Using Orthogonal Shear and Acoustic Excitation to Tune Thickening
and Jamming in Suspensions
Itai Cohen,
Cornell
University, Ithaca, USA
Abstract
Each year,
millions of viewers head to YouTube to watch people walk on water. Of course,
these people are not actually walking on water: as stress is applied to a
mixture of cornstarch and water, the cornstarch particles come close enough to
form force chains that are capable of supporting the weight of a person. While
these principles help create popular videos, they can be problematic when it
comes to efficient processing of industrial suspensions. In this talk I will
discuss how thickening problems can be overcome by oscillating the shearing or
impacting plate of a rheometer to eliminate shear and impact-driven jamming.
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