Effects of the Microbubble Generation Mode on Hydrodynamic Parameters in Gas–Liquid Bubble Columns

Ning, Shanglei; Jin, Haibo; He, Guangping; Ma, Lu‐Fang; Guo, Xiaoyan; Zhang, Rongyue

doi:10.3390/pr8060663

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…The microbubbles have been widely applied in fields such as mineral flotation, bubble column, air-injected deoiling hydrocyclone, and wastewater treatment due to their small size, long residence time, large specific surface area, and high mass transfer efficiency. So far, various microbubble generators have been developed, such as spiral liquid flow type, venturi type, ejector type, pressurized dissolution type, porous membrane type, ultrasonic type, and electrolytic type .…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Microbubble Dispersion Process Intensification Using Novel Internal Baffles

Chen

Song

2022

Ind. Eng. Chem. Res.

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“…Bubble column reactors have been widely used in petrochemical, chemical, biochemical, and pharmaceutical industries [1][2][3] , with the advantages of a simple construction, no mechanically moving parts, good mass transfer properties, high thermal stability, low energy supply, and low operation costs [4][5][6] . The characteristics of the bubble are the most important parameters in the bubble column; they can be used to estimate the average residence time of bubbles and the contact area of the gas and liquid phases to determine the mass transfer intensity and the reaction rate of the column.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Air-Acetic Acid Solution Gas-Liquid Two Phase in a Bubble Column

Zhang¹,

Ning²,

Jin³

et al. 2020

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The hydrodynamic behavior of the air-acetic acid system in a bubble column is studied using a differential pressure transmitter, double probe optical fiber probe, and the electrical resistance tomography (ERT) technique. The superficial gas velocity ranges from 0.016 to 0.094 m/s under ambient temperature and pressure. The influences of viscosity and surface tension on gas holdup, bubble rising velocity, and bubble chord distribution in the column are discussed with different mass fractions of an acetic acid solution. The results show that as the mass fraction of acetic acid increases, the surface tension of the liquid phase decreases, and the viscosity first increases and then decreases. This causes the gas holdup in the column to first increase and then decrease, and reaches the maximum value at an acetic acid mass fraction of 55% to 60%. The rising velocity of the bubbles in the column is high in the central region and has a low-value distribution near the wall. The bubble chord length distribution is concentrated, and the distribution of the bubble chord length in the column becomes narrow with any decrease in surface tension. Studying the hydrodynamic behavior of a bubble column with the air-acid system is of great significance considering the absence of data on air-organic acid systems.

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“…Ning et al (2020) used a sintered plate and foam gun as microbubble generators to analyze the foam hydrodynamics in a bubble column. They found that the foam gun can provide a narrower average bubble chord length and a higher gas holdup during gas distribution [14]. Ehyaei et al (2020) developed a mathematical model to simulate a geothermal plant as a renewable energy resource by implementing an organic Rankine cycle (ORC) coupled with a genetic algorithm.…”

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confidence: 99%