Instability modes of fluid interfaces under normal AC electric fields

正常交流电场下流体界面的不稳定模式

• 批准号: 422719952
• 负责人: Professor Dr. Steffen Hardt
• 金额: --
• 依托单位: Fachgebiet Nano- und Mikrofluidik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/422719952?language=en
• 关键词: Instability; modes; fluid; interfaces; under

Based on preliminary theoretical work, it is proposed to study the instability modes of fluid interfaces under application of a normal electric field. The term "fluid Interface" refers to an interface between two immiscible fluids, an electrolyte and a dielectric fluid. The dielectric fluid may either be a gas or a liquid. The main focus of the project will be on spatially homogeneous AC electric fields. The instability modes of the fluid interface will be studied in terms of their spatial structure and oscillation frequency. The threshold field strength needed to trigger the instability will be determined. After initial studies with clean fluid interfaces, the studies will be extended to interfaces covered with surfactants or particles. Specifically, it is expected that surfactant or particle-covered fluid interfaces exhibit instability modes that are qualitatively and quantitatively different from those of clean interfaces. Furthermore, it is planned to extend the existing theory in specific directions. The proposed work may have implications for the controlled generation of small droplets induced by electric fields and for the structuring of liquid films via self-organization.

在前期理论工作的基础上，提出了研究在法向电场作用下流体界面失稳模式的方法。术语“流体界面”是指两种不混溶流体（电解质和介电流体）之间的界面。介电流体可以是气体也可以是液体。该项目的主要重点将放在空间均匀的交流电场上。从空间结构和振动频率的角度研究了流体界面的失稳模式。触发不稳定所需的阈值场强将被确定。在对清洁流体界面进行初步研究后，研究将扩展到表面活性剂或颗粒覆盖的界面。具体来说，表面活性剂或颗粒覆盖的流体界面表现出与清洁界面在质量和数量上不同的不稳定性模式。此外，计划在特定的方向上扩展现有的理论。这项工作可能对电场诱导的小液滴的受控产生和通过自组织的液体膜的结构具有启示意义。