Effects of Local Interfacial and Flow Dynamics on Foam Drainage and Coarsening

局部界面和流动动力学对泡沫排水和粗化的影响

• 批准号: 0089162
• 负责人: Hsueh-Chia Chang
• 金额: $ 36万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-01-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0089162&HistoricalAwards=false
• 关键词: Effects; Local; Interfacial; Flow; Dynamics

This project will develop a realistic model, based on extensive experiments with 2-dimensional and 3-dimensional foams, to describe liquid foam coarsening and draining. Optimal industrial application of foam can only be achieved wen these two phenomena are properly understood. Current theories, developed for unrealistic motionless and/or ideal dry foams, omit the important interdependence of coarsening and drainage and local dynamic effects, like interfacial elasticity, viscous dissipation, surfactant transport, film rupture, bulk bubble motion/rearrangements, etc. The Magnetic Resonance Imaging (MRI) facility at the University of Notre Dame offers a non-invasive, high-resolution imaging technique for large (200 bubbles) domain of 3D foam. MRI will provide complete information about global changes in foam structure in experiments on drained/stabilized foam coarsening and wetting front propagation. Experiments on flowing 2D, bi-disperse foam and drainage from a single soap film will capture local film and vertex dynamics. Acquired data will be integrated into a dynamic foam model that will be used to correlate 3D coarsening and wetting front dynamics imaged by MRI. Graduate students involved in the project will receive training in physics and fluid mechanics and will get hands-on experience with MRI. Due to MRI's broad medical, scientific and engineering applicability, this training will prepare them for a range of careers in academia or industry.%%%Many technological processes, like secondary oil recovery, control of polluted ground water, industrial filtration, separation, etc. exploit foam stability and mechanical/transport properties which are strong functions of foam spatial patterns. As a result, optima industrial application can only be achieved when texture coarsening and drainage of liquid foams, which fundamentally changes their spatial patterns, are properly understood. Current theories, developed for unrealistic motionless and/or ideal dry foams, omit the interdependence of these phenomena. The aim of this project is to develop a realistic model, based on extensive experiments with 2-dimensional and 3-dimensional foams, that captures local film dynamic effects on global coarsening and drainage. The Magnetic Resonance Imaging (MRI) facility at the University of Notre Dame offers a non-invasive imagin technique sfor a large domain of 3D foams. Upon successful completion of the research project, the foam models will be disseminated to the scientific community and to the chemical/petroleum industry via the principal investigators websites and through a workshop/conference at the University of Notre Dame. Graduate students involved in the project will receive training in physics and fluid mechanics and will get hands-on experience with MRI. Due to MRI's broad medical, scientific and engineering applicability, this training will prepare them for a range of careers in academia or industry.

本计画将发展一个真实的模型，以二维和三维泡沫的大量实验为基础，来描述液体泡沫的粗化和排水。 只有正确理解这两种现象，才能实现泡沫的最佳工业应用。 目前的理论，为不切实际的静止和/或理想的干泡沫开发，忽略了粗化和排水以及局部动态效应的重要相互依赖性，如界面弹性，粘性耗散，表面活性剂运输，膜破裂，大量气泡运动/重排等。圣母大学的磁共振成像（MRI）设施提供了一种非侵入性，用于3D泡沫的大（200个气泡）域的高分辨率成像技术。 MRI将提供有关排水/稳定泡沫粗化和润湿前沿传播实验中泡沫结构全球变化的完整信息。 流动的2D，双分散泡沫和排水从一个单一的肥皂膜的实验将捕捉当地的电影和顶点动态。 获取的数据将被集成到动态泡沫模型中，该模型将用于关联MRI成像的3D粗化和湿润锋动态。 参与该项目的研究生将接受物理学和流体力学的培训，并将获得MRI的实践经验。 由于MRI具有广泛的医学、科学和工程应用性，该培训将为他们在学术界或工业界的一系列职业生涯做好准备。许多技术过程，如二次采油、受污染地下水的控制、工业过滤、分离等，都利用泡沫稳定性和机械/运输性能，这些都是泡沫空间模式的强大功能。 因此，最佳的工业应用，只有当纹理粗化和排水的液体泡沫，从根本上改变他们的空间格局，得到正确的理解，才能实现。 目前的理论，不切实际的静止和/或理想的干泡沫，忽略了这些现象的相互依赖性。 该项目的目的是开发一个现实的模型，广泛的实验与2维和3维泡沫的基础上，捕捉局部膜的动态效应对全球粗化和排水。 圣母大学的磁共振成像（MRI）设备为大范围的3D泡沫提供了一种非侵入性成像技术。 研究项目成功完成后，将通过主要研究人员的网站和圣母大学的讲习班/会议向科学界和化学/石油工业传播泡沫模型。 参与该项目的研究生将接受物理学和流体力学的培训，并将获得MRI的实践经验。 由于MRI广泛的医学，科学和工程应用性，这种培训将为他们在学术界或工业界的一系列职业生涯做好准备。