微尺度通道内R134a的冷凝传热实验研究

doi:10.11949/0438-1157.20191168

摘要/Abstract

摘要：

建立采用射流冲击进行制冷剂冷却的冷凝传热实验系统，对当量直径为0.63 mm矩形微尺度通道内制冷剂R134a的冷凝传热特性进行研究。实验参数范围是制冷剂干度0~1，质量流率115~290 kg/(m²·s），饱和压力0.35~0.5 MPa，实验获得了不同工况下微尺度通道的局部冷凝传热系数，并分析了制冷剂各参数对冷凝传热的影响。实验结果表明：冷凝过程中沿制冷剂流动方向，局部冷凝传热系数会随着干度减小而减小；在一定饱和压力下，局部冷凝传热系数与局部热通量相对应；冷凝传热系数随着饱和压力减小而增大。基于实验数据，整理出适用于本实验工况下微尺度通道内R134a的冷凝传热计算公式。

关键词: 冷凝, 传热, 制冷剂R134a, 微尺度, 射流冲击, 两相流

Abstract:

A condensation heat transfer test system was built to investigate the condensation heat transfer characteristics of R134a flowing inside one multi-port extruded tube with the hydraulic diameters of 0.63 mm, and a jet impingement cooling method was used to condense superheated refrigerant. The experiments were performed at vapor quality between 0 and 1, mass flow rate of refrigerant between 115 and 290 kg/(m²·s), saturation pressure between 0.35 MPa and 0.5 MPa. The local condensation heat transfer coefficients of the tube under different working conditions were obtained, and the influences of several factors on condensation heat transfer were analyzed. The experimental results show that, in condensation process, the local condensation heat transfer coefficient will decrease with the decrease in vapor quality. At a certain saturation pressure, the condensation heat transfer coefficient and local heat flux are corresponding to each other. The condensation heat transfer coefficient will increase with the decrease in saturation pressure. On the basis of the experimental data, a new correlation is proposed to calculate condensation heat transfer coefficients of refrigerant R134a in the multi-port extruded tubes in experimental conditions.

Key words: condensation, heat transfer, refrigerant R134a, micro-scale, jet impingement, two-phase flow

中图分类号:

TK 124

詹宏波, 郑文远, 文涛, 张大林. 微尺度通道内R134a的冷凝传热实验研究[J]. 化工学报, 2020, 71(S1): 83-89.

Hongbo ZHAN, Wenyuan ZHENG, Tao WEN, Dalin ZHANG. Experimental investigation on condensation heat transfer of refrigerant R134a in micro-scale channel[J]. CIESC Journal, 2020, 71(S1): 83-89.

图/表 12

图1 射流冲击冷凝实验方案原理图

Fig.1 Schematic diagram of jet impingement condensation experiment

图2 冷凝传热实验系统示意图

Fig.2 Schematic diagram of condensation heat transfer test system

图3 微尺度通道的横截面实物图

Fig.3 Cross section photograph of micro-scale channel

图4 冷凝实验件实物图

Fig.4 Physical drawing of condensation test section

图5 冷凝实验件工作原理示意图

Fig.5 Working principle schematic diagram of condensation test section

图6 射流冲击传热系数的实验测量值与计算值比较

Fig.6 Comparison between experimental data and correlation predictions of jet impingement heat transfer coefficient

图7 沿流动方向干度、局部冷凝传热系数、壁面温度和局部冷凝热通量的分布

Fig.7 Distribution of vapor quality, local condensation heat transfer coefficient, wall temperature and local condensation heat flux in flow direction(G=115 kg/(m2·s), qˉ=13.7 kW/m2,Psat=0.39 MPa)

图8 平均冷凝传热系数随质量流率的变化

Fig.8 Change curves of average condensation heat transfer coefficients with mass flow rates

图9 相同饱和压力下局部冷凝传热系数与局部热通量的关系曲线

Fig.9 Variations of local condensation heat transfer coefficients with local heat fluxes at the same saturation pressure

图10 由文献[15]中数据整理所得R134a的冷凝传热系数与局部热通量的关系曲线

Fig.10 Variations of condensation heat transfer coefficients of R134a with local heat fluxes obtained from the data in Ref.[15]

图11 不同饱和压力下局部冷凝传热系数随局部热通量变化曲线

Fig.11 Variations of local condensation heat transfer coefficients with local heat fluxes at different saturation pressures

图12 实验测量值与经验公式计算值的比较

Fig.12 Comparison of experimental data and new correlation predictions

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