R134a在菱形离散肋微小通道内的流动沸腾换热实验研究  

Experimental study on flow boiling heat transfer of R134a in mini channel with diamond pin fin array

作　　者：王玉兵 李杰[1] 詹宏波 朱光亚[1] 张大林[1] WANG Yubing;LI Jie;ZHAN Hongbo;ZHU Guangya;ZHANG Dalin(Institute of Air Conditioning and Refrigeration,Key Laboratory of Aircraft Environment Control and Life Support,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China;Key Laboratory of Aviation Electromechanical Integration Technology,Nanjing 211106,Jiangsu,China)

机构地区：[1]南京航空航天大学航空学院,飞行器环境控制与生命保障工业和信息化部重点实验室,江苏南京210016 [2]航空机电系统综合航空科技重点实验室,江苏南京211106

出　　处：《化工学报》2023年第9期3797-3806,共10页CIESC Journal

基　　金：教育部“春晖计划”合作科研项目(202201007)。

摘　　要：研究了制冷剂R134a在角度分别为30°、60°和90°的菱形离散肋微小通道内的流动沸腾换热特性。微小通道内菱形离散肋分布区域长300 mm、宽20 mm,进口处饱和压力为(700±5)kPa,其他工况范围为:干度0~1,质量流率200~500 kg(/m2·s),热通量10~30 kW/m2。实验结果表明:离散肋中的流动沸腾换热受到核态沸腾和对流沸腾的共同作用,传热系数随质量流率和热通量的增加而增加,但随着干度的升高,热通量的作用减弱并趋于消失。此外,离散肋结构对流动沸腾换热有显著影响,相同工况下,90°菱形离散肋的传热系数高于30°和60°,且在高干度更显著。最后,基于实验数据和分析结论,提出了一个适用于预测不同结构离散肋微小通道中流动沸腾传热系数的计算关联式。The flow boiling heat transfer characteristics of refrigerant R134a in rhombus discrete rib mini channels with angles of 30°,60°and 90°were studied.The distribution area of diamond pin fin array in the mini channel is 300 mm long and 20 mm wide.The experiments were performed at a saturation pressure of(700±5)kPa at the inlet of the test channel,vapor quality from 0 to 1,mass flux between 200 kg/(m2·s)and 500 kg/(m2·s),and heat flux in range of 10—30 kW/m2.The results indicate that the flow boiling in the pin fin array is governed by nucleate boiling and convective boiling,the boiling heat transfer coefficient increases with the increase of mass flux and heat flux,but as vapor quality increases,the influence of heat flux almost disappears.In addition,differences in geometry of pin fin will affect the flow boiling heat transfer,the heat transfer coefficient of the diamond pin fin array at 90°is higher than that at 30°and 60°,and it is more significant at high vapor quality.Finally,on the basis of the analysis conclusion and the experimental data,a new correlation is proposed to predict the flow boiling heat transfer coefficient for mini channel with pin fin array of different structures.

关 键 词：离散肋 微尺度 流动沸腾 传热 两相流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]