论文标题
在弯曲的几何形状中的浓度富集的电渗透性不稳定的水性电解质
Electro-osmotic Instability of Concentration Enrichment in Curved Geometries for an Aqueous Electrolyte
论文作者
论文摘要
我们报告说，与众所周知的浓度浓度富集的电渗透性不稳定是在弯曲的几何形状中，而不是在富集的界面（阳极）上启动，而不是在耗尽的界面（阳极）上启动。对于这种不稳定性，平面几何形状中不切实际的高材料小子数的局限是由线电荷奇异性引起的强电场消除的。在同心圆形电极的模型设置中，我们通过稳定性分析，数值模拟和实验可视化显示了不稳定性发生在内部阳极处，低于临界的曲率半径。稳定性标准还根据关键电场制定，并通过共形映射扩展到任意（2D）的几何形状。这一发现表明，通过使用针状电极触发这种不稳定性，可以在受盐富集（例如反渗透）限制的过程中增强运输。
We report that an electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte, as opposed to the well-known one, is initiated exclusively at the enriched interface (anode), rather than at the depleted one (cathode). For this instability, the limitation of unrealistically high material Peclet number in planar geometry is eliminated by the strong electric field arising from the line charge singularity. In a model setup of concentric circular electrodes, we show by stability analysis, numerical simulation, and experimental visualization that instability occurs at the inner anode, below a critical radius of curvature. The stability criterion is also formulated in terms of a critical electric field and extended to arbitrary (2d) geometries by conformal mapping. This discovery suggests that transport may be enhanced in processes limited by salt enrichment, such as reverse osmosis, by triggering this instability with needle-like electrodes.
