Estimation of bubble size distributions and shapes in two-phase bubble column using image analysis and optical probes

Besagni, Giorgio; Brazzale, Pietro; Fiocca, Alberto; Inzoli, Fabio

doi:10.1016/j.flowmeasinst.2016.10.008

Cited by 87 publications

(50 citation statements)

References 61 publications

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“…[219][220][221]): Eo [222,223], We [223][224][225], Tadaki number [217,226], the Mo and the Eo numbers [227] and the Re and the Eo numbers [228]. Unfortunately, most of these correlations were developed for single bubbles/drops, and they may not be suitable for dense bubbly flows, as discussed by Besagni et al [11,53,229]. To this end, Besagni et al [12,229] proposed a correlation for the bubble aspect ratio (E) for dense bubbly flows which reads as follows:…”

Section: The Bubble Size Distribution and Shapesmentioning

confidence: 99%

“…This change in the distribution of bubble size has been justified by increased coalescence [242] or break-up [244]. Besagni and Inzoli [46,52,53,229] described the BSDs in a polydispersed homogeneous flow regime in the batch and counter-current modes. The changes in the BSD (from bimodal to unimodal) in the counter-current mode were based on the force pushing the small bubbles toward the center of the pipe.…”

Section: Superficial Gas Velocitymentioning

confidence: 99%

“…For example, Figures 25-27 present the experimental findings of the relationships between E and the gas and liquid superficial velocities, obtained by the PoliMi and HZDR research groups (see, for example, refs. [7,12,46,53,[229][230][231][249][250][251]). These experimental findings concern air-water flow; experimental results concerning other working fluids are summarized in ref.…”

Section: Superficial Gas Velocitymentioning

confidence: 99%

“…Different methods have been presented over the last few decades, as discussed by Shaikh and Al-Dahhan [102], Nedeltchev and Shaikh [26] and Nedeltchev [27]. The most common methods employed are statistical methods (by interpretation of the ε G -U G curve), the swarm velocity [7,11,34,46,[51][52][53]75,76,89,91,229,315,316] and the drift flux [7,11,34,38,46,51,53,75,76,229,[316][317][318] approaches. These methods are based on the analysis of ε G data.…”

Section: The Flow Regimesmentioning

confidence: 99%

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Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: The Bubble Size Distribution and Shapesmentioning

confidence: 99%

Section: Superficial Gas Velocitymentioning

confidence: 99%

Section: Superficial Gas Velocitymentioning

confidence: 99%

Section: The Flow Regimesmentioning

confidence: 99%

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Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…At first glance, an increase in bubble size between the bottom and the top measurement ports is observed for the three cases as a result of the bubble decompression. The BSD was fitted in the literature for bubbly flow to normal [9], log-normal [10][11][12][13][14], or gamma [15,16] distributions. For the experiments in this paper, where relatively low superficial gas velocities are given, the bubble size data fitted well to a normal distribution.…”

Section: Bubble Size Distribution Measurementsmentioning

confidence: 99%

On the One-Dimensional Modeling of Vertical Upward Bubbly Flow

Peña-Monferrer

Gómez-Zarzuela

Chiva

et al. 2018

Science and Technology of Nuclear Installations

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The one-dimensional two-fluid model approach has been traditionally used in thermal-hydraulics codes for the analysis of transients and accidents in water-cooled nuclear power plants. This paper investigates the performance of RELAP5/MOD3 predicting vertical upward bubbly flow at low velocity conditions. For bubbly flow and vertical pipes, this code applies the driftvelocity approach, showing important discrepancies with the experiments compared. Then, we use a classical formulation of the drag coefficient approach to evaluate the performance of both approaches. This is based on the critical Weber criteria and includes several assumptions for the calculation of the interfacial area and bubble size that are evaluated in this work. A more accurate drag coefficient approach is proposed and implemented in RELAP5/MOD3. Instead of using the Weber criteria, the bubble size distribution is directly considered. This allows the calculation of the interfacial area directly from the definition of Sauter mean diameter of a distribution. The results show that only the proposed approach was able to predict all the flow characteristics, in particular the bubble size and interfacial area concentration. Finally, the computational results are analyzed and validated with cross-section area average measurements of void fraction, dispersed phase velocity, bubble size, and interfacial area concentration.

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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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Estimation of bubble size distributions and shapes in two-phase bubble column using image analysis and optical probes

Cited by 87 publications

References 61 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

On the One-Dimensional Modeling of Vertical Upward Bubbly Flow

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

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