Bubble size distributions and shapes in annular gap bubble column

Besagni, Giorgio; Inzoli, Fabio

doi:10.1016/j.expthermflusci.2015.11.020

Cited by 119 publications

(99 citation statements)

References 80 publications

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“…Image analysis method for spherical/ellipsoidal bubbles. For sampling the spherical/ellipsoidal bubbles, we use the same approach that we have successfully applied to a large-diameter annular-gap bubble column Besagni and Inzoli, 2016b). In this approach, each bubble is approximated and reconstructed using an ellipse ( Fig.…”

Section: Image Analysis Methodsmentioning

confidence: 99%

“…The appearance of the first large bubble is responsible for this sudden increase in swarm velocity and is an indication of flow regime transition. This method has previously been employed by Krishna et al (1991), Letzel et al, (1997), Gourich et al, (2006), Ribeiro and Mewes (2007), Besagni et al (2014 and , 2016a, 2016b. In this study, the quantitative evaluation of U trans is determined by the intersection between the trends of U swarm in the two regimes.…”

Section: Flow Regime Transitionmentioning

confidence: 99%

“…Drift-flux method. The drift-flux method was proposed by Wallis (Wallis, 1969) and has been widely applied in the literature , 2016a, 2016bPassos et al, 2015;Ribeiro Jr and Mewes, 2007;Wallis, 1969). This method is based on the drift flux, which represents the gas flux through a surface moving with the speed of the two-phase mixture and is experimentally obtained as follows:…”

Section: Flow Regime Transitionmentioning

confidence: 99%

“…Image analysis has been mostly applied to rectangular/small-scale (Lau et al, 2013a(Lau et al, , 2013bZaruba et al, 2005) or medium scale (Schäfer et al, 2002) bubble columns, but there is a lack of studies concerning BSDs in largediameter bubble columns. Furthermore, studies analyzing the bubble size distributions near the sparger are uncommon (Hur et al, 2013), and the influence of the liquid velocity on the bubble shape and bubble size distribution is far from being understood (Besagni and Inzoli, 2016b). In the present study, we have applied a method based on human recognition of the bubble edge Besagni and Inzoli, 2016b).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, studies analyzing the bubble size distributions near the sparger are uncommon (Hur et al, 2013), and the influence of the liquid velocity on the bubble shape and bubble size distribution is far from being understood (Besagni and Inzoli, 2016b). In the present study, we have applied a method based on human recognition of the bubble edge Besagni and Inzoli, 2016b). This method was selected because, despite different image-processing algorithms that have been proposed, these techniques are still limited to resolve large bubble clusters, highly unsteady flows, and large void fractions (Karn et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

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Section: Image Analysis Methodsmentioning

confidence: 99%

Section: Flow Regime Transitionmentioning

confidence: 99%

Section: Flow Regime Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

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Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Gao

et al. 2019

AIChE Journal

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Multiphase flow hydrodynamics in a novel gas–liquid–solid jet‐loop reactor (JLR) were experimentally investigated at the macroscales and mesoscales. The chord length distribution was measured by an optical fiber probe and transformed for bubble size distribution through the maximum entropy method. The impacts of key operating conditions (superficial gas and liquid velocity, solid loading) on hydrodynamics at different axial and radial locations were comprehensively investigated. JLR was found to have good solid suspension ability owing to the internal circulation of bubbles and liquid flow. The gas holdup, axial liquid velocity, and bubble velocity increase with gas velocity, while liquid velocity has little influence on them. Compared with the gas–liquid JLRs, solids decrease the gas holdup and liquid circulation, reduces the bubble velocity and delays the flow development due to the enhanced interaction between bubbles and particles (Stokes number >1). This work also provides a benchmark data for computational fluid dynamics (CFD) model validation. © 2019 American Institute of Chemical Engineers AIChE J, 65: e16537, 2019

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Comparison of Eulerian QBMM and classical Eulerian–Eulerian method for the simulation of polydisperse bubbly flows

Marchisio

Hasse

et al. 2019

AIChE Journal

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The spatial gas distribution of poly-disperse bubbly flows depends greatly on the bubble size. To reflect the resulting polycelerity, more than two momentum balance equations (typically for the gas and liquid phases) have to be considered, as done in the multifluid approach. The inhomogeneous multiple-size group model follows this approach, also combined with a population balance model. As an alternative, in a previous work, an Eulerian quadrature-based moments method (E-QBMM) was implemented in OpenFOAM; however, only the drag force was included. In this work, different nondrag forces (lift, wall lubrication, and turbulent dispersion) are added to enable more complex test cases to be simulated. Simulation results obtained using E-QBMM are compared with the classical E-E method and validated against experimental data for different test cases. The results show that there is good agreement between E-QBMM and E-E methods for mono-disperse cases, but E-QBMM can better simulate the separation and segregation of small and large bubbles.

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Bubble size distributions and shapes in annular gap bubble column

Cited by 119 publications

References 80 publications

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Comparison of Eulerian QBMM and classical Eulerian–Eulerian method for the simulation of polydisperse bubbly flows

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