"Nonlinear Stability of Interfacial Fluids in Microchannels" Entwicklung von numerischen und asymptotischen Modellen zur Beschreibung des Stabilitätsverhaltens von Grenzflächenströmungen in Mikrokanälen unter dem Einfluss von elektrischen Feldern.

“微通道中界面流体的非线性稳定性”开发数值和渐近模型来描述电场影响下微通道中界面流动的稳定性行为。

• 批准号: 26314246
• 负责人: Dr. Stefan Mählmann
• 金额: --
• 依托单位: Department of Mathematical Sciences
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26314246?language=en
• 关键词: Nonlinear; Stability; Interfacial; Fluids; Microchannels

Liquid film flows occur in many applications of fluid mechanics including cooling systems, coating processes, combustion, and biological applications. The fundamental analysis of the stability and nonlinear states of such systems is of interest since the dynamics can enhance quantities such as heat and mass transfer rates. It is well known that electric fields can be used to control important physical aspects such as the properties of interfacial stability and the onset of singularities during rupture events. Although there have been numerous studies of the linear and nonlinear stability of interfacial flows in micro channels, research on the effects of electric fields acting on these flows is very rare. Recently, experiments at the NJIT have shown a nonlinear breakup mechanism in microchannel interfacial flow when an electric field acts on the fluids. Using finite electrodes, the flow can be controlled in a switching manner since the field produces instability. Detailed studies of the full problem have not been carried out so far. To improve understanding of the nonlinear stability of electrified microfluidic interfacial flows that cannot be addressed by asymptotic approaches, a full numerical simulation of the technically important electrified Poiseuille microchannel flow in a systematic way is proposed in this research. Special attention is devoted to interfacial stability, traveling wave formation, and droplet events.

液膜流动发生在流体力学的许多应用中，包括冷却系统、涂覆工艺、燃烧和生物应用。这种系统的稳定性和非线性状态的基本分析是感兴趣的，因为动态可以提高数量，如热量和质量传递速率。众所周知，电场可以用来控制重要的物理方面，如界面稳定性的属性和奇异性的发生在破裂事件。虽然已经有大量的研究，在微通道界面流动的线性和非线性稳定性，研究电场的影响，这些流动是非常罕见的。最近，在NJIT的实验表明，在微通道界面流的非线性破碎机制时，电场作用于流体。使用有限电极，可以以切换方式控制流动，因为场产生不稳定性。到目前为止，还没有对整个问题进行详细的研究。为了提高对带电微流体界面流的非线性稳定性的理解，不能通过渐近方法来解决，在这项研究中，提出了一个完整的数值模拟的技术上重要的带电Poietille微通道流系统的方式。特别注意的是致力于界面稳定性，行波形成，和液滴事件。