Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Multi-channel effect of condensation flow in a micro triple-channel condenser | |
| Zhang, Wei1,2; Xu, Jinliang1; Liu, Guohua1,2 | |
| 2008-12-01 | |
| Source Publication | INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
 |
| ISSN | 0301-9322 |
| Volume | 34Issue:12Pages:1175-1184 |
| Corresponding Author | xujl@ms.giec.ac.cn |
| Abstract | 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. |
| Subtype | Article |
| Other Abstract | 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. |
| Keyword | Condensation Multi-channel Effect Flow Pattern Microchannel Marangoni Effect |
| WOS Headings | Science & Technology ; Technology |
| DOI | 10.1016/j.ijmultiphaseflow.2008.05.004 |
| WOS Subject Extended | Mechanics |
| URL | 查看原文 |
| WOS Keyword | CIRCULAR MICROCHANNELS ; HEAT-TRANSFER ; HORIZONTAL MICROCHANNELS ; FILM CONDENSATION ; PRESSURE-DROP ; PATTERNS ; SQUARE ; TRAIN ; MODEL ; TUBE |
| Indexed By | SCI |
| Language | 英语 |
| Funding Organization | Natural Science Foundation of China [50776089]; National Basic Research Program [2006CB601203] |
| WOS Subject | Mechanics |
| WOS ID | WOS:000261281100008 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/3406 |
| Collection | 中国科学院广州能源研究所 |
| Affiliation | 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 |
| Recommended Citation 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. |
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