Multi-channel effect of condensation flow in a micro triple-channel condenser

doi:10.1016/j.ijmultiphaseflow.2008.05.004

GIEC OpenIR > 中国科学院广州能源研究所

	Multi-channel effect of condensation flow in a micro triple-channel condenser
	Zhang, Wei 1,2; Xu, Jinliang 1; Liu, Guohua 1,2
	2008-12-01
发表期刊	INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
ISSN	0301-9322
卷号	34 期号:12 页码:1175-1184
通讯作者	xujl@ms.giec.ac.cn
摘要	Multi-channel effect is important to understand transport phenomenon in phase change systems with parallel channels. In this paper, visualization studies were performed to study the multi-channel effect in a silicon triple-channel condenser with an aspect ratio of 0.04. Saturated water vapor was pumped into the microcondenser, which was horizontally positioned. The condenser was cooled by the air natural convention heat transfer in the air environment. Flow patterns are either the annular flow at high inlet vapor pressures, or a quasi-stable elongated bubble at the microchannel upstream followed by a detaching or detached miniature bubble at smaller inlet vapor pressures. The downstream miniature bubble was detached from the elongated bubble tip induced by the maximum Weber number there. It is observed that either a single vapor thread or dual vapor threads are at the front of the elongated bubble. A miniature bubble is fully formed by breaking up the vapor thread or threads. The transient vapor thread formation and breakup process is exactly symmetry against the centerline of the center channel. In side channels, the Marangoni effect induced by the small temperature variation over the channel width direction causes the vapor thread formation and breakup process deviating from the side channel centerline and approaching the center channel. The Marangoni effect further forces the detached bubble to rotate and approach the center channel, because the center channel always has higher temperatures, indicating the multi-channel effect. (C) 2008 Elsevier Ltd. All rights reserved.
文章类型	Article
其他摘要	Multi-channel effect is important to understand transport phenomenon in phase change systems with parallel channels. In this paper, visualization studies were performed to study the multi-channel effect in a silicon triple-channel condenser with an aspect ratio of 0.04. Saturated water vapor was pumped into the microcondenser, which was horizontally positioned. The condenser was cooled by the air natural convention heat transfer in the air environment. Flow patterns are either the annular flow at high inlet vapor pressures, or a quasi-stable elongated bubble at the microchannel upstream followed by a detaching or detached miniature bubble at smaller inlet vapor pressures. The downstream miniature bubble was detached from the elongated bubble tip induced by the maximum Weber number there. It is observed that either a single vapor thread or dual vapor threads are at the front of the elongated bubble. A miniature bubble is fully formed by breaking up the vapor thread or threads. The transient vapor thread formation and breakup process is exactly symmetry against the centerline of the center channel. In side channels, the Marangoni effect induced by the small temperature variation over the channel width direction causes the vapor thread formation and breakup process deviating from the side channel centerline and approaching the center channel. The Marangoni effect further forces the detached bubble to rotate and approach the center channel, because the center channel always has higher temperatures, indicating the multi-channel effect.
关键词	Condensation Multi-channel Effect Flow Pattern Microchannel Marangoni Effect
WOS标题词	Science & Technology ; Technology
DOI	10.1016/j.ijmultiphaseflow.2008.05.004
研究领域[WOS]	Mechanics
URL	查看原文
关键词[WOS]	CIRCULAR MICROCHANNELS ; HEAT-TRANSFER ; HORIZONTAL MICROCHANNELS ; FILM CONDENSATION ; PRESSURE-DROP ; PATTERNS ; SQUARE ; TRAIN ; MODEL ; TUBE
收录类别	SCI
语种	英语
项目资助者	Natural Science Foundation of China [50776089]; National Basic Research Program [2006CB601203]
WOS类目	Mechanics
WOS记录号	WOS:000261281100008
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/3406
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Micro Energy Syst Lab, Key Lab Renewable Energy & Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wei,Xu, Jinliang,Liu, Guohua. Multi-channel effect of condensation flow in a micro triple-channel condenser[J]. INTERNATIONAL JOURNAL OF MULTIPHASE FLOW,2008,34(12):1175-1184.
APA	Zhang, Wei,Xu, Jinliang,&Liu, Guohua.(2008).Multi-channel effect of condensation flow in a micro triple-channel condenser.INTERNATIONAL JOURNAL OF MULTIPHASE FLOW,34(12),1175-1184.
MLA	Zhang, Wei,et al."Multi-channel effect of condensation flow in a micro triple-channel condenser".INTERNATIONAL JOURNAL OF MULTIPHASE FLOW 34.12(2008):1175-1184.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Multi-channel effect（538KB）			开放获取	--	浏览下载