疏水表面沸腾气泡底部微液层生长特性  

Growth characteristics of microlayer at bottom of boiling bubble on hydrophobic heating surface

作　　者：高明[1] 左启蓉 张凌霜 张达 章立新[1] GAO Ming;ZUO Qirong;ZHANG Lingshuang;ZHANG Da;ZHANG Lixin(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海市动力工程多相流动与传热重点实验室,上海理工大学能源与动力工程学院,上海200093

出　　处：《化工学报》2020年第S02期46-54,共9页CIESC Journal

基　　金：国家自然科学基金项目(51506127,51976127)。

摘　　要：将激光干涉法和高速摄像技术相结合,研究了疏水ITO加热表面生成的单个乙醇气泡的动态特性,观测研究了其底部的微液层,并与之前的亲水加热表面的气泡生长脱离过程进行对比分析。本实验同时使用两台高速摄像机:一台记录气泡底部微液层干涉条纹,另一台从侧面同步记录单个气泡的生长和脱离图像。通过对这些图像逐帧比较,并与亲水表面的气泡生长过程对比后,发现疏水表面气泡的生长周期没有等待期,且脱离期时间远大于生长期,气泡底部的微液层存在形态不稳定,气泡在生长和脱离过程中会发生随机滑移现象。The laser interferometric method and high-speed camera technology are combined to study the dynamic characteristics of a single ethanol bubble generated by the hydrophobic ITO heating surface,and to study the microlayer at the bottom of the bubble.The process of bubble growth and detachment was compared and analyzed with previous hydrophilic heating surface experiments.In this experiment,two high-speed cameras were used at the same time:one recorded the interference fringes of microlayer at the bottom of the bubble,and the other recorded the growth and detachment images of the single bubble from the side view.By comparing these images frame by frame and comparing with the hydrophilic heating surface experiment,it is found that the growth period of the hydrophobic surface bubble has no waiting period,and the time of the detachment period is much longer than the growth period,the microlayer at the bottom of the bubble is unstable and random slip occurs during the growth and detachment process of the bubble.

关 键 词：气泡 相变 蒸发 微液层 疏水表面 激光干涉法 

分 类 号：TK121[动力工程及工程热物理—工程热物理]