CAREER: Ferrohydrodynamic Pumping in Traveling Magnetic Fields: Theory and Fluidic Applications

提出了一种利用行磁场的闭环磁流体（铁磁流体）泵送方案。仅用外部磁场泵送铁磁流体，就为宏观、微观和纳米尺度上的广泛应用打开了大门，从而产生了可靠、可扩展、更简单、更便宜、更紧凑和节能的流体驱动概念。作为这项拟议工作的一部分，所获得的见解和经验将启发并导致对铁磁流体更广泛应用的研究，包括冷却、生物医学和制造业，无论是在PI的研究实验室还是在其他地方。智力优势：这项工作涉及一个多学科的研究项目，包括胶体化学、磁学和流体力学，将基础建模和分析与简单有效的测试方法相结合。该提案提供了在多个尺寸尺度上推进流体力学的物理理解，加上纳米尺度的磁性现象和磁化动力学。该研究将结合物理、数学和数值模拟以及宏观和微观尺度的实验。这种方法产生了可测试的理论预测，并发展了对铁流体动力学的基本理解，从而允许有效的设备设计，实现实际和有用的应用。更广泛的影响：这项研究的结果将为本科生和研究生的跨学科培训提供宝贵的机会，以及在耶鲁大学周围的大纽黑文地区开展推广活动的广阔前景。作为这个项目的一部分，其中一个研究工具涉及低成本的微流体装置，它自然地为本科生和研究生提供了一个基于设计的、动手操作的生物工程教学实验室。PI已经开发了一个教学模块，包括一个在线交互式教程软件，一个扩散模拟包，围绕微流体设备设计的廉价但功能强大的实验室组件，以及相关的实时分析软件。教学模块的目标是通过假设和基于测试的方法帮助学生理解微流体的关键概念。PI目前正在调整该模块，以供耶鲁大学和其他机构使用。本课程旨在确保工程教育的跨学科方法，无论是在研究生和本科水平。PI选择了康涅狄格工程预科项目（CPEP）作为他计划在纽黑文地区开展推广活动的主要合作伙伴，该地区有大量社会和经济上“处于危险”的儿童，以及传统上代表性不足的少数民族学生的高度集中。他已经自愿参加了他们的教师发展计划和课堂丰富活动。PI将与年轻学生分享铁磁流体的美丽和神奇的世界，带来演示套件（包括各种油基和水基铁磁流体，小型永磁体和详细介绍他们可以在课堂上进行的实验的视频）和使用铁磁流体拍摄的艺术图片和电影。他还准备在他的实验室举办开放日活动，邀请中学生参观，并邀请合格的少数民族高中生参加暑期实习项目。最后，PI自愿担任即将到来的纽黑文科学节的教员评委。

This proposal presents a closed-loop magnetic fluid (ferrofluid) pumping scheme using traveling magnetic fields. Pumping ferrofluids with external magnetic fields alone opens the door to a wide range of applications at the macro, micro and nano-scales, resulting in reliable, scalable, simpler, cheaper, compact and energy efficient fluid actuation concepts. The insights and experience gained as part of this proposed work will inspire and lead to investigations of a wider range of applications for ferrofluids, including cooling, biomedical and manufacturing industries, both within the PI's research laboratory and elsewhere.Intellectual Merits: The proposed work involves a multi-disciplinary research program that incorporates colloidal chemistry, magnetism and fluid mechanics, combining fundamental modeling and analysis with a simple and effective testing methodology. The proposal offers to advance the physical understanding of fluid mechanics at multiple size scales, coupled with nano-scale magnetic phenomena and magnetization dynamics. The study will integrate physical, mathematical and numerical modeling with both macro- and micro-scale experiments. This approach results in testable theoretical predictions and develops a fundamental understanding of ferrohydrodynamics that allows effective device designs, enabling practical and useful applications.Broader Impacts: The results of this study will provide valuable opportunities for the interdisciplinary training of both undergraduate and graduate students, as well as ample prospects for outreach activities in the greater New Haven area around Yale University. One of the research tools that will be used as part of this project involves low cost microfluidic devices which lend themselves naturally to the creation of a design-based, hands-on bioengineering teaching laboratory for both undergraduate and graduate students. A teaching module already being developed by the PI includes an online, interactive tutorial software, a diffusion simulation package, cheap yet powerful laboratory components designed around microfluidic devices, and associated real-time analysis software. The goal of the teaching module is to help students understand key concepts of microfluidics via a hypothesis and testing-based methodology. The PI is currently working on adapting the module for use at Yale University and other institutions. This coursework development is aimed at ensuring an interdisciplinary approach to Engineering education, both at the graduate and undergraduate levels.The PI has chosen the Connecticut Pre-Engineering Program (CPEP) as his main collaborator for his planned outreach activities around the New Haven area, which has a significant population of socially and economically "at-risk" children, as well as a high concentration of traditionally underrepresented minority students. He has already volunteered to participate in their teacher development program and classroom enrichment activities. The PI will share the beautiful and magical world of ferrofluids with young students, bringing in demonstration kits (comprised of various oil and water based ferrofluids, small permanent magnets and videos detailing experiments they can conduct in the classroom) and artistic pictures and movies taken using ferrofluids. He is also getting ready to host open-house days in his laboratory for visits by secondary school students, as well as invite qualified high school minority students for summer internship programs. Finally, the PI has volunteered to act as a faculty judge in the upcoming New Haven Science Festival.