组合表面高不凝气蒸汽冷凝的数值研究  

Numerical Study on Steam Condensation With High Fraction of Non-Condensable Gas on Combined Surfaces

作　　者：彭本利 周勇 生文龙 邱美竹庭 贺征宇 徐欣宇 张荣 苏风民 PENG Benli;ZHOU Yong;SHENG Wenlong;QIU Meizhuting;HE Zhengyu;XU Xinyu;ZHANG Rong;SU Fengmin(Department of Energy and Power Engineering,Naval Architecture and Ocean Engineering College,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学船舶与海洋工程学院能源与动力工程系,大连116026

出　　处：《工程热物理学报》2023年第7期1973-1981,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51906028);中央高校基本科研业务费(No.3132022121)。

摘　　要：基于不凝气工况下选择合适蒸汽冷凝润湿性表面,采用ANSYSFluent软件分别对30°、60°和90°接触角表面及相应组合表面上的冷凝进行了模拟。研究了25%不凝气含量下液滴的成核、合并机制及不同润湿性表面液滴生长周期内的冷凝传热性能,可视化分析了均匀润湿性表面不凝气边界层内液化核心的生成及冷凝液滴的动力学特征,半定量描述了均匀润湿性和组合润湿性表面上瞬态热流密度的分布及其影响机制,为含不凝气工况下不同润湿性冷凝表面的选择及传热强化提供了研究思路。In order to select the condensing surfaces with suitable wettability for inducing condensation of steam with high fraction of non-condensable gas,numerical simulations about the condensation of steam in the presence of non-condensable gas are carried out on condensing surfaces with contact angles of 30°,60°and 90°and the corresponding combined surfaces using ANSYS Fluent software,respectively.The nucleation and merging mechanisms of droplets at 25%noncondensable gas content and the condensation heat transfer performance during the growth period of droplets on surfaces with different wettability are investigated.The formation of liquefied cores in a non-condensable gas boundary layer on a uniformly wettable surface and the dynamics of condensed droplets are visualized.The distribution of transient heat flux on homogeneous and combined wettability surfaces and its infuencing mechanism are described semi-quantitatively.It provides a research idea for the selection of condensation surfaces with different wettability and heat transfer enhancement under the condition of high fraction of non-condensable gas.

关 键 词：滴状冷凝 数值研究 不凝气 组合表面 湿润性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]