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The Dynamics of Curved Fluid Films Between Complex Interfaces

复杂界面之间弯曲流体膜的动力学

基本信息

批准号：
1952635
负责人：
Eric Stefan Shaqfeh
金额：
$ 34.5万
依托单位：
Stanford University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-04-01 至 2025-03-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1952635&HistoricalAwards=false
关键词：
Dynamics Curved Fluid Films Between

项目摘要

The dynamics of thin films are critical to the coalescence of drops, foam stability, the action of lubricants of all types, as well as, “drying’’ phenomena of all kinds, including the levelling of paints and coatings. In our bodies, thin fluid films play a key role in a wide array of processes including the cleaning of the air after inhalation, the ability to see clearly under all kinds of conditions through the so-called “tear film”, and the ability of single red blood cells to transfer oxygen in capillaries. It is now known and has been demonstrated repeatedly in experiments over the last decade that very small inhomogeneities in the films (i.e. impurities), generate film thickness patterns that can be time dependent and chaotic. These dynamics can even lead to a new kind of “turbulence”. There is very little physical understanding of the formation of these complex patterns, which, once they appear, completely control the lifetime and evolution of the thin films. So, for example, they determine whether a foam is stable or unstable or whether a lubricant fails or remains useful. The research integrates theory, numerical simulations, and experiments to develop a physical understanding of these complex dynamics and the conditions in which they may occur. The knowledge learned during the research will be disseminated in two classes at Stanford, three high school teachers will be involved in the research with summer internships, and the Stanford STAR – Scientific Teaching Through Art – program will highlight the natural beauty of the dynamics of these films and visually develop appealing stories to reach a broad audience including high school and community college students.To accomplish the understanding of these thin film chaotic dynamics the research will employ direct numerical simulation (DNS) via a lubrication or “thin film” theory– thus even with the “thin film” assumption a large numerical solution is required. The research will elucidate via numerical simulation over parameter regimes associated with previously accomplished experiments, what are the conditions and mechanisms for the formation of these patterns. The simulations will be coupled with additional experiments to directly test whether a new physical understanding has been successfully modelled. The research goal is to delineate the parameter regimes where prior simplifying assumptions regarding space and time development are not valid, thus fundamentally changing the study of thin film dynamics between complex interfaces.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.

薄膜的动力学对于液滴的聚结、泡沫稳定性、所有类型的润滑剂的作用以及所有类型的“干燥”现象（包括油漆和涂料的流平）都是至关重要的。在我们的身体中，薄的流体膜在一系列过程中发挥着关键作用，包括吸入后空气的清洁，通过所谓的“泪膜”在各种条件下清楚地看到的能力，以及单个红细胞在毛细血管中传输氧气的能力。现在已知并且已经在过去十年的实验中反复证明，膜中非常小的不均匀性（即杂质）产生可以是时间依赖的和混乱的膜厚度图案。这些动态甚至可能导致一种新的“动荡”。对这些复杂图案的形成几乎没有物理上的理解，一旦它们出现，就完全控制了薄膜的寿命和演变。因此，例如，它们确定泡沫是稳定还是不稳定，或者润滑剂是否失效或仍然有用。该研究整合了理论，数值模拟和实验，以发展对这些复杂动力学及其可能发生的条件的物理理解。在研究过程中学到的知识将在斯坦福大学的两个班级中传播，三名高中教师将通过暑期实习参与研究，和斯坦福大学的星星-通过艺术进行科学教学-该计划将突出这些电影的动态自然之美，并在视觉上发展吸引人的故事，以达到包括高中和社区大学学生在内的广泛观众。这些薄膜混沌动力学的研究将采用直接数值模拟（DNS）通过润滑或“薄膜”理论-因此，即使与“薄膜”的假设，一个大的数值解是必需的。这项研究将通过数值模拟阐明与先前完成的实验相关的参数制度，这些模式形成的条件和机制是什么。模拟将与其他实验相结合，以直接测试新的物理理解是否已成功建模。该研究的目标是划定参数制度，事先简化的假设，关于空间和时间的发展是无效的，从而从根本上改变了复杂的接口之间的薄膜动力学的研究。这个奖项反映了NSF的法定使命，并已被认为是值得通过评估使用基金会的智力价值和更广泛的影响审查标准的支持。