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题名: An experimental study of air-water Taylor flow and mass transfer inside square microchannels
作者: Yue, Jun1, 2;  Luo, Lingai1;  Gonthier, Yves1;  Chen, Guangwen2;  Yuan, Quan2
关键词: Microchannel ;  Taylor flow ;  Bubble ;  Hydrodynamics ;  Mass transfer ;  Multiphase reactors
刊名: CHEMICAL ENGINEERING SCIENCE
发表日期: 2009-08-15
DOI: 10.1016/j.ces.2009.05.026
卷: 64, 期:16, 页:3697-3708
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: Flow and mass transfer properties under air-water Taylor flow have been investigated in two square microchannels with hydraulic diameters of 400 and 200 mu m. Experimental data on Taylor bubble velocity, pressure drop and liquid side volumetric mass transfer coefficient (k(L)a) have been presented. It was shown that the measured Taylor bubble velocity in square microchannels could be well interpreted based upon an approximate measurement of the liquid film profile therein. Then, the obtained two-phase frictional pressure drop values in both microchannels were found to be significantly higher than the predictions of the correlation proposed by Kreutzer et al. [2005b. Inertial and interfacial effects on pressure drop of Taylor flow in capillaries. A.I.Ch.E. journal 51, 2428-2440] when the liquid slug was very short, which can be explained by the inadequacy of their correlation to describe the excess pressure drop caused by the strong inner circulation in such short liquid slugs. An appropriate modification has been made to this correlation in order to improve its applicability in microchannels. Finally, the experimental (k(L)a) values in the microchannel with hydraulic diameter of 400 mu m were found to be in poor agreement with those predicted by the existing correlations proposed for capillaries with diameters of several millimeters. The observed deviation was mainly due to the fact that mass transfer experiments in this microchannel actually corresponded to the case of short film contact time and rather poor mixing between the liquid film and the liquid slug, which was not in accordance with mass transfer assumptions associated with these correlations. A new empirical correlation has been proposed to describe mass transfer data in this microchannel. (C) 2009 Elsevier Ltd. All rights reserved.
关键词[WOS]: LIQUID 2-PHASE FLOW ;  BUBBLE-TRAIN FLOW ;  MICROFABRICATED MULTIPHASE REACTORS ;  SELECTIVE DIRECT FLUORINATION ;  GAS-LIQUID ;  PRESSURE-DROP ;  RECTANGULAR MICROCHANNELS ;  LONG BUBBLES ;  POLYGONAL CAPILLARIES ;  ELEMENTAL FLUORINE
语种: 英语
WOS记录号: WOS:000271298600015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141441
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.Univ Savoie, LOCIE, F-73376 Savoie Technolac, Bourget Lac, France
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China

Recommended Citation:
Yue, Jun,Luo, Lingai,Gonthier, Yves,et al. An experimental study of air-water Taylor flow and mass transfer inside square microchannels[J]. CHEMICAL ENGINEERING SCIENCE,2009,64(16):3697-3708.
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