纳米级液体膜蒸发机制的转变:分子动力学对曲率和膜厚的影响

IF 5.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Mingjun Liao, Qianyi Liu, Wenpeng Hong, Fangfang Xie
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引用次数: 0

摘要

本研究首次系统地揭示了纳米级液体膜在平面和弯曲金属基板上的蒸发行为,解决了对非平面界面相变现象理解的关键空白。通过构建具有平面或球形金衬底的几何一致性系统,并检测不同厚度(2-9 nm)的氩气液膜,我们全面分析了表面曲率对界面传热、蒸发锋动力学和能量转换效率的影响。模拟结果表明,在薄膜较薄的条件下,曲面通过降低界面热阻和增强分子激发来显著提高蒸发效率。进一步提出了半定量理论模型,建立了蒸发效率与薄膜厚度和衬底曲率半径的反比关系,有效地捕捉了模拟中观察到的效率趋势。这项工作不仅加深了对曲面界面蒸发动力学的基本认识,而且为微/纳米系统热管理设计提供了新的理论和方法基础,具有重要的科学和工程价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transition of evaporation mechanisms in nanoscale liquid films: Effects of curvature and film thickness from molecular dynamics
This study presents the first molecular dynamics investigation that systematically reveals the evaporation behavior of nanoscale liquid films on both planar and curved metallic substrates, addressing a critical gap in the understanding of phase change phenomena at non-planar interfaces. By constructing geometrically consistent systems with either flat or spherical gold substrates, and examining argon liquid films of varying thicknesses (2–9 nm), we comprehensively analyze the effects of surface curvature on interfacial heat transfer, evaporation front dynamics, and energy conversion efficiency. Simulation results demonstrate that the curved surface significantly enhances evaporation efficiency by reducing interfacial thermal resistance and intensifying molecular excitation, particularly under thinner film conditions. A semi-quantitative theoretical model is further proposed, establishing an inverse dependence of evaporation efficiency on both film thickness and substrate curvature radius, effectively capturing the efficiency trends observed in the simulations. This work not only deepens the fundamental understanding of evaporation dynamics on curved interfaces but also provides a new theoretical and methodological basis for thermal management design in micro/nanoscale systems, offering substantial scientific and engineering value.
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来源期刊
CiteScore
10.30
自引率
13.50%
发文量
1319
审稿时长
41 days
期刊介绍: International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer
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