间断型波纹微通道内沸腾换热特性研究  

Investigation of Boiling Heat Transfer Characteristics in Intermittent Wavy Microchannels

作　　者：汤宇轩 夏国栋[1] 宗露香 马丹丹[1] 王军[1] TANG Yu-Xuan;XIA Guo-Dong;ZONG Lu-Xiang;MA Dan-Dan;WANG Jun(MOE Key Laboratory of Enhanced Heat Tiansfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室,传热与能源利用北京市重点实验室,北京100124

出　　处：《工程热物理学报》2020年第12期3008-3013,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51976002);中国博士后基金(No.2019M660375)。

摘　　要：本文通过MEMS技术设计并加工出一种间断型波纹微通道。采用丙酮为工质,借助高速同步测量系统对间断型波纹微通道内的流动沸腾换热特性进行了实验研究。通过与传统的矩形直通道对比,分析了两种微通道的流型、换热系数和底面温度分布。实验结果表明:间断型波纹微通道的出口处能维持稳定的环状流,有效推迟了局部干涸。由于特殊的壁面结构能提升沸腾换热性能,所以间断型波纹微通道的换热系数要高于矩形直通道,增幅接近70%。相同工况下,间断型波纹微通道底面温差更小,提供了更好的温度分布均匀性。In this paper,intermittent wavy microchannels are designed and fabricated by MEMS technique.The flow boiling heat transfer characteristics of intermittent wavy microchannels are experimentally investigated using acetone as the working fluid under the aid of high-speed synchronous measurement system.The flow pattern,heat transfer coefficient and bottom wall temperature distribution are analyzed as compared to the conventional rectangular microchannels.The experimental results show that the stable annular flow can be maintained near the outlet of the intermittent wavy microchannels and the local dry-out is postponed effectively.The unique wall structure can promote the boiling heat transfer performance so that about 70% enhancement of heat transfer coefficient can be achieved with intermittent wavy microchannels compared to the rectangular microchannels.The bottom wall temperature difference of the intermittent wavy microchannels is lower than the rectangular microchannels under the same condition indicating that a better temperature uniformity can be provided.

关 键 词：微通道 沸腾 流型 换热系数 壁面温度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]