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题名: Effect of surface properties on the flow characteristics and mass transfer performance in microchannels
作者: Zhao, Yuchao1;  Su, Yuanhai1;  Chen, Guangwen1;  Yuan, Quan1
关键词: Immiscible fluids ;  Microreactor ;  Microchannel ;  Mass transfer ;  Surface modification
刊名: CHEMICAL ENGINEERING SCIENCE
发表日期: 2010-03-01
DOI: 10.1016/j.ces.2009.10.027
卷: 65, 期:5, 页:1563-1570
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: In this work, the influence of surface properties on the flow characteristics and mass transfer performance of two immiscible liquids are investigated in the opposed and cross-flow configuration microchannels, as the volumetric flux ratio is far <1. For visually identifying flow patterns in transparent PMMA microchannels, dyed de-ionized water and kerosene are selected as test fluids. To investigate the mass transfer characteristics in stainless steel microchannels, water-succinic acid-n-butanol is chosen as a typical system. Reynolds number varied between 11 and 275. Only at low Rem numbers, the dispersed phase flow pattern can occur in the opposed T-shaped PMMA microchannel before surface modification. At higher Rem numbers, only the continuous phase flow pattern (parallel flow) is observed before and after surface modification. Moreover, the fluctuation amplitude after surface modification is larger than before surface modification at the opposed T-junction. To eliminate the effects of the sampling intervals and separation process of oil-water two phases on mass transfer performance, one new testing method is established by manufacturing the novel oil-water separator based on the principle of siphon. For the conditions applied during the study, the overall volumetric mean mass transfer coefficients range from 0.19 to 11.96 s(-1), which are one or three orders of magnitude higher than those in typical conventional large scaled contactors. (C) 2009 Elsevier Ltd. All rights reserved.
关键词[WOS]: LIQUID SLUG-FLOW ;  CAPILLARY-MICROREACTOR ;  HEAT-TRANSFER ;  REACTOR ;  INTENSIFICATION ;  CONTACTORS ;  PATTERNS
语种: 英语
WOS记录号: WOS:000275588500006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141651
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 Natl Lab Clean Energy, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Zhao, Yuchao,Su, Yuanhai,Chen, Guangwen,et al. Effect of surface properties on the flow characteristics and mass transfer performance in microchannels[J]. CHEMICAL ENGINEERING SCIENCE,2010,65(5):1563-1570.
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