The Atomic Detail of Evaporating Menisci

蒸发弯液面的原子细节

• 批准号: 0437583
• 负责人: Jonathan Freund
• 金额: $ 23.04万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-15 至 2009-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0437583&HistoricalAwards=false
• 关键词: Atomic; Detail; Evaporating; Menisci

ABSTRACTNational Science FoundationProposal Number: CTS-0437583Principal Investigator: Freund, Jonathan B.Affiliation: University of Illinois-Urbana-ChampaignProposal Title: The atomic detail of evaporating menisciEvaporation that takes place at the junction where a solid-liquid-vapor co-exist, the so-called tri-junction, plays a critical role in multi-phase heat and mass transfer. In nucleate and other phase-change heat transfer applications, it accounts for a significant fraction of the overall evaporative mass and heat flux. Since the junction is frequently the endpoint of a thin liquid film on a surface, its behavior alters the dynamics of the entire thin film. Modeling of evaporation and boiling is primarily handled using continuum models with empirical closures. Promising continuum models of the tri-junction have been developed that couple for example hydrodynamics to kinetics. Agreement with experiment has been encouraging. It is generally known that in the thinnest liquid regions such as evaporating menisci, additional molecular effects will become important. This project will undertake the first ever atomistic simulations of evaporating menisci near solid-liquid -vapor-tri-junctions in order to observe their atomic detail. In the tri-junction, sub-scale focused atomistic simulations will be performed to investigate the local flow and fluid properties used in the unified meniscus model, namely viscosity, surface tension, thermal conductivity, and evaporation kinetics. The atomistic simulations will be interpreted in the context of a continuum lubrication model previously developed by the PI, and improvements to the overall meniscus model will then be made and validated against the full-scale atomistic simulations of the evaporating meniscus. The award has been funded by the Thermal Transport and Thermal Processing Program of the Chemical and Transport Systems Division.

摘要国家科学基金项目编号：CTS-0437583主要研究者： Freund，Jonathan B. 伊利诺伊大学厄巴纳-香槟分校提案标题：蒸发过程的原子细节蒸发发生在固-液-汽共存的交界处，即所谓的三交界处，在多相传热和传质中起着关键作用。 在核和其他相变传热应用中，它占总蒸发质量和热通量的很大一部分。 由于结通常是表面上的薄液膜的终点，因此其行为改变了整个薄膜的动力学。蒸发和沸腾的建模主要是使用经验封闭的连续模型来处理的。 有前途的连续模型的三路口已经开发出耦合，例如流体动力学。 与实验的一致性令人鼓舞。 众所周知，在最薄的液体区域，如蒸发区，额外的分子效应将变得重要。 该项目将进行有史以来第一次的原子模拟，蒸发的固体-液体-蒸汽-三结附近的水蒸气，以观察它们的原子细节。 在三结中，将进行子尺度聚焦原子模拟，以研究统一弯月面模型中使用的局部流动和流体性质，即粘度、表面张力、热导率和蒸发动力学。原子模拟将在PI先前开发的连续润滑模型的背景下进行解释，然后对整个弯月面模型进行改进，并对蒸发弯月面的全尺寸原子模拟进行验证。 该奖项由化学和运输系统部门的热运输和热处理计划资助。