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Condensed Matter > Soft Condensed Matter
Title: Striped Patterns in Radially Driven Suspensions with Open Boundaries
(Submitted on 14 Jul 2021 (v1), last revised 30 Oct 2021 (this version, v2))
Abstract: We study the motion of radially driven fluid-immersed particles in a novel Hele-Shaw cell with open boundaries. The initially uniform suspension forms a striped pattern within a specific range of horizontal oscillation frequencies and for sufficiently large amplitudes. We observe that the initial coarsening dynamics of the stripes gradually slows down and the pattern reaches a steady state after a few minutes. The distance between the stripes in the steady state exhibits an exponentially saturating increase with increased oscillation amplitude or frequency. The width of the stripes decreases as a power-law with the frequency while its amplitude dependence follows a logistic function. We propose a mechanism -- based on the interplay between shear stress, hydrodynamic interactions, and frictional forces -- to link the structural characteristics of the stripes to the properties of the oscillatory external drive.
Submission history
From: M. Reza Shaebani [view email][v1] Wed, 14 Jul 2021 19:41:37 GMT (22182kb)
[v2] Sat, 30 Oct 2021 11:35:11 GMT (33318kb)
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