沸腾汽泡微液层变化规律的实验研究  

Experimental Study of the Microlayer Beneath Nucleation Bubble

作　　者：高明[1] 章立新[2] 郑平[1] 全晓军[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《工程热物理学报》2013年第5期931-934,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51036005;No.51146006);上海市重点学科资助项目(No.J50501)

摘　　要：核态沸腾中位于汽泡底部的微液层在热量传递的过程里起到了至关重要的作用.本文用激光干涉法结合高速摄影技术清晰地记录了沸腾汽泡生长过程中微液层干涉图样的变化过程,分析了干区出现后三相接触线的变化规律,从实验中发现微液层干区半径随时间的变化呈现出良好的线性趋势。本文对干区出现前后汽泡基圆半径的变化规律进行了分析,在干区出现之前汽泡基圆半径随时间迅速增加,在干区出现之后,基圆半径的变化趋势趋于平缓。本文通过积分法计算了汽泡成长过程中微液层体积的变化规律,微液层体积呈现出先增大后减小的变化趋势。A thin liquid film exists at the bottom of boiling bubbles. It plays an important role in the boiling heat transfer process. The high-speed camera techniques and laser interferometric method are used to study dynamic characteristics of the microlayer during nucleation process. A linear relationship between the gas-liquid-solid triple contact line with respect to bubble growth time is presented. Before appearance of a dry spot, the microlayer volume increases with time, and the bubble root radius increases rapidly. After the appearance of a dry spot, the microlayer volume begins to decrease, and the bubble root radius increases become smaller subsequently.

关 键 词：微液层 激光干涉 汽泡动力学 

分 类 号：TK123[动力工程及工程热物理—工程热物理]