方柱和圆柱微结构表面上蒸汽的珠状凝结  

Vapor Dropwise Condensation on the Surface with Micro Square Columns and Cylinders

作　　者：彭毅[1] 吴宣 李志斌 杨雄 PENG Yi;WU Xuan;LI Zhi-bin;YANG Xiong(School of Mechanical Engineering,Guizhou University,Guiyang,China,Post Code:550025)

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025

出　　处：《热能动力工程》2021年第4期80-86,93,共8页Journal of Engineering for Thermal Energy and Power

基　　金：贵州省自然科学基金([2017]1031,[2019]1101);贵州省科技计划项目([2018]5788)。

摘　　要：为分析不同微结构表面上的凝结传热特性,通过飞秒激光技术在硅表面上加工出两种微结构-圆柱和方柱,其接触角均超过150°。在搭建可视化凝结实验平台的基础上,通过实验对两种不同微结构表面的凝结传热性能及液滴动态特性进行了研究。实验研究表明:在同一流量条件下,随着表面过冷度的增加,珠状凝结的热流量增加,而传热系数下降;当冷却水流量从40 g/min增大到446.9 g/min时,微结构表面的热通量从25.32 kW/m^(2)增加到137.19 kW/m^(2);由于表面微结构形状和排列方式的不同,相同条件下圆柱微结构表面比方柱微结构表面具有更好的传热性能。In order to analyze the characteristics of condensation heat transfer on different micro-structured surfaces,two kinds of micro-structures with contact angles larger than 150°,cylinders and square columns,were fabricated on silicon surface by femtosecond laser technology in this paper.Moreover,a visual experimental platform of condensation was set up to investigate the condensation heat transfer performance and droplet dynamic characteristics.The results show that with the increase of surface subcooling,the heat flux increases but heat transfer coefficient decreases.In addition,the heat flux of the micro-structured surface increases from 25.32 kW/m^(2) to 137.19 kW/m^(2) when the cooling water flow rate increases from 40 g/min to 446.9 g/min.Under the same experimental conditions,the micro-structured surface with cylinders has better heat transfer performance than that with square columns due to the different shape and arrangement of the micro-structures.

关 键 词：珠状凝结 微结构表面 超疏水 不凝气体 传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]