垂直电场下的法拉第波

Controlling the electrostatic Faraday instability using superposed electric fields

When the interface between a dielectric and a conducting liquid is excited by an oscillatory electric field, electrostatic Faraday waves can be induced. Here, we study the response of the interface to an AC electric field, which is superposed by either a second AC field of different frequency, or by a DC field. An algorithm based on light refraction at the fluidic interface is used to obtain the spatio-temporal response of the Faraday waves, and the critical voltage corresponding to onset of instability, the interfacial oscillation frequency and the dominant wavelengths are determined. The inf…

Electrokinetic instability in the sharp interface limit: The perpendicular electric field case

In this paper, instability at an interface between two miscible liquids with identical mechanical properties but different electrical conductivities is analyzed in the presence of an electric field that is perpendicular to the interface. A parallel electric field case was considered in a previous work [1]. A sharp Eulerian interface is considered between the two miscible liquids. Linear stability analysis leads to an analytic solution for the critical condition of instability. The mechanism of instability is analyzed. Key differences between the perpendicular and parallel electric field cases …

The spatial structure of electrostatically forced Faraday waves

The instability of the interface between a dielectric and a conducting liquid, excited by a spatially homogeneous interface-normal time-periodic electric field, is studied based on experiments and theory. Special attention is paid to the spatial structure of the excited Faraday waves. The dominant modes of the instability are extracted using high-speed imaging in combination with an algorithm evaluating light refraction at the liquid-liquid interface. The influence of the liquid viscosities on the critical voltage corresponding to the onset of instability and on the dominant wavelength is stud…

剪切诱导的垂直于电场的电泳迁移

Shear-Induced Electrophoretic Migration Perpendicular to the Electric Field

研究结合剪切流和电场下介电粒子的横向迁移，通过扩展浓度极化理论揭示剪切流打破离子浓度对称性导致迁移，并给出速度表达式，预测迁移方向反转。