Collaborative Research: Dynamics of Miscible Jets and Drops

合作研究：混相射流和液滴的动力学

• 批准号: 1335632
• 负责人: Gerald Fuller
• 金额: $ 22.35万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1335632&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamics; Miscible; Jets

1335632/1335666 PI: Fuller/ShenThe translation of miscible jets and drops, and the dissolution of drops are common events encountered in numerous technological processes. It is critical to understand the evolution of the transient interfacial tension, which has eluded measurement. These challenges motivated methods recently demonstrated by the PIs groups to extract very small and transient interfacial tensions existing between miscible liquids. This collaborative research aims to develop a series of complementary experiments to understand the fluid dynamics of miscible pairs of liquids, which can interact with one another through various formats: miscible jets, miscible suspended droplets, and miscible sessile drops. These experiments will be supplemented by numerical simulations in collaboration with Professor Anderson of Eindhoven Technical University. Each of these multiphase flow systems result in outcomes that are qualitatively different from those encountered by immiscible liquid pairs. The specific aims are: (1) studies of drop and jets translating through a second, miscible liquid; (2) suspended droplets of a miscible liquid experiencing stagnation point extensional flow in a microfluidic environment; (3) sessile drops of a miscible liquid spreading and dissolving within a matrix liquid; and (4) diffuse interface simulation of miscible pendant drops, jets and sessile drops. The results from the modeling will be compared against experimental determinations of the interfacial shapes in jets and drops.The dynamics of miscible liquid pairs has received little previous attention but are central to many physical processes. The combination of miscible materials can produce stable, intricate morphologies that are not possible with immiscible mixtures. Jets of miscible liquids can be used to great advantage in the scale-up production of highly oriented fibers that are otherwise difficult to process. The dissolution of miscible, sessile drops is a rich problem in multiphase flow that offers interesting analogies to desiccating drops along with the possibility of extracting measures of the interfacial tension between miscible liquids. The microfluidic approach to measuring interfacial tensions can be applied to other physical problems, such as systems undergoing chemical reactions, where the interfacial tension is changing with time. Similar approaches can also be adapted to incorporate different types of miscible fluids, drops, and biomolecules. The project will provide research training to graduate and undergraduate students. The results developed in this program will also make wonderful teaching tools for the introduction of fluid mechanics and interfacial phenomena to high school and undergraduate students.

1335632/1335666 PI：可混杂的喷气机和滴剂的翻译和滴落的溶解是众多技术过程中遇到的常见事件。了解瞬态界面张力的演变至关重要，这已经避免了测量。 PIS组最近证明了这些挑战的动机方法，以提取可模糊的液体之间存在的非常小而短暂的界面张力。这项协作研究旨在开发一系列互补的实验，以了解可混杂的液体对流体动力学，这些液体可以通过各种格式相互作用：可混杂的喷气机，可混杂的悬挂液滴和可混杂的缝隙滴。这些实验将通过数值模拟与Eindhoven技术大学的Anderson教授合作补充。这些多相流系统中的每一个都会产生与不混溶液体对遇到的结果在质上不同的结果。具体目的是：（1）通过第二秒，可混杂的液体翻译的滴和喷气机的研究； （2）在微流体环境中经历停滞点延伸点的可混杂液体的悬浮液滴； （3）可混杂的液体散布并溶解在基质液体中的无柄滴； （4）可混杂的吊坠滴，喷气机和无柄滴的扩散界面模拟。将建模的结果与喷气机和滴剂中界面形状的实验确定进行比较。可混杂的液体对的动力学几乎没有引起注意，但对许多物理过程是核心。可混杂的材料的结合可以产生稳定的，复杂的形态，而不可混合混合物是不可能的。可混杂的液体的喷射可用于极大的优势，以使原本难以加工的高度定向纤维的扩展产生。混乱，无柄滴的溶解是多相流中的一个丰富问题，它提供了有趣的类似物，以使滴剂的滴剂与可混杂液体之间的界面张力进行衡量的可能性。测量界面张力的微流体方法可以应用于其他物理问题，例如正在进行化学反应的系统，在界面张力随时间变化。类似的方法也可以适应以结合不同类型的可混杂的液体，滴和生物分子。该项目将为研究生和本科生提供研究培训。该计划中开发的结果还将为高中和本科生引入流体力学和界面现象，为引入流体力学和界面现象。