化工学报 ›› 2022, Vol. 73 ›› Issue (11): 4938-4947.DOI: 10.11949/0438-1157.20221047

• 流体力学与传递现象 • 上一篇    下一篇

微小菱形离散肋通道中R134a的冷凝换热实验研究

刘冉1(), 李杰1, 王玉兵1,2, 詹洪波2, 张大林1()   

  1. 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
  • 收稿日期:2022-07-26 修回日期:2022-09-10 出版日期:2022-11-05 发布日期:2022-12-06
  • 通讯作者: 张大林
  • 作者简介:刘冉(1998—),女,硕士研究生,liuranl@nuaa.edu.cn

Experimental study on condensation heat transfer of R134a in mini channel with micro diamond fins

Ran LIU1(), Jie LI1, Yubing WANG1,2, Hongbo ZHAN2, Dalin ZHANG1()   

  1. 1.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
    2.Key Laboratory of Aviation Electromechanical Integration Technology, Nanjing 211106, Jiangsu, China
  • Received:2022-07-26 Revised:2022-09-10 Online:2022-11-05 Published:2022-12-06
  • Contact: Dalin ZHANG

摘要:

建立了采用空气射流冲击冷却方法的冷凝换热实验系统,对R134a在铝质微小菱形离散肋通道中的冷凝换热特性进行了实验研究。实验工况范围为制冷剂干度0~1、饱和压力0.50~1.50 MPa、制冷剂质量流率160~380 kg/(m2·s)、热通量10.1~59.8 kW/m2。实验获得了不同工况下的通道局部冷凝传热系数,分析了干度、饱和压力、质量流率以及热通量对冷凝换热的影响规律。实验结果表明:局部冷凝传热系数随干度、质量流率和局部热通量的减小而减小,随饱和压力的降低而增大,其中在干度x>0.4的区域内质量流率对于冷凝传热系数的影响效果更为明显。基于实验数据,提出了一个适用于本实验中微小菱形离散肋通道的冷凝换热计算公式。

关键词: 冷凝, 微尺度, 传热, 射流冲击, 两相流

Abstract:

An experimental system of condensation heat transfer using air jet impinged cooling method was established to investigate the condensation heat transfer characteristics of R134a in mini channel with micro diamond fins. The experiments were performed at vapor quality between 0 and 1, saturation pressure between 0.50 MPa and 1.50 MPa, mass flux of refrigerant between 160 kg/(m2·s) and 380 kg/(m2·s), and heat flux between 10.1 kW/m2 and 59.8 kW/m2. The local condensation heat transfer coefficient of the channel under different working conditions was obtained, and the influences of vapor quality, saturation pressure, mass flux and heat flux on the condensation heat transfer were analyzed. The experimental results show that, in condensation process, the local condensation heat transfer coefficient decreases with the decrease of vapor quality, mass flux and heat flux, and increases with the decrease of saturation pressure. Based on the experimental data, a calculation formula of condensation heat transfer suitable for the tiny diamond-shaped discrete rib channels in this experiment is proposed.

Key words: condensation, microscale, heat transfer, jet impingement, two-phase flow

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