Effects of the wake flow on bubble patterns downstream of a cylindrical nozzle

Kang, Can; Zhang, Wei; Mao, Ning

doi:10.1016/j.cherd.2019.03.005

Cited by 10 publications

(4 citation statements)

References 45 publications

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“…Gas-liquid two-phase reactions are very common in industrial processes, such as chemical engineering, energy, and wastewater treatment. For such reaction, studying bubble detection methods is of great significance for obtaining the changes in the gasliquid interface [1] [2]. Industrial sealed containers are a common type of gas storage equipment, such as natural gas storage tanks, oxygen cylinders, etc.…”

Section: A Problem Significancementioning

confidence: 99%

Research on Bubble Detection Based on Improved YOLOv8n

Chen,

Zeng

2024

IEEE Access

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Bubble detection has important applications in industries such as tightness testing, fluid measurement, healthcare, and chemical engineering. Due to the fact that bubbles belong to small targets with characteristics such as reflection and shadows, they have fewer available features and are highly susceptible to environmental interference, which makes it difficult for detection models to accurately locate and recognize the bubbles. Aiming at these problems, an improved YOLOv8n for bubble detection is proposed. Firstly, the deformable convolution network (DCN) is used in the Backbone module to take place of the original C2f module, which enables the model to have stronger feature extraction and adaptive generalization capabilities for small targets with different deformations. Then the global attention mechanism (GAM) is introduced into Neck network to locally enhance the channels or regions of interest, which is beneficial for capturing the important features of targets, especially small targets like bubbles. Finally, the loss function is improved so that boundary box regression and target detection become more accurate. Experiments are conducted on the bubble dataset, and the results indicate the mean average precision (mAP) of the improved algorithm reaches 97.4%, increasing by 2.2% compared to the original YOLOv8n.This shows the proposed method has better comprehensive performance on bubble detection.

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Section: A Problem Significancementioning

confidence: 99%

Research on Bubble Detection Based on Improved YOLOv8n

Chen,

Zeng

2024

IEEE Access

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“…Bo et al [12] discovered that the distance between bubbles in still water affects bubble rise, and the greater the gas flow rate, the smaller the bubble spacing. Kang et al [13] used an experimental method to study the upward motion of bubbles and discovered that as the gas flow rate increased, the bubble size decreased. Iwata et al [14] found experimentally that increasing viscous force decreases the bubble velocity and tends to flatten the shape.…”

Section: Introductionmentioning

confidence: 99%

Effect of bubble size and spatial distribution on the flow and mixing of steel

Zhu

et al. 2023

Ironmaking & Steelmaking

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The size and spatial distribution of the argon bubbles have a significant impact on the refining effect when refining steel by blowing argon gas. Based on the VOF model, this paper simulated the rising behaviour of incipient bubbles in steel during ladle argon blowing. The effects of the bubble rising trajectory, velocity, offset coefficient, and active zone coefficient for steel on the effect of steel mixing were analysed. It was found that when the distance between the two incipient bubbles in the horizontal direction is greater than four bubble diameters, it will produce the best stirring effect. Moreover, when the same amount of argon gas generates several small bubbles, it provides more stirring power to the steel than when a single large bubble of equal volume is generated, and the stirring effect is superior.

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“…5 Providing small bubbles in liquid can effectively increase the interface area and thus improve the mass and energy transfer of the systems. The traditional method for generating small bubbles in liquids relies mainly on the shearing of the gases by liquid flow, such as micro-flow shearing in the microchannel, 6 cross-flow in the water tunnel, 7 and centrifugal shearing of rotating machinery. 8 Nevertheless, these methods universally suffer from high energy consumption and limited bubble size reduction in practical application.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Bubble Dispersion Characteristics in a Nonuniform Electric Field

Zhang

Wang

et al. 2022

Ind. Eng. Chem. Res.

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The application of electric fields can intensify the dispersion characteristics of discrete phase in continuous phase. In charged liquid–gas dispersion systems, there are important processes, such as bubble formation, motion, and interaction, which are quite different from hydrodynamic processes without external fields. In the present study, the bubble dispersion characteristics were experimentally studied in ethanol under a direct current (DC) nonuniform electric field. By considering the voltage and flow rate, the dispersion pattern, trajectory, size distribution, velocity, and deformation of the bubbles were examined using high-speed photography. A considerable control over the bubble dispersion patterns, including isolated, chain, and diffusion patterns, can be achieved by careful consideration of the experimental parameters. The bubbles dispersion in liquid under the electric field can detach with a considerably smaller diameter than that without electric field. Both the increase in electrical Bond number (Bo E) and gas Reynolds number (Re g) intensifies the interaction between bubbles. The Bo E works to accelerate the separation of smaller bubbles, while the Re g works to reinforce the wake induction. In addition, the cross-sectional bubble size distributions, velocities, and bubble shapes corresponded to the bubble dispersion patterns.

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Effects of the wake flow on bubble patterns downstream of a cylindrical nozzle

Cited by 10 publications

References 45 publications

Research on Bubble Detection Based on Improved YOLOv8n

Research on Bubble Detection Based on Improved YOLOv8n

Effect of bubble size and spatial distribution on the flow and mixing of steel

Experimental Study of Bubble Dispersion Characteristics in a Nonuniform Electric Field

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