GOALI: Collaborative Research: Aerosol Droplets Migration in Fibrous Media

目标：合作研究：气溶胶液滴在纤维介质中的迁移

• 批准号: 1402655
• 负责人: Hooman Vahedi Tafreshi
• 金额: $ 22.96万
• 依托单位: Virginia Commonwealth 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 2020-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1402655&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Aerosol; Droplets

Vahedi Tafreshi, Hooman / Chase, George 1402655 / 1402336 Virginia Commonwealth University / University of Akron Efficient removal of finely dispersed droplets from gases or immiscible fluids is crucially important in a vast variety of applications such as diesel fuel purification to prevent corrosion and engine damage, pollution control for environmental protection and our health and safety, efficient water management in fuel cells, and even fog collection for water harvesting, among many others. Understanding the dynamics, coalescence, and migration of liquid droplets is the fundamental knowledge required for the proper design of liquid-liquid and liquid-gas separation fibrous media. As the physics of droplets coalescing on fibers of different wettability is highly complicated, the existing droplet separation media are generally manufactured through a series of inefficient and expensive trial-and-error processes. This proposal is a combined experimental-computational study to develop a generalized theory to describe the coalescence and movement of droplets on a fiber and between fibers, and thereby provide a more accurate method of designing liquid-liquid and liquid-gas separation media. The proposed research is a coupled multiscale-simulation-multiscale-experiment approach that 1) circumvents the need for excessive computational power, and 2) allows studying the physics of the problem at a fundamental level while producing an applied theory. Successful completion of this research will lead to the creation of enabling knowledge to design coalescing fibrous media based on engineering science, rather than trial-and-error. Educated design of droplet separation media can lead to significant savings in energy costs and the costs associated with pollution control. This work involves multiple students from K-12 through graduate. Students from underrepresented minorities will be recruited to participate in the proposed research program. Videos and images of droplet motions on fibers from experiments and models will be made available to the public for educational use. Educational materials will also be developed and incorporated into new graduate/undergraduate courses on multiphase transport in porous materials.

有效去除气体或非混相流体中分散的液滴在各种应用中至关重要，例如柴油净化以防止腐蚀和发动机损坏，环境保护和我们的健康和安全的污染控制，燃料电池中的有效水管理，甚至是收集水的雾收集。还有很多人。了解液滴的动力学、聚结和迁移是正确设计液-液和液-气分离纤维介质所需的基本知识。由于液滴在不同润湿性纤维上凝聚的物理过程非常复杂，现有的液滴分离介质一般是通过一系列低效且昂贵的试错工艺来制造的。本研究是一项实验与计算相结合的研究，旨在发展一种描述液滴在纤维上和纤维之间聚结和运动的广义理论，从而为设计液-液和液-气分离介质提供一种更精确的方法。提出的研究是一种耦合的多尺度模拟-多尺度实验方法，1)避免了对过度计算能力的需求，2)允许在产生应用理论的同时在基础水平上研究问题的物理。这项研究的成功完成将导致基于工程科学而不是试错法设计聚合纤维介质的知识的创造。有经验的液滴分离介质设计可以显著节省能源成本和与污染控制相关的成本。这项工作涉及从K-12到研究生的多名学生。来自代表性不足的少数民族的学生将被招募参加拟议的研究项目。实验和模型中液滴在纤维上运动的视频和图像将提供给公众用于教育用途。还将开发教育材料，并将其纳入关于多孔材料多相输运的研究生/本科生新课程。