Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
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圆形微通道中冷凝过程中 R152a 两相流的流动状态和转变
DOI：
10.3389/fenrg.2021.792586
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发表时间：
2021-11
影响因子：
3.4
通讯作者：
Zhixiang Lan
中科院分区：
文献类型：
--
作者：
Na Liu;Qian Zhao;Zhixiang Lan
对制冷剂 R152a 在圆形玻璃微通道中的整个冷凝过程中的两相流态进行了实验研究。测试微通道的内径和外径分别为0.75和1.50mm。通道长 500 毫米，以便观察冷凝过程中的所有两相流状态。实验使用的饱和温度为 30 至 50°C，质量通量为 150kg/(m2·s)，蒸汽品质为 0 至 1。研究中的实验条件观察到了环形流态、间歇流态和气泡流态。分层流态的缺失表明，在这些条件下，重力效应在微通道中不再占主导地位。在微通道中观察到汽液界面波、液桥形成和汽核破裂。本研究对流态转变位置进行了定量测量。实验还显示了饱和温度和冷却水质量流量对流态转变的影响。结果表明，随着饱和温度的升高，环空流动范围减小，间歇流动和气泡流动范围变化不大。冷却水质量流量范围从38.3kg/h到113.8kg/h对流态转变影响很小。
Two-phase flow regimes were experimentally investigated during the entire condensation process of refrigerant R152a in a circular glass minichannel. The inner and outer diameters of the test minichannel were 0.75 and 1.50mm. The channel was 500mm long to allow observation of all the two-phase flow regimes during the condensation process. The experiments used saturation temperatures from 30 to 50°C, a mass flux of 150kg/(m2·s) and vapor qualities from 0 to 1. The annular, intermittent and bubbly flow regimes were observed for the experimental conditions in the study. The absence of the stratified flow regime shows that the gravitational effect is no longer dominant in the minichannel for these conditions. Vapor-liquid interfacial waves, liquid bridge formation and vapor core breakage were observed in the minichannel. Quantitative measurements of flow regime transition locations were carried out in the present study. The experiments also showed the effects of the saturation temperature and the cooling water mass flow rate on flow regime transitions. The results show that the annular flow range decreases and the intermittent and bubbly flow ranges change little with increasing saturation temperature. The cooling water mass flow rate ranging from 38.3kg/h to 113.8kg/h had little effect on the flow regime transitions.
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DOI：
10.1016/j.ijheatmasstransfer.2017.08.003
发表时间：
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影响因子：
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