Thermo-fluidic characteristics and performance in a distribute heating bubble pump generator

doi:10.1016/j.ijrefrig.2021.09.031

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Thermo-fluidic characteristics and performance in a distribute heating bubble pump generator
	Yang, Honghai 2; Chen, Yuping 2; Wu, Yiwei 2; Yang FC(杨丰畅)1; Huang, Xinyu 2; Xu, Yue 2; Duan, Wenli 2
刊名	INTERNATIONAL JOURNAL OF REFRIGERATION
	2022
卷号	133 页码:181-190
关键词	Bubble pump generator Distribute heating Multiple lift tubes Flow pattern evolution Lift performance Flow stability
ISSN号	0140-7007
DOI	10.1016/j.ijrefrig.2021.09.031
通讯作者	Yang, Honghai(yhh@dhu.edu.cn)
英文摘要	In some thermally driven two-phase natural circulation systems, bubble pumps serve as the key driving powers for the cycles. Recently a type of distribute heating bubble pump generator (BPG) is gradually receiving attention due to its compact structure and great potentials to utilize solar energy and low-grade waste heat recovery. The BPG provides a variety of promising features (e.g., passive heat transfer, enhanced reliability), which can benefit the advancing of heat transfer technology. For the primary study, we performed an experiment in a distributed heating BPG. Through utilizing multiple lift tubes and partial visualization configurations, it provides accesses to observe the flow pattern transition and monitor the flow instability, and thus to explore some of the underlying mechanisms affecting BPG performance. Results showed that heat input and immersion height were crucial parameters to enable the operation of distribute heating BPG. With low heat input or high inlet water subcooling level, the flow within the pump was unstable with intermittent flow interruptions. As the heat input increased, the fluid flow became more stable, the vapor generation increased linearly, while the lifted liquid flow rate initially increased then decreased. Correspondingly, the flow pattern at the outlet section of lift tubes gradually changed from slug flow to churn flow, and then to annular flow. The higher of the immersion was, the higher heat input was needed for the flow pattern transition. It was in the churn flow regime at the outlet of lift tubes for the BPG to lift a maximum liquid. At lower immersion level, liquid reflux in the lift tubes was obvious and affected the flow stability as well as the lifting performance. At higher immersion level, the fluid flow was more stable and faster, which lifted more liquid while generated less vapor depending on the inlet subcooling. In general, the BPG showed better performance (both the lifted liquid and vapor generation increased) at smaller inlet subcooling level or lower system pressure. This study highlights the flow pattern evolution and flow stability, which is helpful to the reliable design and effective operation of the distributed heating BPG.
分类号	二类
资助项目	National Key R&D Program of China[2016YFB0601404]
WOS关键词	FLOW ; SIMULATION ; CHILLER ; WORKING ; SYSTEM
WOS研究方向	Thermodynamics ; Engineering
语种	英语
WOS记录号	WOS:000729409700011
资助机构	National Key R&D Program of China
其他责任者	Yang, Honghai
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88269]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China;
推荐引用方式 GB/T 7714	Yang, Honghai,Chen, Yuping,Wu, Yiwei,et al. Thermo-fluidic characteristics and performance in a distribute heating bubble pump generator[J]. INTERNATIONAL JOURNAL OF REFRIGERATION,2022,133:181-190.
APA	Yang, Honghai.,Chen, Yuping.,Wu, Yiwei.,杨丰畅.,Huang, Xinyu.,...&Duan, Wenli.(2022).Thermo-fluidic characteristics and performance in a distribute heating bubble pump generator.INTERNATIONAL JOURNAL OF REFRIGERATION,133,181-190.
MLA	Yang, Honghai,et al."Thermo-fluidic characteristics and performance in a distribute heating bubble pump generator".INTERNATIONAL JOURNAL OF REFRIGERATION 133(2022):181-190.