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Pulsatory rise of microbubble swarm along a vertical wall

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57102

Title: Pulsatory rise of microbubble swarm along a vertical wall
Authors: Kitagawa, Atsuhide Browse this author
Murai, Yuichi Browse this author →KAKEN DB
Keywords: Microbubble
Bubble swarm
Multiphase flow
Particle tracking velocimetry
Issue Date: 6-Sep-2014
Publisher: Elsevier
Journal Title: Chemical Engineering Science
Volume: 116
Start Page: 694
End Page: 703
Publisher DOI: 10.1016/j.ces.2014.06.001
Abstract: Based on the experimental finding that microbubble swarms dramatically promote heat transfer from a vertical heated wall, despite their potentially adiabatic nature, tests of microbubble fluid mechanics in the isothermal state are performed to clarify the unique motion characteristics of microbubble swarms. At constant bubble flow rate, the microbubble swarm shows a significant pulsatory rise along a vertical flat wall, particularly for small bubbles. Particle tracking velocimetry applied to the microbubbles shows that a two-way interaction between the microbubbles and the liquid flow self-excites the pulsation during their co-current rise. The sequence consists of the following processes: (i) increase in the bubble number density close to the wall as a result of the liquid velocity gradient driven by the microbubbles themselves; (ii) wave generation inside the microbubble swarm to induce the pulsatory rise of the swarm; and (iii) amplification of the waves, which results in void-bursting motion in the final stage.
Type: article (author version)
URI: http://hdl.handle.net/2115/57102
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 村井 祐一

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