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Spinning and tumbling of micron-sized triangles in a micro-channel shear flow

Journal article
Authors Johan Fries
M. V. Kumar
B.M. Mihiretie
Dag Hanstorp
Bernhard Mehlig
Published in Physics of Fluids
Volume 30
Issue 3
ISSN 1070-6631
Publication year 2018
Published at Department of Physics (GU)
Language en
Links https://doi.org/10.1063/1.5020383
Keywords Fluids, Physics, Doubly periodic, Measurements of, Simple shear, Spinning frequency, Shear flow
Subject categories Physical Sciences

Abstract

We report on measurements of the angular dynamics of micron-sized equilaterally triangular platelets suspended in a micro-channel shear flow. Our measurements confirm that such particles spin and tumble like a spheroid in a simple shear. Since the triangle has corners, we can observe the spinning directly. In general, the spinning frequency is different from the tumbling frequency and the spinning is affected by tumbling. This gives rise to doubly periodic angular dynamics. © 2018 Author(s).

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