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Electrohydrodynamic Quincke rotation of a prolate ellipsoid

Quentin Brosseau, Gregory Hickey, and Petia M. Vlahovska

  • School of Engineering, Brown University, Providence, Rhode Island 02912, USA

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Phys. Rev. Fluids 2, 014101 – Published 17 January, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.014101

Abstract

We study experimentally the occurrence of spontaneous spinning (Quincke rotation) of an ellipsoid in a uniform direct current (dc) electric field. For an ellipsoid suspended in an unbounded fluid, we find two stable states characterized by the orientation of the ellipsoid long axis relative to the applied electric field: spinless (parallel) and spinning (perpendicular). The phase diagram of ellipsoid behavior as a function of field strength and aspect ratio is in close agreement with the theory of Cēbers et al. [Phys. Rev. E 63, 016301 (2000)]. We also investigate the dynamics of the ellipsoidal Quincke rotor resting on a planar surface with normal perpendicular to the field direction. We find behaviors, such as swinging (long axis oscillating around the applied field direction) and tumbling, due to the confinement.

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Phys. Rev. Fluids 2, 014101– Published 17 January, 2017
  • Received 6 September 2016
Article part of CHORUS

©2017 American Physical Society

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