微细加热丝过冷核态沸腾汽泡行为的再观测  

Revisiting Bubble Behaviors During Subcooled Nucleate Boiling on Microwires

作　　者：周乐平[1] 魏龙亭 李媛园[1] 杜小泽[1] 王补宣[2] 

机构地区：[1]华北电力大学能源动力与机械工程学院暨电站设备状态监测与控制教育部重点实验室,北京102206 [2]清华大学热能工程系,北京100084

出　　处：《工程热物理学报》2015年第3期582-586,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50906024);北京市自然科学基金资助项目(No.3102026);中央高校基本科研业务费专项资金资助项目(No.12ZX02)

摘　　要：微尺度加热表面过冷核态沸腾传热实验的可视化观测、局部细节过程的记录是其机理研究的重要方法。本文利用高速摄像仪分别对30μm、50μm和60μm铂丝在过冷下汽泡生长及运动情况进行了系统观测。观测到与以往微尺度和常规尺度下加热丝表面汽泡行为不同的"新"特征:微细加热丝上的过热薄液层现象,汽泡在合适热流下的悬浮运动以及汽泡间出现环绕运动等一些实验现象。Bubble behaviors are crucial to the mechanisms of heat transfer process in nucleate boiling on a microscale heated object.In this investigation,bubble dynamics during subcooled boiling on platinum micro heating wires,30,50 and 60 μm in diameter and submerged in pure water,is investigated experimentally,using a high speed CCD camera.Besides the prominent sweeping and bubble-top jet flow process that can be seen in the previous observations,some 'new' phenomena are observed through the systematic study.These phenomena include the circling of small bubbles around a bigger one for the subcooled boiling on the 60 μm wire,while it can be observed occasionally for the30 μm and 50 μm wires,which indicates that heater size has obvious influence on the bubble motion and growth;and the movement of a small suspending bubble near the heated wire or a stationary bubble.

关 键 词：过冷 核态沸腾 汽泡 射流 绕流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]