The Structure and Dynamics of Thin Film Liquid-Vapor Systems in Microgeometries

微观几何中薄膜液-汽系统的结构和动力学

• 批准号: 0854148
• 负责人: Kenneth Breuer
• 金额: $ 30.05万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0854148&HistoricalAwards=false
• 关键词: Structure; Dynamics; Thin; Film; Liquid

CBET-0854148Breuer A three year program will be conducted to study the structure and dynamics of evaporation in micron-scale systems. We plan to explore the manner in which liquid-vapor systems behave in confined geometries with typical scales of 0.1 - 20 microns where the role of the transitional zone between the bulk meniscus and the adsorbed liquid film becomes dominant. Of particular interest will be the description of the role of the thin liquid transition film that leads the bulk liquid phase and has been demonstrated to contribute significantly to the overall heat and mass transfer in small systems. The effects of fluid and surface chemistry, geometry, and the presence of fluid additives will be systematically explored. Novel experimental techniques will be used to measure velocities and temperatures in the 200 nm near the liquid-solid interface, as well as to directly measure the thickness of the thin liquid film on the solid substrate as it evolves. Measurements of fluid velocities and evaporation rates will be taken and compared with theoretical and numerical predictions for similar systems.Intellectual Merit: The behavior of two-phase systems in microgeometries, and in particular, the character of the thin liquid film on a smooth surface continues to be a problem of critical importance and one in which there is active debate in the heat transfer and fluid mechanics literature. As microengineering continues to push towards smaller scales, the characterization and modeling of the physics of these thermal transport problems becomes more relevant and challenging. High-quality experimental data are critical in providing guidance to models and numerical experiments in this field. Broader Impacts: The results obtained during this research will help guide design and analysis for a wealth of micron-scale heat transfer systems (heat pipes, capillary pumped loops, etc.) that can be used in a multitude of applications such as chip cooling, thermal control in micro-systems, space power applications, etc. The project will support the training of one graduate student to work closely with the PI. The project will also involve an undergraduate student. We will also continue to build on our successful history of recruiting under-represented groups (through the Leadership Alliance), and will leverage and participate with the Brown University MRSEC outreach program, for example by working with the K-12 Teacher Training Program and high school student Research Experience Program. Lastly, we will continue to work with media producers (such as NOVA and Discovery Channel) in the development of science programming for a wide audience.

CBET-0854148 Breuer将进行一个为期三年的计划，以研究微米尺度系统中蒸发的结构和动力学。我们计划探索的方式，其中液体-蒸汽系统的行为在有限的几何形状与典型的尺度为0.1 - 20微米的散装弯月面和吸附的液体膜之间的过渡区的作用成为主导。特别感兴趣的将是薄的液体过渡膜的作用，导致散装液相的描述，并已被证明有助于显着的整体传热和传质在小系统中。将系统地探讨流体和表面化学，几何形状和流体添加剂的存在的影响。新的实验技术将用于测量液-固界面附近200 nm处的速度和温度，以及直接测量固体基底上薄液膜的厚度。流体速度和蒸发率的测量将采取和比较类似system.Intellectual优点的理论和数值预测：两相系统的微观几何形状的行为，特别是在光滑表面上的薄液膜的字符仍然是一个至关重要的问题，其中有活跃的辩论在传热和流体力学文献。随着微工程继续向更小的尺度发展，这些热传输问题的物理特性和建模变得更加相关和具有挑战性。高质量的试验数据是指导该领域模式和数值试验的关键。更广泛的影响：在这项研究中获得的结果将有助于指导设计和分析的丰富的微米级传热系统（热管，毛细泵回路等）。该项目将支持一名研究生的培训，与PI密切合作。该项目还将涉及一名本科生。我们还将继续建立在我们招募代表性不足的群体（通过领导力联盟）的成功历史，并将利用和参与布朗大学MRSEC外展计划，例如通过与K-12教师培训计划和高中学生研究经验计划合作。最后，我们会继续与传媒制作人（例如NOVA和探索频道）合作，为广大观众制作科学节目。