CAREER: Experimental and Numerical Study of Nanoscale Evaporation Heat Transfer for Passive-Flow Driven High-Heat Flux Devices

1454450 - MarooAbility在很短的时间内大量去除热量（即高热流密度）对于开发下一代热交换器，高速计算和可再生能源技术至关重要。本研究旨在利用纳米级液体薄膜在适当的液体供应下具有实现超高热去除率的潜力。实验和分子水平模拟都将用于获得对这种散热过程的基本理解。该项目的综合教育举措将使学生，包括那些来自工程学科中代表性不足的群体的学生，接触到多学科研究和纳米技术。外展包括与ULSAMP（上州路易斯斯托克斯少数民族参与联盟）合作，为少数民族本科生提供每年的研究机会，并为雪城学区的中学生提供每年的纳米技术研讨会，作为ULSAMP向代表性不足和多样化的学生群体外展的一部分。本研究的目的是利用分子模拟与池沸腾和蒸发实验的协同研究方法，研究与纳米半月板蒸发耦合被动液体流动以实现高热流密度去除相关的基础物理。在纳米半月板中，由于强大的毛细管和表面产生的分离力使半月板液体压力降低到绝对负值，从而产生被动液体流动。研究计划重点进行(1)水纳米半月板蒸发的分子动力学模拟，阐明其行为和特征；(2)水池沸腾实验与纳米级蒸发耦合，以提高临界热流密度；(3)纳米半月板蒸发实验，以实现水被动流动的高热流密度去除。知识方面的优点包括在分子动力学中实现和验证了一种新的“固-液传热模型”，以模拟水从加热表面蒸发，并制造了定义良好的新几何形状来实现纳米级半月板蒸发。该教育计划包括为工程学101的一年级本科生开发和实施一个为期三周的“纳米科学和纳米工程”模块。该模块将基于模型开发序列，以促进和发展对数学模型和工程概念的物理和视觉理解的需求，同时使用原子和分子的基本构建块。为了评估新手如何使用模拟模块探索物理现象，还将设计带有数据生成机制的作业来收集实时性能数据。

1454450 - MarooAbility to remove heat in large amounts and in a very short time (i.e., high heat fluxes) is critical for developing next-generation heat exchangers, high-speed computing, and renewable energy technologies. The proposed study is to take advantage that a thin liquid film at the nanoscale has the potential to achieve the ultra-high heat removal rate with proper liquid supply. Both experiments and molecular level simulations will be used to gain fundamental understanding of such heat removal processes. The integrated educational initiatives of this project will expose students, including those from underrepresented groups in engineering disciplines, to multidisciplinary research and nanotechnology. Outreach includes providing yearly research opportunity to a minority undergraduate student in collaboration with ULSAMP (Upstate Louis Stokes Alliance for Minority Participation), and yearly workshops on nanotechnology to middle-school students in Syracuse City School District as part of ULSAMP outreach to underrepresented and diverse student groups.The objective of the proposed research is to investigate the fundamental physics associated with nanoscale meniscus evaporation coupled with passive liquid flow for achieving high heat flux removal using a synergistic research methodology of molecular simulations with pool boiling and evaporation experiments. Passive liquid flow can be generated in a nanoscale meniscus due to the strong capillary and surface-generated disjoining forces which can lower the meniscus liquid pressure to absolute negative values. The research plan focuses on (1) performing molecular dynamics simulations of water nano-meniscus evaporation to elucidate its behavior and characteristics, (2) pool boiling experiments of water coupled with nanoscale evaporation to enhance the critical heat flux, and (3) experiments on nanoscale meniscus evaporation to achieve high heat flux removal with passive flow of water. The intellectual merits include implementation and validation of a novel "solid-to-liquid heat transfer model" in molecular dynamics to simulate evaporation of water from a heated surface, and fabrication of well-defined novel geometries to achieve nanoscale meniscus evaporation. The education plan includes development and implementation of a three-week module on "Nano-science and Nano-engineering" for first-year undergraduate students in Engineering 101. The module will be based on Model Development Sequences to promote and develop the need for physical and visual understanding of mathematical models and engineering concepts while using fundamental building blocks of atoms and molecules. To assess how novice students use simulation module to explore physical phenomena, assignments with a data-generating mechanism will also be designed to collect real-time performance data.