Quincke rotor dynamics in confinement: rolling and hovering
Quincke rotor dynamics in confinement: rolling and hovering
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DOI：
10.1039/c9sm01163c
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发表时间：
2019-08-28
期刊：
影响因子：
3.4
通讯作者：
Vlahovska, Petia M.
中科院分区：
文献类型：
--
作者：
Pradillo, Gerardo E.;Karani, Hamid;Vlahovska, Petia M.
昆克效应是一种电流体动力学不稳定性，它在均匀直流电场中对电介质颗粒产生扭矩。先前的研究报道，一个球最初停留在电极滚动稳定的速度。我们的实验发现，在强磁场的滚动变得不稳定，与时间周期性的速度。此外，我们发现另一个政权，其中旋转球悬浮在电极之间的空间。我们的实验结果表明，昆克旋转的开始在很大程度上取决于粒子约束，并且与悬停状态下的旋转相比，滚动的阈值更高。
The Quincke effect is an electrohydrodynamic instability which gives rise to a torque on a dielectric particle in a uniform DC electric field. Previous studies reported that a sphere initially resting on the electrode rolls with steady velocity. We experimentally find that in strong fields the rolling becomes unsteady, with time-periodic velocity. Furthermore, we find another regime, where the rotating sphere levitates in the space between the electrodes. Our experimental results show that the onset of Quincke rotation strongly depends on particle confinement and the threshold for rolling is higher compared to rotation in the hovering state.