"Jamming, Jetting, and Flow: Complexity in the Flow of Granular-Fluid Systems"

Tuesday, March 20, 2018
4:30 PM - 6:00 PM (ET)
Event Type
Distinguished Visitors Program

Distinguished Visitor Brian Utter, associate professor, Bucknell University

The interactions between individual particles in a granular material are relatively simple, largely determined by friction, collisions, and normal forces. Yet, describing macroscopic flow is surprisingly challenging because unexpected properties emerge from the interaction of many nonlinear building blocks in these complex systems. These complications continue to pose challenges in applications ranging from avalanching and soil mechanics to industrial mixing and transport. I will present results from laboratory experiments on granular and multiphase (grain-fluid) systems in which we aim to better understand their flow, including jamming of vibrated grains under shear, jets of suspensions of hydrophobic grains in which surface chemistry is important, and clogging of particles in bidirectional flow. In these systems, we find that flow is primarily determined by the geometry and confinement imposed in the experiment and that one can alter flow substantially by specifically altering these boundary effects.

Tea at 4:15 p.m.

Sponsored by the Department of Physics in conjunction with the Distinguished Visitors Program 

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