核态沸腾中汽泡动力学及传热机理分析  

Bubble Dynamics and Heat Transfer Under a Single Bubble During Nucleate Pool Boiling

作　　者：毕景良[1] 柯道友[1] 林曦鹏[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2012年第7期1233-1236,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50876050);国家重点基础研究计划项目(973)(No.2011CB706904)

摘　　要：汽泡的传热及生长特性研究对于揭示核态沸腾的机理具有重要作用。本文介绍了利用高速摄像技术对核态沸腾中汽泡生长及运动现象进行实验观测,并用高速数据采集系统记录汽泡一个生长周期不同阶段的热流密度的方法。在不同的过冷度及壁面温度条件下,观测了汽泡的生长、周期性滑移、颈化和脱离现象。计算并绘制出不同条件下一个汽泡生长周期内的热流密度曲线,与汽泡图片相对应,分析并讨论了造成这些现象的机理。The heat transfer under a single bubble during the nucleate boiling ebullition cycle is analyzed to further understand the nucleate boiling mechanisms.The bubble nucleation,growth and departure cycle during nucleate boiling on a microheater were observed with a high-speed camera while the heat flux during the bubble life cycle under the bubble was recorded with a high-speed data acquisition system.The bubble growth,sliding,necking and departure correspond well with the measured heat flux variations for various wall superheats and liquid subcoolings.The results show that the boiling heat flux varies dramatically during a bubble ebullition cycle.The mechanisms of the phenomena were analyzed.

关 键 词：沸腾 汽泡生长 汽泡脱离 热流密度 

分 类 号：TK123[动力工程及工程热物理—工程热物理]