Drainage and Dewetting of Stratified Liquid Films

分层液膜的排水和去湿

• 批准号: 1435683
• 负责人: Gerald Fuller
• 金额: $ 30万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1435683&HistoricalAwards=false
• 关键词: Drainage; Dewetting; Stratified; Liquid; Films

PI: Fuller, Gerald G. Proposal Number: 1435683The goal of the proposed research is to explore the wetting and drainage of thin layers of liquid from curved surfaces. This largely experimental program will provide simultaneous measurements of the layer thicknesses of an upper, less dense liquid draining atop a second, more dense liquid that is also undergoing drainage. An example of such a system is an oil and water system that drains from a curved surface. An important event that occurring in the environment involving the drainage and dewetting of stratified liquid films is the interaction of oil slicks at the surface of water with aquatic life. It is important to understand this example since the coating of water-based plants, birds, mammals and fish is an unfortunate result of such spillage. In terms of education and outreach, the PI will develop and disseminate teaching modules that upgrade and complement existing core chemical engineering classes by covering new developments and challenges in fluid mechanics and interface science.The drainage and dewetting of stratified liquid layers from curved surfaces (e.g., hemispheres will be examined) is expected to be strongly affected by the viscosity ratio of the two liquids. It is expected that the drainage dynamics will undergo a number of transitions, depending on the viscosity ratio. For example, in the limit that the upper liquid becomes much more viscous, its drainage will transition from a Reynolds draining response where the thinning of the upper film decreases algebraically to an exponential decay. The experiments proposed are designed to measure the morphology of the resulting surface coverage patterns when drainage has proceeded to sufficiently long times. That is when dewetting of the curved substrate will ensue. The project will examine these processes as a function of the viscosity ratio of the two immiscible liquids and the surface energy of the substrate. In addition, the influence of interfacial viscoelasticity of the liquid/liquid interface will be examined.

PI：Fuller，Gerald G.提案编号：1435683拟议研究的目的是探索弯曲表面的液体液体薄层的润湿和排水。这个在很大程度上的实验程序将同时测量上一秒钟，更致密的液体上排出的上层，密度较低的液体的层厚度，这也正在流失。这样的系统的一个例子是从弯曲表面排出的石油和水系统。在环境中发生的一个重要事件涉及分层液体膜的排水和侵蚀，这是水面上的油滑动与水生寿命的相互作用。重要的是要理解这个例子，因为水基植物，鸟类，哺乳动物和鱼的涂层是这种溢出的不幸结果。在教育和外展方面，PI将通过涵盖流体力学和界面科学的新发展和挑战来开发和传播这些教学模块，从而升级和补充现有的核心化学工程类别。预计将检查半球）受两种液体的粘度比严重影响。预计排水动力学将经过许多过渡，具体取决于粘度比。例如，在上层液体变得更加粘性的极限中，其排水将从雷诺的排水响应过渡，其中上层膜的变薄会降低代数为指数衰减。提出的实验旨在测量排水足够长的时间时所产生的表面覆盖模式的形态。那就是弯曲底物的侵蚀的时候。该项目将研究这些过程是两个不混溶液体的粘度比和基板的表面能的函数。另外，将检查液体/液体界面的界面粘弹性的影响。