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学科主题: 物理化学
题名: Formation characteristics of Taylor bubbles in a microchannel with a converging shape mixing junction
作者: Dang, Minhui1, 2;  Yue, Jun1;  Chen, Guangwen1;  Yuan, Quan1
通讯作者: 陈光文
关键词: Microchannel ;  Hydrodynamics ;  Taylor flow ;  Bubble ;  Microreactor
刊名: CHEMICAL ENGINEERING JOURNAL
发表日期: 2013-05-01
DOI: 10.1016/j.cej.2013.02.108
卷: 223, 页:99-109
收录类别: SCI
文章类型: Article
部门归属: 9
项目归属: 903
产权排名: 1,1
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: The bubble formation in a square microchannel with a converging shape mixing junction has been investigated under gas-liquid Taylor flow using a high-speed camera. A typical bubble formation process was found to consist of two steps including the expansion and rupture steps. The bubble length could be approximated as the product of the rupture time and two-phase mixture velocity. Significant influence of liquid viscosity and two-phase mixture velocity on the bubble length was observed, although a linear dependence of the bubble length on gas-liquid flow ratio is present for a given two-phase mixture velocity or liquid viscosity. This indicates that shear stress plays an important role in determining the bubble length in the current microfluidic device even at low Capillary numbers where the squeezing regime is expected to predominate. An empirical correlation expressing the bubble length as a function of gas-liquid flow ratio, liquid viscosity and two-phase mixture velocity was developed to describe the experimental results. The bubble frequency was found to reach a maximum as gas-liquid flow ratio is increased from 0.5 to 1. The cross-sectional shape of Taylor bubble was close to be square at low capillary numbers, which is in agreement with the literature results. (C) 2013 Elsevier B.V. All rights reserved.
关键词[WOS]: MICROFLUIDIC T-JUNCTION ;  SQUARE CROSS-SECTION ;  LIQUID 2-PHASE FLOW ;  SEGMENTED FLOW ;  MASS-TRANSFER ;  CIRCULAR CAPILLARIES ;  CFD SIMULATIONS ;  TRAIN FLOW ;  SLUG FLOW ;  GAS
语种: 英语
WOS记录号: WOS:000320631200012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117563
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Dang, Minhui,Yue, Jun,Chen, Guangwen,et al. Formation characteristics of Taylor bubbles in a microchannel with a converging shape mixing junction[J]. CHEMICAL ENGINEERING JOURNAL,2013,223:99-109.
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