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Helical ribbons: Simple chiral sedimentation
Phys. Rev. Fluids 10, 024101 – Published 24 February, 2025
DOI: https://doi.org/10.1103/PhysRevFluids.10.024101
Abstract
We study the design of chiral particle shapes that couple translation to rotation in viscous fluid flow. We identify helical ribbons as particles with strong coupling whose symmetry ensures that the centers of mass, buoyancy, resistance, and mobility coincide. Cocentered particles such as helical ribbons provide an essential step in the hierarchy of increasingly complex translation-rotation coupling. Experiments on sedimenting helical ribbons measure both relevant mobility tensors and show excellent agreement with simulations of ribbons made of interacting spheres. We observe quasiperiodic angular dynamics causing complex spatial trajectories. In tilt-spin phase space, orbits are closed due to time-reversal and reflection symmetry. As the helical ribbon length increases, a bifurcation occurs at which the stable sedimentation orientations switch. The particle at the bifurcation has axisymmetric translation-rotation coupling and particularly simple sedimentation dynamics. Some special trajectories are unconfined in space and may contribute disproportionately to particle transport rates.
Physics Subject Headings (PhySH)
See Also
Sedimentation Dynamics of Bodies with Two Planes of Symmetry
Article Text
Supplemental Material
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