Multiphase turbulence in bubbly flows: RANS simulations

Colombo, Marco; Fairweather, Michael

doi:10.1016/j.ijmultiphaseflow.2015.09.003

Cited by 86 publications

(57 citation statements)

References 74 publications

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“…It is worth noting that suitable prediction and selection of inlet turbulent boundary conditions are needed for reliable predictions [448]. In this framework, models based on the RSM (Reynolds Stress Models) approach seem promising [449][450][451][452] for improving the numerical prediction of the turbulence quantities to be used as inputs for bubble coalescencence and break-up models. In addition, suitable models that take into account the bubble induced contribution should be selected and developed [453][454][455]; for example, recent studies aimed to calibrate this contribution based on DNS (Direct numerical simulations) studies [456].…”

Section: The Eulerian Multi-fluid Approachmentioning

confidence: 99%

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 Eulerian Multi-fluid Approachmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…Except for minor qualitative differences in terms of radial gas hold‐up, the overall hold‐up values were very similar. Colombo and Fairweather also applied the RSM and k ‐ ε models combined with bubble‐induced source terms to predict the hold‐up reported in previous experimental works. They concluded that the performance of different turbulence models was in fact comparable, and that best agreement between simulation and experiment was observed when experimentally‐determined values of the bubble diameter were used as input.…”

Section: Resultsmentioning

confidence: 99%

On the prediction of gas hold‐up in two‐phase flow systems using an Euler–Euler model

et al. 2020

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We quantify the ability of the two-fluid Euler-Euler model to predict the overall gas hold-up during two-phase flow in vertical columns using a combination of experiments and simulations. Gas hold-up in a bubble column and gas hold-up in the less-frequently studied co-current flow are investigated. For homogeneous flow characterized by nearly uniform bubble size, Euler-Euler model predictions are within 10% of the experimental values for both modes of operation, if the bubble diameter supplied as input to the model is the average bubble diameter in the physical system. This also holds true for heterogeneous flow in bubble columns despite the presence of a broad distribution of bubble sizes, if turbulence and bubble swarm effects on momentum exchange between phases are properly accounted for. Swarm corrections adequate for bubble columns, are less successful for co-current heterogeneous flow, for which gas hold-up predictions are least accurate (average error of 22%). K E Y W O R D S churn-turbulent flow regime, dispersed flow regime, experimental validation, gas-liquid flow, two-fluid Euler-Euler model

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“…28 Step 2 employed an Euler-Euler approach. 30,31 The oxygen gas was treated as a dispersed fluid with a specific diameter equal to that in the corresponding experiment. 30,31 The oxygen gas was treated as a dispersed fluid with a specific diameter equal to that in the corresponding experiment.…”

Section: Verification Through Simulationmentioning

confidence: 99%

“…29 With oxygen gas and water feeding, the volume fraction of gas phase was modeled through the RSM and two-fluid model. 30,31 The oxygen gas was treated as a dispersed fluid with a specific diameter equal to that in the corresponding experiment. Step 3 used an Euler-Lagrange approach.…”

Section: Verification Through Simulationmentioning

confidence: 99%

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

Qian

et al. 2018

AIChE Journal

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A planar cyclone is designed for visualizing bubbles in the cross‐section of a degassing hydrocyclone. The pressure distribution is studied through a series of experiments and Reynolds stress model simulations. The velocity distribution of the planar cyclone mostly exhibits the quasi‐forced vortex zone and boundary layer zone. The bubble dynamics are simulated using both Euler‐Euler and Euler‐Lagrange approaches, and the output is compared with the imaging results. The Euler‐Euler simulation provides more accurate predictions of the bubble trajectory. The histograms of residence time and traveling distance given by the Euler‐Lagrange approach exhibit a reasonably regular pattern. With higher values of the inlet Reynolds number, stronger forces acting on the bubbles lead to a decreased but more uniform residence time. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2689–2701, 2018

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Multiphase turbulence in bubbly flows: RANS simulations

Cited by 86 publications

References 74 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

On the prediction of gas hold‐up in two‐phase flow systems using an Euler–Euler model

Bubble‐separation dynamics in a planar cyclone: Experiments and CFD simulations

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