Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrohydrodynamic Quincke rotation of a prolate ellipsoid   We experimentally study the occurrence of spontaneous spinning (Quincke
rotation) of an ellipsoid in a uniform 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 Cebers et al. Phys. Rev .E 63:016301 (2000). We
also investigated the dynamics of the ellipsoidal Quincke rotor resting on a
planar surface with normal perpendicular to the field direction. We find novel
behaviors, such as swinging (long axis oscillating around the applied field
direction) and tumbling, due to the confinement.

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The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
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The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
1
The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
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The categories of this paper are: econ