Collaborative Research: Sloshing liquid decontamination of compliant surfaces

偏远表面的去污具有挑战性，特别是当外部物质的积累阻碍这些表面的动态功能时。这种表面的一个例子是扑翼机器人上的小而灵活的翅膀，它们开始接近自然昆虫的规模。使用振动从这些表面去除液体污染物提供了自主清洁和干燥的机会。然而，在这些尺度下，晃动的液体污染物的运动和它们所停留的柔性表面是耦合的-一个的变形影响另一个。因此，这个项目的主要目的是提供一个深入的了解如何运动的表面影响的运动和喷射的液滴。该项目将提供一个基础，使自净化策略适用于易受液滴影响的其他表面，例如食品制备和医疗保健中的表面。该项目还包括通过科学展览项目指导和PI实验室的研究机会向当地高中学生开展外联活动。这个项目的目的是揭示物理的晃动液体污染物和喷射从表面的流体和表面运动是高度耦合的。这种紧密结合的实验，理论和数值研究将回答高度相互依赖的流体-结构相互作用的问题。该项目将两个基本系统-悬臂梁和液滴-组合成一个动态复杂系统。 驱动悬臂基座使其弯曲，并且使液滴晃动和/或滑动，并且基板又动态地响应液滴运动。高速摄像和精确控制的振动输入将能够表征液滴运动和喷射事件，其中固体基底可以在整个振动周期中表现出一定范围的曲率和加速度。传统的悬臂梁和弹性动力学将增加与惯性相关的非保守流体力，以量化耗散，滴的连贯性，和流体在这些非稳态过程中的去除。数值将允许耦合流体和固体控制方程的合成，以确定最有效的激励策略，基板去污。自我净化的能力为柔性机翼提供的多功能性增加了一个新的维度，对于易受化学品、水分和生物膜影响的表面的功能性至关重要。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The decontamination of remote surfaces is challenging, particularly when the accumulation of external matter hinders these surfaces’ dynamic function. An example of such surfaces is the small, flexible wings on flapping-wing robots that are beginning to approach the scale of natural insects. Removing liquid contaminants from these surfaces using vibration presents an opportunity for autonomous cleaning and drying. However, at these scales, the motion of the sloshing liquid contaminants and the flexible surfaces on which they rest are coupled—the deformation of one influences the other. Therefore, the principal aim of this project is to provide a deep understanding of how the motion of a surface impacts the motion and ejection of a liquid drop. This project will provide a foundation by which to adapt self-decontamination strategies to other surfaces vulnerable to droplets, such as those in food preparation and healthcare. This project also encompasses outreach activities to local high school students via science fair project mentoring and research opportunities in the PIs’ labs. The objective of this project is to reveal the physics of sloshing liquid contaminates and ejection from surfaces in which the fluid and surface motions are highly coupled. This tightly integrated experimental, theoretical, and numerical study will answer questions in highly interdependent fluid-structure interaction. This project mates two elementary systems—a cantilever and a fluid drop – to form a dynamically complex system. Driving the cantilever base causes it to bend and the drop to slosh and/or slide, and the substrate dynamically responds in turn to drop motion. High-speed videography and precisely controlled vibratory input will enable the characterization of drop motion and ejection events in which the solid substrate can exhibit a range of curvatures and accelerations throughout the vibration cycle. Conventional cantilever and elastica dynamics will be augmented with inertia-related non-conservative fluid forces to quantify dissipation, drop coherence, and fluid removal in these non-stationary processes. Numerics will permit the synthesis of coupled fluid- and solid-governing equations to determine the most effective excitation strategy for substrate decontamination. The ability to self-decontaminate adds a new dimension to the multi-functionality provided by flexible wings and will be critical to the functionality of surfaces vulnerable to chemicals, moisture, and biofilms.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.