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

1454450 -Maroo能够在很短的时间内大量去除热量（即，高热通量）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。 这项研究的目的是利用纳米级的薄液膜在适当的液体供应下具有实现超高散热率的潜力。 实验和分子水平的模拟将被用来获得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，包括来自工程学科代表性不足群体的学生，接触多学科研究和纳米技术。 外联活动包括与ULSAMP合作，为少数民族本科生提供年度研究机会（Upstate Louis Stokes Alliance for Minority Participation）每年举办纳米技术讲习班，作为ULSAMP推广到代表性不足和多样化学生群体的一部分，锡拉丘兹市学区的学生。拟议研究的目标是调查与纳米级弯月面蒸发相关的基本物理再加上被动液体流动，以实现高的热通量去除使用协同研究方法的分子模拟池沸腾和蒸发实验。 被动液体流动可以在纳米级弯月面中产生，这是由于强的毛细力和表面产生的分离力，其可以将弯月面液体压力降低到绝对负值。 该研究计划的重点是（1）进行水纳米弯月面蒸发的分子动力学模拟，以阐明其行为和特性，（2）水与纳米蒸发耦合的池沸腾实验，以提高临界热通量，以及（3）纳米弯月面蒸发实验，以实现高的热通量去除与水的被动流动。 智力的优点包括实施和验证一种新的“固体到液体的传热模型”在分子动力学模拟水从加热表面的蒸发，以及制造定义明确的新的几何形状，以实现纳米级弯月面蒸发。 教育计划包括为工程101的一年级本科生开发和实施为期三周的“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模块。 为了评估初学者如何使用模拟模块来探索物理现象，还将设计具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.