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Experimental study on breakup mechanism of microbubble in 2D channel
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Document Title
Experimental study on breakup mechanism of microbubble in 2D channel
Author
Lee C.H., Wongwises S., Jerng D.-W., Ahn H.S.
Name from Authors Collection
Affiliations
Department of Mechanical Engineering, Incheon National University, Incheon, South Korea; Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangkok, Thailand; National Science and Technology Development Agency (NSTDA)Pathum Thani 12120, Thailand; School of Energy Systems Engineering, Chung Ang University, Seoul, South Korea; Nuclear Safety Research Institute, Incheon National University, Incheon, South Korea; AHN Materials INC, Incheon, South Korea
Type
Article
Source Title
Case Studies in Thermal Engineering
ISSN
2214157X
Year
2021
Volume
28
Open Access
Gold
Publisher
Elsevier Ltd
DOI
10.1016/j.csite.2021.101523
Format
Abstract
The breakup mechanism of a microbubble in a 2D channel, was studied through visualization experiments. A venturi-shaped nozzle made with a 3D printer in a 2D channel was employed, and the pressure data and visualization images were analyzed. It is compared that he bubble behavior and size distribution according to the change in the rear-end exit angle of the venturi-shaped nozzle. As the exit angle increased, the bubble size decreased. However, it was confirmed that wake flow was formed in the venturi channel with an exit angle above 20°. By analyzing the visualization, we confirmed that the air bubbles interacted with the central flow and split into pieces. To maximize this process, a flare-shaped diffuser was designed and evaluated. The bubble breakup performance of the flared diffuser was better than that of the linear exit angle, in terms of the bubble size. It was a flared diffuser that satisfied the conditions for maximizing the bubble breakup process in a water flow rate of (35 L/min) and an air flow rate (0.1 L/MIN) experiments. Based on the results, it is expected that the limitations of the venturi-shaped microbubble generator can be overcome. © 2021 The Authors
Keyword
2D channel | Break-up mechanism | Bubble visualization | Microbubble | Venturi nozzle
Funding Sponsor
National Science and Technology Development Agency; Thailand Science Research and Innovation
License
CC BY or CC BY-NC-ND
Rights
Elsevier B.V.
Publication Source
Scopus
Note
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