Micro-nano bubbles production using a swirling-type venturi bubble generator

Wu, Mian; Yuan, Shiyan; Song, Haoyuan; Li, Xiaobing

doi:10.1016/j.cep.2021.108697

Cited by 32 publications

(16 citation statements)

References 27 publications

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“…99 (10) where C n is the constant. d 50 and d ave are much smaller than d 32 and d 99 , and d 50 is slightly smaller than d ave , illustrating that the BSD of bubbles fits well with a log-normal distribution.…”

Section: Effect Of Operating Conditions On Thementioning

confidence: 99%

“…Many methods have been developed to generate microbubbles . The venturi-type and membrane-type microbubble generators have been widely used due to their high efficiency and stability. , Feng et al have designed and manufactured several venturi microbubble generators through the three-dimensional (3D) printing technology. The gas–liquid volume flow rate ratio (G/L) was in the range of 0.01–0.2, and the Sauter mean diameter ( d 32 ) of the microbubbles was in the range of 0.23–0.60 mm.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

HiGee Microbubble Generator: (II) Controllable Preparation of Microbubbles

Jiang

Wang

Liao

et al. 2022

Ind. Eng. Chem. Res.

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Microbubbles can significantly intensify the gas–liquid mass transfer process. With the current bubble generators, it is difficult to achieve the controllable preparation of microbubbles with gas–liquid volume flow rate ratios greater than 0.5, which limits the applications of the microbubble technology. In our manuscript (I), a HiGee microbubble generator (HMG) has been developed with a variable energy dissipation rate. In this work, the HMG was first employed to produce microbubbles. Under the experimental conditions, the Sauter mean diameter (d 32) of the microbubbles was 100–300 μm and could be easily adjusted by the rotational speed. The deviations between the d 32 calculated by the energy dissipation rate model established in manuscript (I) and the experimental values were within ±10%, demonstrating the reliability of the energy dissipation rate model of HMG. Compared with other bubble generators, HMG is proved to be an excellent generator to produce controllable microbubbles, especially for relatively high gas–liquid volume flow rate ratio processes.

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Section: Effect Of Operating Conditions On Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

HiGee Microbubble Generator: (II) Controllable Preparation of Microbubbles

Jiang

Wang

Liao

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Therefore, the sizes of all bubbles were manually measured through the ImageJ software. The manual measuring method to obtain the bubble size and distribution information was also reported in some literature. , Here, each bubble was regarded as an ellipse shape, and the long and short axes were both measured. The bubble diameter was defined as the arithmetic mean value of them .…”

Section: Modeling and Simulationsmentioning

confidence: 99%

“…A swirl flow microbubble generator uses tangential liquid inlets 5 or a helical structure 11 to form a swirl flow. The typical swirl flow microbubble generator consists of a vortex chamber and nozzle.…”

Section: Introductionmentioning

confidence: 99%

“…The larger the turbulent dissipation rate, the smaller the maximum stable bubble diameter . Wu et al added fan-shaped structures at the entrance of the venturi tube and replaced the converging section with the spiral channel, improving the fluid turbulence level. The optimized device can generate the mean bubble size of approximately 1.74 μm, 2 orders of magnitude smaller than the traditional venturi type bubble generator at the liquid flow rate of 240 L/h, the air flow rate of 150 L/h, and the aeration time of 1 h. In wastewater treatment, the swirl flow microbubble generator has a higher oxygen mass transfer coefficient than other microbubble generators at a superficial gas velocity of less than 0.001 m/s .…”

Section: Introductionmentioning

confidence: 99%

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Microbubble Dispersion Process Intensification Using Novel Internal Baffles

Chen

Song

2022

Ind. Eng. Chem. Res.

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A bubble generator is a crucial component in the flotation system, and the bubble size is directly related to bubble mineralization. This paper focused on the microbubble size control of a swirl flow microbubble generator. The computational fluid dynamics coupled population balance model (CFD-PBM) was developed to evaluate the flow characteristic and the bubble generation performance of the microbubble generator with five novel internal baffles. The results showed that the baffle could improve the bubble dispersion without extra energy loss, and the single helical baffle could generate tiny bubbles with a Sauter mean diameter of 0.36 mm at a liquid flow rate of 2000 L/h. The baffle could limit the positive axial velocity and hinder the tangential velocity effect in the straight pipe section, weakening the swirl flow effect. Hence, although the baffle slightly reduced the pressure gradient magnitude and the turbulent intensity, it still presented an effective improvement in the bubble dispersion.

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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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Micro-nano bubbles production using a swirling-type venturi bubble generator

Cited by 32 publications

References 27 publications

HiGee Microbubble Generator: (II) Controllable Preparation of Microbubbles

HiGee Microbubble Generator: (II) Controllable Preparation of Microbubbles

Microbubble Dispersion Process Intensification Using Novel Internal Baffles

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

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