化工学报2019，Vol.70Issue(4)：1300-1310,11.DOI:10.11949/j.issn.0438⁃1157.20181070
局部表面改性紫铜方柱阵列池沸腾传热特性和机理
Pool boiling heat transfer performance and mechanism of square copper pillar arrays with partially-modified surface
摘要
Abstract
In the present study, the effects of wettability, surface topography and surfactant on the growth of bubbles and pool boiling heat transfer of straight and gradient square copper pillar arrays with partially-modified surface were investigated. The experimental medium was deionized water, 100, 200, 400, 800 mg·L-1 in isopropanol solution and n-heptanol solution. The results showed that silver deposition on square copper pillar decreases the wettability, and increases bubble number. Addition of isopropanol or n-heptanol into deionized water decreases the number and departure diameter of bubbles in the heat flux range of 66.1—202 kW·m-2. However, when the heat flux increases to 413 kW·m-2, the surfactant can effectively prevent bubbles from merging, so the boiling heat transfer coefficient of the pool boiling decreases first and then increases with the increase of the concentration. The gradient square pillar structure with upper and lower layers of 0.5 mm and 1mm and a spacing of 2 mm promotes the coalescence of bubbles and formation of a gas film on the heating surface, and then worsens pool boiling heat transfer.关键词
局部表面改性/紫铜方柱阵列/润湿性/池沸腾/表面活性剂Key words
partially-modified surface/square copper pillar array/wettability/pool boiling/surfactant分类
能源科技引用本文复制引用
牟帅,赵长颖,徐治国..局部表面改性紫铜方柱阵列池沸腾传热特性和机理[J].化工学报,2019,70(4):1300-1310,11.基金项目
国家自然科学基金项目(51576063) （51576063）
2019年度装备预研教育部联合基金青年人才基金项目(6141A02033526) （6141A02033526）
