Collective motion of macroscopic spheres floating on capillary ripples: Dynamic heterogeneity and dynamic criticality

Céyda Sanli Cakir, Kuniyasu Saitoh, Stefan Luding, Devaraj Van Der Meer

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

When a densely packed monolayer of macroscopic spheres floats on chaotic capillary Faraday waves, a coexistence of large scale convective motion and caging dynamics typical for glassy systems is observed. We subtract the convective mean flow using a coarse graining (homogenization) method and reveal subdiffusion for the caging time scales followed by a diffusive regime at later times. We apply the methods developed to study dynamic heterogeneity and show that the typical time and length scales of the fluctuations due to rearrangements of observed particle groups significantly increase when the system approaches its largest experimentally accessible packing concentration. To connect the system to the dynamic criticality literature, we fit power laws to our results. The resultant critical exponents are consistent with those found in densely packed suspensions of colloids.

langue originaleAnglais
Numéro d'article033018
journalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume90
Numéro de publication3
Les DOIs
Etat de la publicationPublié - 30 sept. 2014

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