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Periodic bubble emission and. appearance of an ordered bubble sequence (train) during condensation in a single microchannel
Zhang, Wei1,2; Xu, Jinliang1; Thome, John R.3
2008-07-01
发表期刊INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷号51期号:13-14页码:3420-3433
摘要Condensation of steam in a single microchannel, silicon test section was investigated visually at low flow rates. The microchannel was rectangular in cross-section with a depth of 30 pm, a width of 800 mu m and a length of 5.0 mm, covered with a Pyrex glass to allow for visualization of the bubble formation process. By varying the cooling rate during condensation of the saturated water vapor, it was possible to control the shape, size and frequency of the bubbles formed. At low cooling rates using only natural air convection from the ambient environment, the flow pattern in the microchannel consisted of a nearly stable elongated bubble attached upstream (near the inlet) that pinched off into a train of elliptical bubbles downstream of the elongated bubble. It was observed that these elliptical bubbles were emitted periodically from the tip of the elongated bubble at a high frequency, with smaller size than the channel width. The shape of the emitted bubbles underwent modifications shortly after their generation until finally becoming a stable vertical ellipse, maintaining its shape and size as it flowed downstream at a constant speed. These periodically emitted elliptical bubbles thus formed an ordered bubble sequence (train). At higher cooling rates using chilled water in a copper heat sink attached to the test section, the bubble formation frequency increased significantly while the bubble size decreased, all the while forming a perfect bubble train flowing downstream of the microchannel. The emitted bubbles in this case immediately formed into a circular shape without any further modification after their separation from the elongated bubble upstream. The present study suggests that a method for controlling the size and generation frequency of microbubbles could be so developed, which may be of interest for microfluidic applications. The breakup of the elongated bubble is caused by the large Weber number at the tip of the elongated bubble induced by the maximum vapor velocity at the centerline of the microchannel inside the elongated bubble and the smaller surface tension force of water at the tip of the elongated bubble. (c) 2007 Elsevier Ltd. All rights reserved.
文章类型Article
关键词Condensation Microchannel Microfluidics Bubble Train
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.ijheatmasstransfer.2007.11.025
研究领域[WOS]Thermodynamics ; Engineering ; Mechanics
关键词[WOS]FILM CONDENSATION ; HEAT-TRANSFER ; CIRCULAR MICROCHANNELS ; HORIZONTAL MICROCHANNELS ; PRESSURE-DROP ; FLOW ; CHANNELS ; LIQUID ; MODEL ; TUBE
收录类别SCI
语种英语
WOS类目Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS记录号WOS:000257614800017
引用统计
被引频次:25[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/344007/10292
专题中国科学院广州能源研究所
作者单位1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Micro Energy Syst Lab, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
3.Ecole Polytech Fed Lausanne, Lab Heat & Mass Transfer, CH-1015 Lausanne, Switzerland
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Zhang, Wei,Xu, Jinliang,Thome, John R.. Periodic bubble emission and. appearance of an ordered bubble sequence (train) during condensation in a single microchannel[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2008,51(13-14):3420-3433.
APA Zhang, Wei,Xu, Jinliang,&Thome, John R..(2008).Periodic bubble emission and. appearance of an ordered bubble sequence (train) during condensation in a single microchannel.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,51(13-14),3420-3433.
MLA Zhang, Wei,et al."Periodic bubble emission and. appearance of an ordered bubble sequence (train) during condensation in a single microchannel".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 51.13-14(2008):3420-3433.
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