EAPSI: Pattern Formation on Liquid-Air Interfaces Due to Resonance

当堆叠的两流体系统在垂直于流体界面的方向上摇动时，流体界面上的图案将因共振而发展。这种现象被称为法拉第不稳定性。与日本宇宙航空研究开发机构(JAXA)松本聪博士合作的实验研究将使PI能够研究和验证通过使用电场在液-气界面上产生的图案的发展的理论计算。这种合作既提供了独特的实验仪器，也提供了世界级的研究人员。该设备此前曾被用于进行成功的初步试验。对界面图形产生的理解将导致许多工业相关过程的进步，包括半导体晶体生长、微流体混合增强和石油回收技术。静电参数强迫为多流体系统中法拉第不稳定性的产生提供了一种独特的方法。通过应用非线性动力学，研究人员将描绘出这种由静电振荡产生的不稳定性的潜在物理机制。在日本宇宙航空研究开发机构进行的实验将允许对通过严格处理粘度的线性稳定性分析获得的多流体和几何系统的稳定性阈值进行验证。这项研究将补充关于机械作用力法拉第不稳定性的传统研究，为表面作用力的物理学提供更多的见解。这些知识将转化为对界面对流、界面蒸发和相变(如凝固和电沉积)中发生的自感振荡的理解。控制地面强迫和整体强迫的尺度的分离将促进对其他不稳定现象的理解，在这些不稳定现象中，整体和地面力都参与其中。这项研究的直接应用包括微流控混合增强、更深入地了解液体晃动动力学，以及在使用水力压裂时提高石油采收率的潜力。该NSF EAPSI奖是与日本科学促进会(JSPS)合作资助的。

When a stacked two fluid system is shaken in a direction perpendicular to the fluid interface, patterns on the fluid interface will develop as a result of resonance. This phenomenon is known as Faraday instability. Experimental research in collaboration with Dr. Satoshi Matsumoto at the Japanese Aerospace Exploration Agency (JAXA) will allow the PI to study and validate theoretical calculations for the development of patterns generated on a liquid-air interface through the use of electric fields. This collaboration offers access to both a unique experimental apparatus and a world-class research staff. The apparatus has been used previously to perform successful preliminary trials. The understanding of interfacial pattern generation will lead to advancements in a multitude of industrially relevant processes, including semiconductor crystal growth, microfluidic mixing enhancement, and oil recovery techniques.Electrostatic parametric forcing offers a unique approach to the generation of Faraday instability within multi-fluid systems. Through the application of nonlinear dynamics, researchers will delineate the underlying physics of this instability when generated via electrostatic oscillations. Experiments conducted in JAXA will allow for the validation of the stability thresholds for systems of multiple fluids and geometries obtained through a linear stability analysis that rigorously treats viscosity. The research will complement traditional studies on mechanically forced Faraday instability, offering additional insight into the physics of surface forcing. This knowledge will translate into the understanding of self-induced oscillations that occur in interfacial convection, interfacial evaporation, and phase transformations such as solidification and electrodeposition. The separation of the scales that govern surface forcing and bulk forcing will advance the understanding of other instability phenomena where both bulk and surface forces participate. Direct applications of the research include microfluidic mixing enhancement, a deeper understanding of liquid sloshing dynamics, and the potential for enhanced oil recovery when using hydraulic fracturing. This NSF EAPSI award is funded in collaboration with the Japan Society for the Promotion of Science (JSPS).