脉冲加热下微尺度沸腾及微汽泡动力学  

Microscale boiling and microbubble dynamics under pulse heating

作　　者：陈钢[1] 全晓军[1] 郑平[1] 

机构地区：[1]动力机械与工程教育部重点实验室,上海交通大学机械与动力工程学院,上海200240

出　　处：《化工学报》2009年第8期1894-1899,共6页CIESC Journal

基　　金：国家自然科学基金项目(50536010);上海市科技委员会项目(08JC1411100)~~

摘　　要：利用MEMS微加工技术,在微通道内集成Pt微加热器。在一定流速下改变脉冲加热电压,利用高速CCD及数据采集卡,并通过Pt温度电阻特性关系式,观察并记录微加热器表面的沸腾现象及温度变化。通过研究,观察到随加热功率变化出现的两种微尺度沸腾现象,尤其是稳定蒸汽膜的生长在其他学者进行的相似研究中很少出现,并分析了相关的汽泡动力学,最后比较了由未完全凝结汽泡引起的两个连续脉冲过程中汽泡动力学的差异。Using microelectromechanical system （MEMS） technology, a Pt microheater fabricated on a glass wafer was placed in a silicon-based microchannel of trapezoidal cross section. With the aid of a highspeed charge coupled device （CCD） camera and based on Pt ＇s linear temperature-resistance characteristics, flow boiling phenomena and temperature response on the surface of the microheater in the microchannel under pulse heating were observed and recorded. At a given mass flux, two types of microscale boiling were observed with increasing imposed voltage, especially the growth of stable vapor film which rarely appeared in other similar researches. Finally, the corresponding microbubble dynamics and the differences during two neighbor pulse durations due to non-condensed gas were analyzed.

关 键 词：Pt微加热器 脉冲加热 微汽泡动力学 

分 类 号：TK124[动力工程及工程热物理—工程热物理]