异质表面的薄膜沸腾过程  

Nanoscale Thin Film Boiling Processes on Heterogeneous Surfaces

作　　者：高山 杨俊杰 刘志春[2] 刘伟[2] 屈健[1] GAO Shan;YANG Junjie;LIU Zhichun;LIU Wei;QU Jian(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China;School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]江苏大学能源与动力工程学院,镇江212013 [2]华中科技大学能源与动力工程学院,武汉430074

出　　处：《工程热物理学报》2024年第4期1139-1143,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52276067)。

摘　　要：本文利用非平衡态分子动力学模拟,对薄膜沸腾过程中三相界面和气泡成核的细节进行了捕捉和可视化,并记录了其内部流动和热特性。结果表明不同于宏观尺度的沸腾过程,抑制气泡成核生长使得薄膜沸腾具有非常优异的传热传质性能。总的来说,粗糙结构缩短了沸腾过程达到稳定状态所需的时间并且提高了过程效率且展现出了在高热流密度散热方面的巨大潜力。表面物理化学性质对沸腾性能的影响本质上归因于对界面热阻的调控机制,增加表面粗糙度、增强表面润湿性和增加亲水区域面积占比均会降低界面热阻进而提高表面的传热传质效率。该工作可为实现快速高效的薄膜沸腾过程提供参考,也可指导设计和优化基于气液相变过程进行传热的固体表面。This study adopted the non-equilibrium molecular dynamics simulation to capture the triple-phase interface details,visualize the bubble nucleation and record the internal fluid flow and thermal characteristics.It is found that the nanoscale thin film boiling without the occurrence of bubble nucleation shows an excellent heat and mass transfer performance.In general,rough structures advance the onset time of stable boiling and improve the efficiency,showing a great potential in high heat flux removal.It is revealed that the underlying mechanism of regulatory effects brought from surface physicochemical properties is originated form the variation of interfacial thermal resistance.It is available to reduce the overall interfacial resistance and further improve the heat and mass transfer efficiency through increasing surface roughness,enhancing surface wettability and increasing the area proportion of hydrophilic region.This work provides guidelines to achieve rapid and efficient thin film boiling,and serve as a reference for the optimized design of surfaces utilized for high-flux removal through vaporization processes.

关 键 词：薄膜沸腾 气泡成核 传热传质 界面热阻 分子动力学模拟 

分 类 号：TK121[动力工程及工程热物理—工程热物理]