具有相同纵横比的梯形微通道内水蒸气流动凝结换热系数  

Heat Transfer Coefficients of Steam Condensation in Trapezoidal Microchannels with Same Aspect Ratio

作　　者：全晓军[1] 董丽宁[1] 郑平[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2009年第9期1432-1436,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50536010;50476017)

摘　　要：采用微通道内壁集成Pt电阻测量温度的方法,试验研究了具有相同纵横比的2个硅基梯形微通道内水蒸气的流动凝结换热系数,并基于湍流热边界层分析,建立了剪切力驱动的环状流换热系数半理论模型.结果表明,冷凝换热系数随水蒸气质量流量及其干度的增加而增大,在水力直径较小的通道中,微通道换热效率较高.Using integrated Pt thermoresistors to measure the internal-wall temperature of microchannel directly, an experiment was conducted to measure the condensation heat transfer coefficient in two silicon microchannels with same aspect ratio. The condensation heat transfer coefficients decrease with the hydraulic diameter of microchannels and increase with the mass flux and quality. Semi-analytical method, based on thermal boundary layer theory of turbulent flow, was used to derive the condensation heat transfer coefficients of annular condensation flow, which is shown in good agreement with the obtained experimental data.

关 键 词：微通道 流动凝结 集成Pt电阻 换热系数 

分 类 号：TK121[动力工程及工程热物理—工程热物理]