ=0.62mm, polydisperse)
Standing wave generated by a shaker
Area fraction of the particles φ
Interaction between the particles
Capillary force -> “cohesive”
Trajectories projected on 2-dimensions
time = sec. length = σ
3-dimensional plots of the mobility & susceptibility
Trajectories of grains
Transport by convection
Coarse Graining (CG) method
Time & lengthscales
Mean square displacement