Das Debasish, Lauga Eric
Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom.
Phys Rev Lett. 2019 May 17;122(19):194503. doi: 10.1103/PhysRevLett.122.194503.
Dielectric particles suspended in a weakly conducting fluid are known to spontaneously start rotating under the action of a sufficiently strong uniform dc electric field due to the Quincke rotation instability. This rotation can be converted into translation when the particles are placed near a surface providing useful model systems for active matter. Using a combination of numerical simulations and theoretical modeling, we demonstrate that it is possible to convert this spontaneous Quincke rotation into spontaneous translation in a plane perpendicular to the electric field in the absence of surfaces by relying on geometrical asymmetry instead.
已知悬浮在弱导电流体中的介电粒子由于昆克旋转不稳定性，在足够强的均匀直流电场作用下会自发开始旋转。当粒子放置在靠近表面的位置时，这种旋转可以转化为平移，从而为活性物质提供有用的模型系统。通过结合数值模拟和理论建模，我们证明，在没有表面的情况下，依靠几何不对称性，可以在垂直于电场的平面内将这种自发的昆克旋转转化为自发平移。
