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Preferential sampling of helicity by isotropic helicoids
Phys. Rev. Fluids 1, 054201 – Published 12 September, 2016
DOI: https://doi.org/10.1103/PhysRevFluids.1.054201
Abstract
We present a theoretical and numerical study on the motion of isotropic helicoids in complex flows. These are particles whose motion is invariant under rotations but not under mirror reflections of the particle. This is the simplest, yet unexplored, extension of the much studied case of small spherical particles. We show that heavy isotropic helicoids, due to the coupling between translational and rotational degrees of freedom, preferentially sample different helical regions in laminar or chaotic advecting flows. This opens the way to control and engineer particles able to track complex flow structures with potential applications to microfluidics and turbulence.
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