This paper describes the dynamic mechanisms of bubbles and droplets moving in quiescent flows. An improved diffuse interface method is adopted to capture the interfacial evolution of a two-phase flow, which can effectively suppress the phenomenon of interface dispersion. Preliminary simulations of a circular bubble/droplet moving from rest are first performed, and then, the interface shapes and vorticity distributions are compared to study the differences in the deformation mechanisms of bubbles and droplets. The processes of bubbles and droplets formed from a submerged orifice are, then, explored. The bubble formation process can be divided into nucleation, expansion, and detachment stages; for droplets, the characteristics of chaotic drip flow are considered. The interface shape and vorticity distribution of bubbles/droplets are analyzed, and the effects of the Weber number and Bond number on the detached bubble size and droplet flow regime are investigated. The effect of the contact angle on bubble formation is also examined. To reduce the detached bubble size, an improved method using an inserted orifice is proposed and confirmed. The inserted orifice is shown to have almost no effect on the formation of droplets, and the bubble/droplet formation and motion are independent of the inserted orifice length.
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Numerical investigation on formation and motion of bubble or droplet in quiescent flow
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March 2020
Research Article|
March 13 2020
Numerical investigation on formation and motion of bubble or droplet in quiescent flow

Tongwei Zhang (张童伟);
Tongwei Zhang (张童伟)
1
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
2
Key Laboratory of Unsteady Aerodynamics and Flow Control, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
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Jie Wu (吴杰)
;
Jie Wu (吴杰)
a)
1
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
2
Key Laboratory of Unsteady Aerodynamics and Flow Control, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
3
Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
4
Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center
, South Second Ring Road 6, Mianyang, Sichuan 621000, China
a)Author to whom correspondence should be addressed: wuj@nuaa.edu.cn
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Xingjian Lin (林星箭)
Xingjian Lin (林星箭)
1
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
2
Key Laboratory of Unsteady Aerodynamics and Flow Control, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics
, Yudao Street 29, Nanjing, Jiangsu 210016, China
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a)Author to whom correspondence should be addressed: wuj@nuaa.edu.cn
Note: This paper is part of the Special Topic, Papers Selected from the 8th International Symposium on Physics of Fluids.
Physics of Fluids 32, 032106 (2020)
Article history
Received:
December 19 2019
Accepted:
February 06 2020
Connected Content
A companion article has been published:
Difference between the dynamics of bubble and droplet formation
See also
Citation
Tongwei Zhang, Jie Wu, Xingjian Lin; Numerical investigation on formation and motion of bubble or droplet in quiescent flow. Physics of Fluids 1 March 2020; 32 (3): 032106. https://doi.org/10.1063/1.5143098
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