长椭球的电流体动力学昆克旋转
Electrohydrodynamic Quincke rotation of a prolate ellipsoid
摘要：
实验研究了椭球体在均匀直流电场中的自发自旋现象。对于悬浮在无界流体中的椭球，我们发现两个稳定的状态，其特征在于椭球长轴相对于所施加的电场的方向：无自旋（平行）和自旋（垂直）。作为场强和纵横比的函数的椭球体行为的相图与Cebers等人的理论（Phys.Rev.E63：016301（2000））非常一致。我们还研究了椭圆形Quincke转子的动力学与垂直于磁场方向的正常的平面上休息。我们发现新的行为，如摆动（长轴振荡周围的施加的磁场方向）和翻滚，由于限制。
英文摘要：
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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