Dynamics of single bubbles rising in confined square and rectangular channels

Sirino, Thiago; Machado, Vitor; Mancilla, Ernesto; Morales, Rigoberto E. M.

doi:10.1016/j.ijmultiphaseflow.2022.104257

Cited by 5 publications

(2 citation statements)

References 57 publications

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“…20,21 In terms of experimental approaches, researchers can employ high-speed photography to capture bubble interactions with charge-coupled device (CCD) cameras at different shooting frame rates. 22,23 This method offers the advantages of direct visualization and cost-effectiveness. However, generating multiple bubbles at different locations and examining their coalescence and breakup remain considerable challenges, especially when trying to display flow behavior in a limited space.…”

Section: Introductionmentioning

confidence: 99%

“…Their research findings largely align with existing experimental data. , However, in actual industrial settings, bubbles often exist in groups or clusters rather than in isolation. Thus, conclusions drawn from single-bubble studies cannot be directly applied to multibubble systems. , Several factors, including the number of bubbles, their initial diameter, and spacing, significantly influence multibubble interactions. , In terms of experimental approaches, researchers can employ high-speed photography to capture bubble interactions with charge-coupled device (CCD) cameras at different shooting frame rates. , This method offers the advantages of direct visualization and cost-effectiveness. However, generating multiple bubbles at different locations and examining their coalescence and breakup remain considerable challenges, especially when trying to display flow behavior in a limited space.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Geometric Characteristics and Coalescence and Breakup Behavior during the Rise of Multiple Parallel Bubbles

Li,

Jiang,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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The characterization of multiple bubbles in gas−liquid two-phase flow is a critical yet unresolved issue in both science and industry. Utilizing the volume of fluid (VOF) numerical simulation technique and high-speed visualization of bubble flow, the coalescence and breakup behaviors among multiple bubbles were examined in detail for three, four, and five bubbles with different initial bubble diameters (4, 6, 8, and 10 mm) and different initial bubble spacings (0.8−16 mm), respectively. As the initial bubble diameter increased, the deformation trend of sub-bubbles after the coalescence of three bubbles diminished, the holding time of large bubbles and the size of breakup sub-bubbles increased after the coalescence of four bubbles, and the trend of secondary coalescence between sub-bubbles in five bubbles decreased. With the increase of initial bubble spacing, the interaction of the surrounding flow field and the effect of bubble wake weakened, reducing the trend of bubble coalescence. Differences in the number of bubbles can also have a marked effect on the way that the coalescence between bubbles behaves. This study compensates the gap of small number of bubbles in the field of multibubble coalescence, lays the foundation for predictability in the design of gas−liquid equipment, and deepens the understanding of the mechanism of bubble coalescence and interaction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Geometric Characteristics and Coalescence and Breakup Behavior during the Rise of Multiple Parallel Bubbles

Li,

Jiang,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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Intelligent classification of online wear particle in lubricating oil using optical direct imaging method and convolutional neural network for rotating machinery

Liu,

Zuo,

Bai

et al. 2023

Tribology International

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Numerical study of the geometric characteristics and kinetic behavior of single bubble rise processes in different liquids

2023

Physics of Fluids

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The characterization of single bubble in gas–liquid two phase flow is a critical yet unresolved issue in both science and industry. In this study, the volume-of-fluid (VOF) method is used to numerically simulate and experimentally investigate the effect of initial bubble diameter, liquid viscosity, and surface tension on bubble deformation and the internal flow field of the bubble in a pool of stationary liquid. The findings indicate that as liquid viscosity increases, the bubble's rising speed decreases, and the bubble tends to oscillate. The variation in bubble deformation ratio and the degree of fluctuation increase with the bubble's initial diameter and decrease with the viscosity of the liquid phase. Additionally, as the surface tension of the liquid decreases, the bubble becomes more prone to rupture, and the number of ruptures increases. The flow field inside the bubble can be classified into three categories: “double main vortex type,” “double main vortex type with separated vortex,” and “double main vortex type with scattered vortex.” The velocity reaches its maximum at the center of each vortex type, and the velocity at the interface varies as the bubble interface shape changes. This work lays the foundation for the study of the flow field inside the bubble and improves the predictability of gas–liquid equipment design.

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Dynamics of single bubbles rising in confined square and rectangular channels

Cited by 5 publications

References 57 publications

Numerical Study of Geometric Characteristics and Coalescence and Breakup Behavior during the Rise of Multiple Parallel Bubbles

Numerical Study of Geometric Characteristics and Coalescence and Breakup Behavior during the Rise of Multiple Parallel Bubbles

Intelligent classification of online wear particle in lubricating oil using optical direct imaging method and convolutional neural network for rotating machinery

Numerical study of the geometric characteristics and kinetic behavior of single bubble rise processes in different liquids

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