| 摘要: |
| 为研究平行通道直冷板的压降特性对换热的影响，本文对不同质量通量（118~1 300 kg/（m2 s））、入口过冷度（2.5~8 K）条件下低压制冷剂R1233zd(E)在平行通道直冷板内的摩擦压降进行了实验研究，分析了单相及两相摩擦压降以及气液相速度的变化规律。结果表明：在制冷剂单相情况下，随热流密度的增加，通道内的摩擦压降先减小后增加。当制冷剂进入两相状态后，摩擦压降随热流密度的增加而快速增长；质量通量的增加会使汽化核心的位置延后，导致摩擦压降变化趋势突变点的出现有所推迟。此外，在高热流密度下，制冷剂液相速度和气液相相对速度均有所增加；相同干度条件下，较高的质量通量使气液相相对速度增加，摩擦压降增速变快。 |
| 关键词: 平行通道 流动沸腾 摩擦压降 R1233zd(E) |
| DOI： |
| 投稿时间：2021-07-27 修订日期：2021-11-04
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| 基金项目: |
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| Experimental Investigation on Flow Boiling and Pressure Drop of R1233zd (E) in Cold Plate with Parallel Channels |
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Wang Yuchen1, Fang Yidong1, Su Lin1,2, Yang Wenliang1, Zhang Zhao1
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| (1.College of Energy and Power Engineering, University of Shanghai for Science and Technology;2.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering) |
| Abstract: |
| As a critical component of two-phase cooling systems, the pressure drop characteristics of refrigerants in cold plates with parallel channels significantly affect their heat-transfer performance. In this study, experiments are conducted to investigate the frictional pressure drop of low-pressure refrigerant R1233zd(E) in a cold plate under different mass fluxes (118–1 300 kg/(m2 s)) and inlet subcooling temperatures (2–8 K). The single-phase and two-phase frictional pressure drops of the refrigerant are analyzed simultaneously with the vapor and liquid velocity characteristics. The results show that for the single-phase refrigerant, the frictional pressure drop in the channel first decreases and then increases as the heat flux increases. When the refrigerant enters the two-phase state, the frictional pressure drop increases rapidly with the heat flux. As the mass flux increases, bubble nucleation and an abrupt increase in the frictional pressure drop are delayed. In addition, both the liquid velocity and the slip ratio increase with the heat flux. At the same outlet vapor quality, a higher slip ratio is observed at higher mass fluxes, which results in a more significant increase in the frictional pressure drop. |
| Key words: parallel channel flow boiling frictional pressure drop R1233zd(E) |
