高热流密度下微纳表面过冷流动沸腾传热特性  

Subcooled flow boiling heat transfer for hybrid micro/nanostructured surface with high heat flux incidence

作　　者：黄桓淳 黄生洪 周展如 HUANG Huanchun;HUANG Shenghong;ZHOU Zhanru(CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,Anhui,China)

机构地区：[1]中国科学技术大学材料力学行为和设计重点实验室,安徽合肥230027

出　　处：《实验力学》2024年第4期434-442,共9页Journal of Experimental Mechanics

基　　金：中国科学院合肥大科学中心协同创新培育基金项目(2022HSC-CIP021);国家磁约束聚变专项项目(2015GB121007);合肥物质科技中心创新项目(2018ZYFX001)。

摘　　要：微纳结构表面的强化传热技术在高热流密度的电子设备和托卡马克偏滤器等冷却系统中有很大的应用潜能。微纳表面过冷流动沸腾传热过程复杂,其传热特性的影响因素及其影响机制尚不明确,因此限制了微纳表面的广泛应用。针对这一问题,对3种不同结构的微纳表面开展了水的过冷流动沸腾实验研究,实验条件如下:压力为0.5MPa、1MPa与1.5MPa,流速为1m/s、3m/s与5m/s,入口过冷度为303K、313K与323K,热流密度为3.4MW/m^(2)~13.1MW/m^(2)。基于实验得到的530组过冷流动沸腾传热实验数据,评估了现有文献中的25个流动沸腾传热系数经验关系式,表现最好的公式是Kutateladz公式,其平均绝对误差为22.2%。评估结果可为微纳表面强化传热技术在冷却系统中的应用提供参考。The subcooled flow boiling enhanced heat transfer technology of water on hybrid micro/nano-structured surfaces has great potential for applications in high heat flux cooling systems such as electronic devices and tokamak divertors.However,the process of subcooled flow boiling heat transfer on hybrid micro/nano-structured surfaces is complex,and the effects of heat transfer performance and the mechanism are not yet clear.This lack of clarity hinders application of micro/nano-structured surfaces.To address these issues,experimental studies on subcooled flow boiling were conducted on three different hybrid micro/nano-structured surfaces.A total of 530 experimental data points of subcooled flow boiling heat transfer of water on hybrid micro/nano-structured surfaces were obtained using vacuum brazing technique.The parameters considered in the experiments included heat flux(ranging from 3.4MW/m^(2)to 13.1MW/m^(2)),pressures of 0.5MPa,1MPa and 1.5MPa,liquid velocities of 1m/s,3m/s and 5m/s,inlet temperatures of 303K,313K and 323K.The measurements of the heat transfer coefficient with different micro/nano-structured surfaces were compared with 25 empirical correlations from various papers.The correlation of Kutateladz was found to have the best prediction accuracy,with a MAD of 22.2%.These evaluation results provide a useful reference for the application of hybrid micro/nano-structured surfaces.

关 键 词：微纳复合结构表面 过冷流动沸腾 传热系数 经验关系式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]