Research Initiation Award - Experimental and Multiscale Simulation Study of Nanoscale Thermal Transport and Evaporation/Boiling Heat Transfer using Self-assembled Nanoemulsions

研究启动奖 - 使用自组装纳米乳液进行纳米级热传输和蒸发/沸腾传热的实验和多尺度模拟研究

• 批准号: 1601156
• 负责人: Jiajun Xu
• 金额: $ 29.99万
• 依托单位: University of the District of Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-05-01 至 2022-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1601156&HistoricalAwards=false
• 关键词: Research; Initiation; Award; Experimental; Multiscale

Research Initiation Awards provide support for junior and mid-career faculty at Historically Black Colleges and Universities who are building new research programs or redirecting and rebuilding existing research programs. It is expected that the award helps to further the faculty member's research capability and effectiveness, improves research and teaching at his home institution, and involves undergraduate students in research experiences. The award to the University of the District of Columbia (UDC) has potential broader impact in a number of areas. The goal of the project is to investigate multiscale thermal transport and energetics of phase change inside self-assembled nanoemulsions in a non-invasive way through characterization of thermophysical properties and structural dynamics at precisely controlled interfacial structure, surface chemistry and external fields. Undergraduate students will gain research experiences and high school students are involved in the project. The principal investigator also offers tutorials at conferences, conducts a research symposium and workshop on multiscale thermal transport at UDC, and invites collaborators to give talks to students and faculty. The work is expected to reveal the fundamentals of intermolecular thermal transport and interfacial thermodynamics inside self-assembled nanoemulsions. The following questions will be addressed: How can different surface effects such as wettability be separated from roughness on boiling heat transfer? Can the highly disordered nucleate boiling process including bubble dynamics be precisely controlled? and What are the mechanisms behind boiling in micro/nanosized confined space and how do they affect phase change heat transfer? The questions will be answered by obtaining high spatial- and temporal-resolution data of boiling heat transfer and bubble dynamics of the phase changeable self-assembled nanoemulsions on a customized heater via a synchronized high speed camera and infrared thermography. A simulation model that can predict the multiscale and multiphase thermal transport processes of colloidal fluids on micro/nanostructured surfaces will be developed. The knowledge obtained from this project will contribute to a better understanding of multiscale and multiphase thermal transport, provide critical technical and simulation solutions to enable rational design of advanced thermal management systems, and promote further development of next-generation communication, medical and energy technologies.

研究启动奖为传统黑人学院和大学的初级和中期职业教师提供支持，他们正在建立新的研究项目或重新指导和重建现有的研究项目。期望该奖项有助于进一步提高教师的研究能力和效率，改善其所在机构的研究和教学，并使本科生参与研究经验。授予哥伦比亚特区大学（UDC）的奖项可能在许多领域产生更广泛的影响。该项目的目标是通过在精确控制的界面结构、表面化学和外场下表征热物理性质和结构动力学，以非侵入的方式研究自组装纳米乳液内部相变的多尺度热传输和能量学。本科生将获得研究经验，高中生将参与该项目。首席研究员还在会议上提供教程，在UDC举办多尺度热输运研究研讨会和研讨会，并邀请合作者向学生和教师发表演讲。这项工作有望揭示自组装纳米乳液内部分子间热传递和界面热力学的基本原理。将解决以下问题：如何在沸腾传热中将不同的表面效应（如润湿性）与粗糙度分开？包括气泡动力学在内的高度无序的核沸腾过程能否被精确控制？微/纳米密闭空间沸腾的机制是什么？它们如何影响相变传热？通过同步高速相机和红外热像仪，在定制的加热器上获得相变自组装纳米乳液的沸腾传热和气泡动力学的高空间和时间分辨率数据，来回答这些问题。建立了一种能够预测微纳米结构表面胶体流体多尺度多相热输运过程的模拟模型。从该项目中获得的知识将有助于更好地理解多尺度和多相热传输，为合理设计先进的热管理系统提供关键的技术和仿真解决方案，并促进下一代通信、医疗和能源技术的进一步发展。