剪切电对流中的局域态
Localized states in sheared electroconvection
摘要：
电对流在一个薄的，剪切流体膜显示了丰富的序列之间的分叉不同的流动状态作为驱动电压的增加。我们提出了一个数值研究的环形薄膜中，径向电势差作用于感应表面电荷驱动对流。膜也通过独立地旋转环的内边缘而被剪切。这个模拟模型的剪切近晶相液晶薄膜的电对流实验室实验。所施加的剪切力与电力竞争，导致振荡和强烈的亚临界分岔之间的本地化涡状态接近发病。在较高的强迫下，流动通过Ruelle-Takens-Newhouse情景变得混乱。该模拟允许流动可视化不可用的物理实验中，并揭示了以前观察到的电对流近晶薄膜的电流-电压特性的转变。
英文摘要：
Electroconvection in a thin, sheared fluid film displays a rich sequence of bifurcations between different flow states as the driving voltage is increased. We present a numerical study of an annular film in which a radial potential difference acts on induced surface charges to drive convection. The film is also sheared by independently rotating the inner edge of the annulus. This simulation models laboratory experiments on electroconvection in sheared smectic liquid crystal films. The applied shear competes with the electrical forces, resulting in oscillatory and strongly subcritical bifurcations between localized vortex states close to onset. At higher forcing, the flow becomes chaotic via a Ruelle-Takens-Newhouse scenario. The simulation allows flow visualization not available in the physical experiments, and sheds light on previously observed transitions in the current-voltage characteristics of electroconvecting smectic films.
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