表面微结构对蒸汽冷凝换热影响的数值模拟  

Numerical Simulation of the Influence of Surface Microstructure on Steam Condensation Heat Transfer

作　　者：徐立[1,2] 胡明超 章义平 涂述涛 XU Li;HU Mingchao;ZHANG Yiping;TU Shutao(School of Marine and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Key Laboratory of High Performance Shtip Technology,Ministry of Education,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,武汉430063 [2]武汉理工大学高性能船舶技术教育部重点实验室,武汉430063

出　　处：《武汉理工大学学报(交通科学与工程版)》2025年第2期312-317,共6页Journal of Wuhan University of Technology(Transportation Science & Engineering)

摘　　要：文中提出一种椭圆形凹陷微结构来减小冷凝液滴与壁面之间的黏附力,并基于不同的液滴冷凝状态实现液滴定向聚集,及时清理壁面的冷凝液滴维持设备的正常运行.基于混合格子Boltzmann方程(LBE)模型,针对不同微结构的水平壁面珠状冷凝过程进行了数值模拟.研究了椭圆形凹陷的半轴长度对冷凝过程液滴分布,生长、融合的影响.结果表明:椭圆形凹陷微结构壁面冷凝效果优于平直壁面,成核时间早于矩形凹陷微结构壁面.同时,发现在半轴长度逐渐增加的一组椭圆形凹陷微结构表面上,冷凝液滴可以实现定向聚集的效果.An elliptical concave microstructure was proposed to reduce the adhesion between condensate droplets and the wall.The directional aggregation of droplets was realized based on different conden-sation states of droplets,and the condensed droplets on the wall were cleaned in time to maintain the normal operation of the equipment.Based on the mixed lattice Boltzmann equation(LBE)model,the bead condensation process on horizontal walls with different microstructures was numerically simula-ted.The influence of the length of the semi-axis of the oval depression on the droplet distribution,growth and fusion during condensation was studied.The results show that the condensation effect of elliptical concave microstructure wall is better than that of straight one,and the nucleation time is ear-lier than that of rectangular concave microstructure wall.Meanwhile,it is found that condensate droplets can achieve the effect of directional aggregation on a group of elliptical concave microstructure surfaces with increasing semi-axis length.

关 键 词：格子Boltzmann方程 定向聚集 椭圆形凹陷结构 珠状冷凝 

分 类 号：U673.3[交通运输工程—船舶及航道工程]