High speed visualization and dynamic measurement of heat driven pumps

doi:10.1080/08916150500201529

GIEC OpenIR > 中国科学院广州能源研究所

	High speed visualization and dynamic measurement of heat driven pumps
	Shi, X; Xu, JL
	2005-10-01
发表期刊	EXPERIMENTAL HEAT TRANSFER
卷号	18 期号:4 页码:201-222
摘要	We provide the high speed flow visualization and dynamic measurement results for the U-shaped and the inverted U-shaped heat driven pumps. The U-shaped heat driven pumps at the high heating powers consist of a succession of tiny bubble nucleation, growth and coalescence process. Once the "larger" spherical bubble or the bubble slug forms, it expands quickly in both upstream and downstream directions. The increased pressure leads to the liquid discharge through the outlet check valve. When the advancing vapor/liquid interface reaches a higher position in the vertical discharge branch, the condensation heat transfer in the discharge branch shrinks the bubble slug, leading to the decreased pressure and initiating the open of the inlet check valve. Thus the fresh liquid can be sucked into the system. Heat driven pumps operating at the low heating powers display the similar process. However, two major differences are identified. (1) A full cycle includes a set of positive pressure pulses corresponding to a set of tiny bubble nucleation, growth and coalescence process in each substage. Only at the end of the cycle, an apparent negative pressure pulse is created (2) For each substage in each cycle, when the newly formed bubble slug is chasing the ahead "old" bubble slug, the deformed liquid bridge is formed due to the gravity,force effect. When the two bubble slugs are merging together, a wave vapor/liquid interface occurs along the bottom of the capillary tube. For the inverted U-shaped heat driven pumps, there are fewer positive pressure pulses included, corresponding to lesser number of new bubble nucleation, growth, and coalescence process. The bubble slug in the capillary tube is very standard with the smooth vapor/liquid interface. The cycle periods and the pumping flow rates are given versus the heating powers.
文章类型	Article
关键词	Heat Driven Pump Dynamic Measurement High Speed Flow Visualization
WOS标题词	Science & Technology ; Physical Sciences ; Technology
DOI	10.1080/08916150500201529
研究领域[WOS]	Thermodynamics ; Engineering
收录类别	SCI
语种	英语
WOS类目	Thermodynamics ; Engineering, Mechanical
WOS记录号	WOS:000232495800001
引用统计
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/10225
专题	中国科学院广州能源研究所
作者单位	Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Shi, X,Xu, JL. High speed visualization and dynamic measurement of heat driven pumps[J]. EXPERIMENTAL HEAT TRANSFER,2005,18(4):201-222.
APA	Shi, X,&Xu, JL.(2005).High speed visualization and dynamic measurement of heat driven pumps.EXPERIMENTAL HEAT TRANSFER,18(4),201-222.
MLA	Shi, X,et al."High speed visualization and dynamic measurement of heat driven pumps".EXPERIMENTAL HEAT TRANSFER 18.4(2005):201-222.