Bubble refinement by non-invasive rotating flow

Wang, Lianyu; Liu, Zeyi; Qi, Ji; He, Ming; Sano, Masamichi; Liu, Xiaoming; Zhao, Lijia; Wang, Qiang

doi:10.1016/j.ces.2021.116908

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…However, all enhancement methods above concentrated on the bubble formation phase and involved infinitely reducing the pore size to produce microbubbles, causing high breakthrough pressure to form microbubbles and gas pump operating costs. Although ultrasonication ( Wu et al, 2021a ; Wu et al, 2021b ; Qin et al, 2022 ), stirring ( Cheng et al, 2020 ; Naira et al, 2020 ; Wang et al, 2021a ), and turbulence ( Zhang et al, 2020 ; Wang et al, 2021b ; Reichmann et al, 2021 ) can improve the mass transfer coefficient at the gas-liquid interface during bubble rising by reducing bubble sizes and strengthening the interface disturbance, they involved high energy consumption. Adding surfactants can produce small bubbles without additional energy consumption; however, surfactants have recycling complications ( Li and Kang, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device

Zhang

Feng

et al. 2023

Front. Bioeng. Biotechnol.

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Introduction: Carbon sequestration by microalgae is an effective approach for achieving carbon neutrality owing to its high carbon capture efficiency and environmental friendliness. To improve microalgae CO2 fixation efficiency, various methods to enhance CO2 transfer at the gas-liquid interface have resulted in high energy consumption.Methods: In this study, a novel aeration device with bubble cutting slices was installed in a photobioreactor for CO2 supply, which could precisely separate bubbles into sizes on the way to rising after departure, achieving CO2 transfer enhancement without extra energy consumption. Subsequently, the bubble cutting dynamic behaviors in the photobioreactor were studied, and the effects of thickness, hydrophilicity, and arrangement of cutting slices on microalgal growth were analyzed.Results: It was found that bubble cutting caused the maximum dry weight and biomass productivity of microalgae to improve by 6.99% and 33.33%, respectively, compared with those of the bioreactor without cutting units, owing to a 27.97% and 46.88% decrease in bubble size and rising velocity, respectively, and an 84.55% prolongation of bubble residence time.Discussion: Parallel cut slices with a thickness and spacing of less than 3 mm successfully cut the bubbles. The hydrophobic slice surface prevented daughter bubble departure and prolonged the bubble residence time, impeding microalgae growth owing to bubble coalescence with subsequent bubbles. The optimal cutting slice parameters and culture conditions for microalgal growth were 1 mm slice thickness, less than 1 mm slice spacing, 5% inlet CO2 concentration, and 70 mL/min gas flow rate.

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Section: Introductionmentioning

confidence: 99%

Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device

Zhang

Feng

et al. 2023

Front. Bioeng. Biotechnol.

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Non-contact Bubble Refinement in Metallurgical Melt by the Forward–Reverse Rotating Electromagnetic Field

Wang

Liu

et al. 2022

Metall Mater Trans B

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Vibrations Analysis of Bubble Evolution in Liquids of Varying Physical Properties

Rigas,

Willers,

Eckert

et al. 2023

Metall Mater Trans B

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In recent years there is an attempt to control the gas stirring intensity in metal-making ladles with the aid of vibration measurements. Understanding better the induced vibrations in two-phase flows can substantially improve the existing models for gas stirring control. In this work, highly sensitive accelerometers were used for the vibration measurements in a liquid metal alloy; Sn–40 wt pctBi alloy at 200 °C and water at 20 °C. The examination of the liquids was conducted in the ladle mockup integrated into the Liquid Metal Model for Steel Casting facility at Helmholtz-Zentrum Dresden Rossendorf. Single bubbles were generated in the respective liquids by controlled argon injection at low flow rates in the range of 0.01 to 0.15 NL min−1 through a single nozzle installed at the bottom of the ladle. Obtained results demonstrate differences between the induced vibrations in the examined liquids in terms of the magnitude of the root mean square values of vibration amplitude and the shape of the resulting curves with increasing flow rate. Furthermore, continuous wavelet transform reveals variations in the duration and vibrational frequency of the evolved bubble phenomena. The findings suggest that differences in the physical properties of the examined liquids result in variations in the vibrations induced during bubble evolution.

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Bubble refinement by non-invasive rotating flow

Cited by 5 publications

References 41 publications

Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device

Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device

Non-contact Bubble Refinement in Metallurgical Melt by the Forward–Reverse Rotating Electromagnetic Field

Vibrations Analysis of Bubble Evolution in Liquids of Varying Physical Properties

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