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Experimental and Computational Multiphase Flow 2019, 1(3): 177-185 https://doi.org/10.1007/s42757-019-0018-x
Research Article | Issue | Published: 05 September 2019

A visualized study of bubble breakup in small rectangular Venturi channels

Show Author's Information Jiang Huang,  Licheng Sun( ),  Zhengyu Mo( ),  Hongtao Liu,  Min Du,  Jiguo Tang,  Jingjing Bao
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu, China
Keywords:
Venturi channel, bubble breakup, deceleration, jet flow, visualized study
Cite this article:
Huang J, Sun L, Mo Z, et al. A visualized study of bubble breakup in small rectangular Venturi channels. Experimental and Computational Multiphase Flow, 2019, 1(3): 177-185. https://doi.org/10.1007/s42757-019-0018-x
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Abstract Full text About this article

Venturi channels taken as bubble generators own merits of simplicity in structure, high efficiency, and high reliability. A visualized investigation was carried out on bubble transportation and breakup in two small rectangular Venturi channels with the throat sizes of 1 mm × 1 mm and 1 mm × 2 mm, respectively. Experiments were conducted under ambient conditions with air and water as the working fluids. The experimental results indicate that bubble transportation and breakup in the Venturi channel with the throat size of 1 mm × 1 mm presents some different features compared with the other one: under the same average liquid velocity in the throat, bubbles own higher initial velocity than the average liquid velocity before entering the diverging section, and remain this trend till they are split; a binary breakup occurs to the bubbles prior to their final collapse in the recirculation region due to the jet flow in the backward of the bubbles. The bubble transportation and breakup in the Venturi channel with the throat size of 1 mm × 2 mm shows similar characteristics with that in a conventional Venturi channel. Overall, Venturi with smaller size presents a better performance in producing fine bubbles.


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About this article

A visualized study of bubble breakup in small rectangular Venturi channels

Show Author's information Jiang Huang, Licheng Sun( ), Zhengyu Mo( ), Hongtao Liu, Min Du, Jiguo Tang, Jingjing Bao
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu, China

Abstract

Venturi channels taken as bubble generators own merits of simplicity in structure, high efficiency, and high reliability. A visualized investigation was carried out on bubble transportation and breakup in two small rectangular Venturi channels with the throat sizes of 1 mm × 1 mm and 1 mm × 2 mm, respectively. Experiments were conducted under ambient conditions with air and water as the working fluids. The experimental results indicate that bubble transportation and breakup in the Venturi channel with the throat size of 1 mm × 1 mm presents some different features compared with the other one: under the same average liquid velocity in the throat, bubbles own higher initial velocity than the average liquid velocity before entering the diverging section, and remain this trend till they are split; a binary breakup occurs to the bubbles prior to their final collapse in the recirculation region due to the jet flow in the backward of the bubbles. The bubble transportation and breakup in the Venturi channel with the throat size of 1 mm × 2 mm shows similar characteristics with that in a conventional Venturi channel. Overall, Venturi with smaller size presents a better performance in producing fine bubbles.

Keywords: Venturi channel, bubble breakup, deceleration, jet flow, visualized study

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Publication history
Copyright
Acknowledgements

Publication history

Received: 25 February 2019
Revised: 26 March 2019
Accepted: 26 March 2019
Published: 05 September 2019
Issue date: September 2019

Copyright

© Tsinghua University Press 2019

Acknowledgements

The authors are profoundly grateful to the financial supports of the National Natural Science Foundation of China (Grant Nos. 51709191, 51706149, and 51506099).

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