An investigation on bubble motion in liquid flowing through a rectangular Venturi channel

Zhao, Liang; Sun, Licheng; Mo, Zhengyu; Tang, Jiguo; Hu, Liuyun; Bao, Jianjun

doi:10.1016/j.expthermflusci.2018.04.009

Cited by 38 publications

(26 citation statements)

References 36 publications

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“…Van der Geld et al (2001) derived the parameters C 1 and C 2 of 1.2 and 0.9, respectively, which were higher than the numerical results (C 1 = 0.25, C 2 = 0.55) obtained by Magnaudet et al (1995). Zhao et al (2018) estimated the values of various forces acting on individual bubbles undergoing deceleration in the divergent section of Venturi channel. Only the forces along the main flow direction (x-direction) were taken into account, including pressure gradient force, added mass force, and drag force.…”

Section: Theoretical Analysis and Numerical Simulationmentioning

confidence: 70%

“…In visual experiments, the bubble transportation processes in Venturi channels are usually recorded by a high-speed camera, from which parameters including bubble size, shape, trajectory, and velocity can be obtained for further analysis. Zhao et al (2017Zhao et al ( , 2018 conducted visualized experiments to investigate motions of individual bubbles in rectangular Venturi channels. They found that bubbles underwent a dramatic deformation and rapid deceleration in the divergent section.…”

Section: Phenomenological Observation In Experimentsmentioning

confidence: 99%

“…In a certain range of divergent angles and liquid Reynolds numbers, recirculation flow regions caused by flow separation occurs in the divergent section (Sparrow et al, 2009). The recirculation flow hinders the bubbles or slugs from moving forward once they are discharged from the throat, leading to a deceleration and accumulation of the bubbles or slugs in the diverging section, in return resulting in more intensified interaction between the gas and the liquid (Huang et al, 2018;Zhao et al, 2018). The interaction between the bubbles and liquid is significantly intensified and consequently bubbles collapse intensively in the recirculation flow region.…”

Section: Theoretical Analysis and Numerical Simulationmentioning

confidence: 99%

“…In practical applications, Venturi structure can apply to short contact time and high intensity gas-liquid reactions, and usually takes the two forms. One is the abovementioned conventional Venturi (Gabbard, 1972;Fujiwara et al, 2007;Sun et al, 2017;Zhao et al, 2018), with which the introduced gas bubbles or cavitation bubbles are well-broken into finely dispersed bubbles in the divergent section. The other is jet-Venturi or Venturi ejector (Jackson, 1964;Kandakure et al, 2005;Balamurugan et al, 2007;Sharma et al, 2018), mainly consisting of a throat and a diverging section.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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Venturi-type bubble generators own advantages of simplicity in structure, high efficiency, low power consumption, and high reliability, exhibiting a broad application potential in various fields. This work presents a literature review of recent progress in the research concerning Venturi-type bubble generators, with a focus on the performance evaluation, bubble transportation, and breakup mechanisms. Experimental studies employing flow visualization techniques have played an important role in exploring the bubble transportation and breakup phenomena, which is vitally necessary for clarifying the bubble breakup mechanisms and understanding the working principle and performance of a Venturi channel as a bubble generator. A summarization was carried out on both experimental and theoretical work concerning parameters influencing the bubble breakup and the performance of Venturi-type bubble generators. Based on the geometric parameter optimization combined with appropriate flow conditions, it is expected that Venturi-type bubble generators can produce bubbles with controllable size and concentration to satisfy the application requirements, while a further work is required to illustrate the interaction between the liquid and gas bubbles.

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Section: Theoretical Analysis and Numerical Simulationmentioning

confidence: 70%

Section: Phenomenological Observation In Experimentsmentioning

confidence: 99%

Section: Theoretical Analysis and Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

Self Cite

View full text Add to dashboard Cite

show abstract

“…It takes advantage of hydraulic process to generate bubbles. In recent years, the Venturi structures taken as bubble generators have been widely researched and applied (Fujiwara et al, 2003;Nomura et al, 2011;Sun et al, 2017;Zhao et al, 2017Zhao et al, , 2018Huang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A visualized study of bubble breakup in small rectangular Venturi channels

Huang

Sun

et al. 2019

Exp. Comput. Multiph. Flow

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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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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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An investigation on bubble motion in liquid flowing through a rectangular Venturi channel

Cited by 38 publications

References 36 publications

A review on bubble generation and transportation in Venturi-type bubble generators

A review on bubble generation and transportation in Venturi-type bubble generators

A visualized study of bubble breakup in small rectangular Venturi channels

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

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