Tumbling of asymmetric microrods in a microchannel flow

We describe results of measurements of the orientational motion of glass microrods in a microchannel flow, following the orientational motion of particles with different shapes. We determine how the orientational dynamics depends on the shape of the particle and on its initial orientation. We find t...

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Bibliographic Details
Published inarXiv.org
Main Authors Einarsson, J, Mihiretie, B M, Laas, A, Ankardal, S, Angilella, J R, Hanstorp, D, Mehlig, B
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 18.12.2015
Subjects
Dependence
Microchannels
Particle shape
Physics - Fluid Dynamics
Physics - Soft Condensed Matter
Tumbling
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Summary:We describe results of measurements of the orientational motion of glass microrods in a microchannel flow, following the orientational motion of particles with different shapes. We determine how the orientational dynamics depends on the shape of the particle and on its initial orientation. We find that the dynamics depends so sensitively on the degree to which particle axisymmetry is broken that it is difficult to find particles that are sufficiently axisymmetric so that they exhibit periodic tumbling ("Jeffery orbits"). The results of our measurements confirm earlier theoretical analysis predicting sensitive dependence on particle shape and its initial orientation. Our results illustrate the different types of orientational dynamics for asymmetric particles predicted by theory.
ISSN:2331-8422
DOI:10.48550/arxiv.1503.03023