Bubble breakup in a swirl-venturi microbubble generator

Wang, Xinyan; Shuai, Yun; Zhang, Haomiao; Sun, Jingyuan; Yang, Yao; Huang, Zhengliang; Jiang, Binbo; Yang, Yongrong

doi:10.1016/j.cej.2020.126397

Cited by 60 publications

(50 citation statements)

References 38 publications

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“…Finally, a cluster of daughter bubbles formed after a series of breakup. According to the pattern of this kind of breakup, it could be named as “dynamic erosive breakup” which was proposed in Wang et al 15 The formed daughter bubbles would flow into the external field. These bubbles can be identified as microbubbles.…”

Section: Resultsmentioning

confidence: 99%

“…In order to measure the microbubble generation energetic efficiency, referring to the definition of Wang et al, 15 the ratio of the daughter bubble volume to the mother volume termed as f V = ( D D / D M ) 3 is introduced as shown in Figure 18B. D D is the bubble diameter in the external region while D M is the diameter of the bubble that just enters the fluidic oscillator as shown in the red box in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…According to Huang et al, 4 Wang et al, 15 and Song et al, 31 the dynamics of bubbles are related to some significant flow parameters such as the turbulent kinetic energy k which could affect the breakup of bubbles significantly. In the following discussion, the turbulent kinetic energy k would be employed to explore the relationship between the liquid flow fields and the dynamics of the bubbles.…”

Section: Methodsmentioning

confidence: 99%

“…According to the special role of oscillations, it is speculated that microbubbles may also be produced steadily after the oscillating gas–liquid fluids away from one fluidic oscillator. In fact, Zhao et al, 13 Itoh et al, 14 and Wang et al 15 discussed the microbubble generation by injecting gas–liquid fluids into one venturi‐type generator.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microbubble generation driven by the oscillation in a self‐excited fluidic oscillator

et al. 2021

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The oscillation‐driven microbubble generation in a self‐excited fluidic oscillator is explored in this work. By investigating the behaviors of bubbles, it is noted that for relatively low liquid flow rate, bubbles move upward directly and breakup does not occur inside the chamber region. Interestingly, the existence of bubbles could destroy the structure of flow field and even affect the oscillation. Nevertheless, for relatively high liquid flow rate, the bubbles would not be able to change the flow field structure of liquid phase effectually. Meanwhile, binary, shear‐off‐induced and a kind of dynamic erosive breakup of the bubbles could occur for the effects of oscillations of liquid main jet. Abundant microbubbles could be produced mainly by the dynamic erosive breakup. The oscillation is only induced by the Coanda effect without any moving parts. Nevertheless, it is able to supply a robust oscillating turbulent field to enhance the breakup of bubbles dramatically.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microbubble generation driven by the oscillation in a self‐excited fluidic oscillator

et al. 2021

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“…They concluded that the venture pipe can efficiently produce small bubbles below a certain gas-to-liquid flow rates ratio. Wang et al proposed several air inlets mounted tangentially to produce swirling two-phase flow and enable more break-up mechanisms under higher gas-liquid ratios [19]. Nevertheless, the typical Venturi tubes with minor modifications experience a high pressure drop and the effective gas aspiration rate is rather limited.…”

Section: The Daf Sparger Designmentioning

confidence: 99%

Auto-Aspirated DAF Sparger Study on Flow Hydrodynamics, Bubble Generation and Aeration Efficiency

et al. 2020

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A novel auto-aspirated sparger is examined experimentally in a closed-loop reactor (CLR) at lab scale using particle image velocimetry, high-speed camera and oxygen mass transfer rate measurements. State-of-the-art 3D printing technology was utilized to develop the sparger design in stainless steel. An insignificant change in the bubble size distribution was observed along the aerated flow, proving the existence of a low coalescence rate in the constraint domain of the CLR pipeline. The studied sparger created macrobubbles evenly dispersed in space. In pure water, the produced bubble size distribution from 190 to 2500 μm is controlled by liquid flow rate. The bubble size dynamics exhibited a power-law function of water flow rate approaching a stable minimum bubble size, which was attributed to the ratio of the fast-growing energy of the bubble surface tension over the kinetic energy of the stream. Potentially, the stream energy can efficiently disperse higher gas flow rates. The oxygen transfer rate was rapid and depended on the water flow rate. The aeration efficiency below 0.4 kW/m3 was superior to the commonly used aerating apparatuses tested at lab scale. The efficient gas dissolution technology has potential in water treatment and carbon capture processes applications.

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A visualized investigation of bubble breakup in a swirl‐venturi bubble generator

Bie

Xue

et al. 2022

AIChE Journal

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The dynamics and breakup of bubbles in swirl-venturi bubble generator (SVBG) are explored in this work. The three-dimensional movement process and breakup phenomena of bubbles are captured by one high-speed camera system with two cameras while the distribution of swirling flow field is recorded through Particle Image Velocimetry technology. It is revealed that bubbles have two motion trajectories, which are deeply related to bubble breakup. One trajectory is that mother bubble moves upward in an axial direction of the SVBG to the diverging section, and the other trajectory is that mother bubble rotates obliquely upward to another side-wall along the radial direction. Meanwhile, binary breakup, shear-off-induced breakup, static erosive breakup, and dynamic erosive breakup are observed. For relatively high liquid Reynolds number, vortex flow regions are extended and the bubble size is reduced. Furthermore, it is worth noting that the number of microbubbles increases significantly for intensive swirling flow.

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Bubble breakup in a swirl-venturi microbubble generator

Cited by 60 publications

References 38 publications

Microbubble generation driven by the oscillation in a self‐excited fluidic oscillator

Microbubble generation driven by the oscillation in a self‐excited fluidic oscillator

Auto-Aspirated DAF Sparger Study on Flow Hydrodynamics, Bubble Generation and Aeration Efficiency

A visualized investigation of bubble breakup in a swirl‐venturi bubble generator

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