Experimental Investigation on Flow Pattern and Bubble Behavior during Subcooled Flow Boiling of R1233zd(E) in Parallel Channels

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  • 1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2. Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
    3. Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Jiaxing Research Institute, Zhejiang University, Jiaxing 314031, China
    4. Key Laboratory of Smart Thermal Management Science & Technology for Vehicles of Zhejiang Province, Taizhou 317200, China

网络出版日期: 2023-11-26

基金资助

The authors would like to thank Honeywell International Inc, China for the financial and material supports provided in this study. The corresponding author would also like to thank the financial support from National Natural Science Foundation of China (52076193). 

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Experimental Investigation on Flow Pattern and Bubble Behavior during Subcooled Flow Boiling of R1233zd(E) in Parallel Channels

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  • 1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2. Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
    3. Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Jiaxing Research Institute, Zhejiang University, Jiaxing 314031, China
    4. Key Laboratory of Smart Thermal Management Science & Technology for Vehicles of Zhejiang Province, Taizhou 317200, China

Online published: 2023-11-26

Supported by

The authors would like to thank Honeywell International Inc, China for the financial and material supports provided in this study. The corresponding author would also like to thank the financial support from National Natural Science Foundation of China (52076193). 

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

本文对并联通道内R1233zd(E)过冷流动沸腾过程的汽液两相流型和汽泡行为进行了实验研究。实验段由21根水力直径为1.5 mm、长度为140 mm的并联矩形通道组成。结果表明,随干度升高,依次观察到泡状流、塞状流、搅拌流和波形环状流,此外还观察到多种流型并存的过渡流型。两相流型的分布呈时间非同步及空间非对称特征,在距离入口较远的通道中,流型发展出现的时间较早。通道内部汽泡的初始核化位置也呈现随机非对称分布,部分通道中的汽泡在液相蒸发及汽泡聚并的共同作用下发生较快速的生长。换热系数的变化规律与流型发展相对应,沿工质流动方向呈不同的变化趋势,而距离入口较远的通道的换热系数更高。此外,工质质量通量的增加会导致流型发展和换热系数的变化出现延迟。

本文引用格式

FANG Yidong, ZHANG Zhao, XU Dan, WANG Yuchen, YANG Huinan, HUANG Yuqi . Experimental Investigation on Flow Pattern and Bubble Behavior during Subcooled Flow Boiling of R1233zd(E) in Parallel Channels[J]. 热科学学报, 2023 , 32(6) : 2374 -2385 . DOI: 10.1007/s11630-023-1821-z

Abstract

In this study, the flow pattern and bubble behavior of R1233zd(E) during subcooled flow boiling in parallel channels are experimentally investigated with visualization and thermal measurement. The test section is composed of 21 rectangular mini channels with the hydraulic diameter of 1.5 mm and the length of 140 mm. Bubbly flow, slug flow, churn flow and wavy-annular flow occur in sequence with the increase of vapor quality, while transient flow pattern transition process involving multiple flow patterns are also captured. The distribution of flow pattern is non-synchronized and axial-asymmetric, with earlier flow pattern transitions observed in peripheral channels away from the center axis. The initial nucleate site in each channel also show a random and axial-asymmetric distribution, while faster bubble growth can be noted in some channel under the comprehensive effects of liquid evaporation and bubble coalescence. The variation of heat transfer coefficient is correspondence to the flow pattern transition, showing different trends along the flow direction. The increase of mass flux can lead to delayed flow pattern transition and variation of heat transfer coefficient. In addition, higher heat transfer coefficient can be noted in channels away from the center axis.

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