微通道热沉内R134a流动沸腾实验研究  

Experimental Study on R134a Flow Boiling in Microchannels Heat Sink

作　　者：张志强 贾力 党超 银了飞 丁艺 ZHANG Zhiqiang;JIA Li;DANG Chao;YIN Liaofei;DING Yi(Institute of Thermal Engineering,School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale,Beijing 100044,China)

机构地区：[1]北京交通大学机械与电子控制工程学院,热能工程研究所,北京100044 [2]微细尺度流动与相变传热北京市重点实验室,北京100044

出　　处：《工程热物理学报》2024年第11期3487-3493,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金联合基金资助项目(No.U2141219)。

摘　　要：实验研究了低沸点工质R134a在铝基微通道热沉内的流动沸腾特性,分析了饱和温度、质量流速以及热流密度对流动沸腾换热系数、压降、通道沿程壁温分布及流动不稳定性的影响。结果表明:在中高热流密度下换热系数随质量流速的增加快速提升,换热系数最高达到53694 W·m^(−2)K^(−1)。饱和温度越高,微通道热沉进出口压降越小,压降振荡幅值也越小。随着质量流速的增加,通道沿程壁面温度呈现较好的均匀性且压降振荡不稳定性得到抑制。An experimental study was conducted to investigate the flow boiling characteristics of low-boiling-point working fluid R134a in an aluminum-based microchannels heat sink.The effects of saturation temperature,mass flux,and heat flux on the flow boiling heat transfer coefficient(HTC),pressure drop,wall temperature distribution along the flow channel,and flow instability were analyzed.The results showed that the HTC increased rapidly with the increase of mass flux at medium-and-high heat flux,reaching a maximum of 53694 W·m^(−2)·K^(−1).The higher the saturation temperature,the smaller the pressure drop and amplitude of pressure drop fluctuations.With the increase of mass flux,the wall temperature distribution showed good uniformity and the instability of pressure drop fluctuation was suppressed.

关 键 词：微通道 流动沸腾 传热 压降 不稳定性 

分 类 号：TK123[动力工程及工程热物理—工程热物理]