Wang Weidong, Zhang Haiyan, Tian Conghui, Meng Xiaojie
Department of Electrical and Mechanical Engineering, Xidian University, No. 2 South Taibai Road, Xi'an, Shaanxi 710071 China ; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 99 Yanxiang Road, Xi'an, Shaanxi 710054 China ; Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
Department of Electrical and Mechanical Engineering, Xidian University, No. 2 South Taibai Road, Xi'an, Shaanxi 710071 China.
Nanoscale Res Lett. 2015 Apr 1;10:158. doi: 10.1186/s11671-015-0830-6. eCollection 2015.
Evaporation and explosive boiling of ultra-thin liquid film are of great significant fundamental importance for both science and engineering applications. The evaporation and explosive boiling of ultra-thin liquid film absorbed on an aluminum nanostructure solid wall are investigated by means of molecular dynamics simulations. The simulated system consists of three regions: liquid argon, vapor argon, and an aluminum substrate decorated with nanostructures of different heights. Those simulations begin with an initial configuration for the complex liquid-vapor-solid system, followed by an equilibrating system at 90 K, and conclude with two different jump temperatures, including 150 and 310 K which are far beyond the critical temperature. The space and time dependences of temperature, pressure, density number, and net evaporation rate are monitored to investigate the phase transition process on a flat surface with and without nanostructures. The simulation results reveal that the nanostructures are of great help to raise the heat transfer efficiency and that evaporation rate increases with the nanostructures' height in a certain range.
超薄液膜的蒸发和爆沸对于科学和工程应用都具有极其重要的基础意义。通过分子动力学模拟研究了吸附在铝纳米结构固体壁上的超薄液膜的蒸发和爆沸。模拟系统由三个区域组成：液态氩、气态氩以及装饰有不同高度纳米结构的铝基板。这些模拟从复杂的液 - 气 - 固系统的初始构型开始，接着在90 K下使系统达到平衡，最后以两个不同的跳跃温度结束，这两个温度分别为150 K和310 K，远高于临界温度。监测温度、压力、密度数和净蒸发率的时空依赖性，以研究有无纳米结构的平面上的相变过程。模拟结果表明，纳米结构有助于提高传热效率，并且在一定范围内蒸发速率随纳米结构高度的增加而增大。
