Visualization of R1233zd(E) Flow Boiling in Parallel Mini-channels

Zhang Zhao; Fang Yidong; Xu Dan; Hu Lingren; Wang Yuchen; Huang Yuqi

doi:10.3969/j.issn.0253-4339.2023.01.136

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Visualization of R1233zd(E) Flow Boiling in Parallel Mini-channels

更新时间：2024-08-14

- Visualization of R1233zd(E) Flow Boiling in Parallel Mini-channels
- Journal of Refrigeration Vol. 44, Issue 1, (2023)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院
  2. 上海市动力工程多相流动与传热重点实验室
  3. 浙江大学能源工程学院
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2023.01.136
  CLC：
- Published：2023
- 稿件说明：
移动端阅览
Zhang Zhao, Fang Yidong, Xu Dan, et al. Visualization of R1233zd(E) Flow Boiling in Parallel Mini-channels[J]. Journal of refrigeration, 2023, 44(1).
DOI：

Zhang Zhao, Fang Yidong, Xu Dan, et al. Visualization of R1233zd(E) Flow Boiling in Parallel Mini-channels[J]. Journal of refrigeration, 2023, 44(1). DOI： 10.3969/j.issn.0253-4339.2023.01.136.

摘要

本文对低压制冷剂R1233zd(E)在平行小通道内的流动沸腾换热过程进行了可视化实验研究，分析了制冷剂在平行通道内流型的演变与分布，在此基础上讨论了流型对换热特性的影响规律。结果表明：随热流密度的增加，在通道内观察到泡状流、段塞流、搅拌流和波形环状流；在较高的热流密度下，部分通道出现回流现象。此外，不同通道内流型的分布规律略有不同；通道中局部表面传热系数变化趋势随流型的演变可以分为不同阶段，中部与出口处的局部表面传热系数呈现不同的变化趋势；当干度小于0.1时，表面传热系数几乎不受质量通量的影响；随着干度增加，表面传热系数与质量通量呈正相关关系。

Abstract

This study conducts a visual experimental investigation on low-pressure refrigerant R1233zd(E) in a parallel mini-channel heat sink. The evolution and distribution of flow patterns in parallel channels and the influence of flow patterns on heat-transfer characteristics were analyzed. Four flow patterns (bubbly flow

slug flow

churn flow

and wavy-annular flow) were observed in the channels when increasing the heat flux. At high heat flux levels

reverse flow occurs in some channels. In addition

it is observed that the distribution of flow patterns in different channels is slightly different. The variation trend of the local surface coefficient of the heat transfer can be divided into different stages based on the evolution of the flow pattern. Moreover

the middle and outlet local surface coefficients of the heat transfer exhibit different variation trends. When the vapor quality is less than 0.1

the surface coefficient of the heat transfer is almost independent of the mass flux. With an increase in vapor quality

the surface coefficient of the heat transfer is positively correlated with the mass flux.

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Related Author

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Related Institution

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University

College of energy and power engineering, University of Shanghai for Science and Technology

Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering

College of Modern Logistics, Guangzhou Panyu Polytechnic

School of Energy and Power Engineering, Huazhong University of Science and Technology

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