Modelling of mass transfer for gas-liquid two-phase flow in bubble column reactor with a bubble breakage model considering bubble-induced turbulence

Shi, Weibin; Yang, Xiaogang; Sommerfeld, Martin; Yang, Jie; Cai, Xinyue; Li, Guang; Zong, Yanbing

doi:10.1016/j.cej.2019.04.047

Cited by 54 publications

(36 citation statements)

References 75 publications

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“…The no-slip boundaries are used for walls. Due to the significant increase in grid number, and the convergence problems caused by the structure of gas spargers, ,,, the influence of gas distributors is ignored in this study. A uniform BSD of 2.4 mm is adopted at the inlet .…”

Section: Models and Numerical Detailsmentioning

confidence: 99%

“…The RNG and standard k –ε turbulence models were widely applied in the modeling of bubble columns, − , and the RNG k –ε turbulence model is selected in this work. Furthermore, Ishii’s drag force model, Tomiyama’s lift force model, Burn’s turbulent dispersion force model, Frank’s wall lubrication force model, Prince’s coalescence model, and Luo’s breakup model, which have been extensively used in the CFD-PBM simulation of bubble columns, − are used in numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

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CFD-PBM Simulation of Bubble Columns: Sensitivity Analysis of the Nondrag Forces

Zhang

Yan

Luo

2020

Ind. Eng. Chem. Res.

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In this work, the effect of nondrag forces (lift force, turbulent dispersion force, wall lubrication force, and virtual mass force) and bubble-induced turbulence (BIT) on the computational fluid dynamics-population balance model (CFD-PBM) simulation of air–water bubble columns operated at 0.01, 0.05, 0.10, 0.11, and 0.23 m/s is investigated. The simulation results indicate that the local gas holdup, axial liquid velocity, global bubble size distribution (BSD), and global Sauter mean diameter are significantly affected by the lift force. Without the lift force, the radial profiles of gas holdup become flatter and the global Sauter mean diameter becomes smaller. The accuracy of simulation results can be improved by considering the lift force. The turbulent dispersion force has a large impact on the local gas holdup. Comparatively, the effect of the wall lubrication force, virtual mass force, and BIT on simulation results is small.

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Section: Models and Numerical Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD-PBM Simulation of Bubble Columns: Sensitivity Analysis of the Nondrag Forces

Zhang

Yan

Luo

2020

Ind. Eng. Chem. Res.

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“…Turbulent phenomena are represented in the bubble swarm linkage and separation models [18]. A bubble breakup is affected by the bubble-induced turbulence [19]. The size of collided turbulence is an effective contribution to the bubble breakup process based on the change of surface energy [20].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Angular momentum tearing mechanism investigation through intermolecular at the bubble interface

Tjahjono

Wardana

Sasongko

et al. 2020

EEJET

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Two-phase flow with gas-liquid component is commonly applied in industries, specifically in the refinery process of liquid products. Oil products with bubbles contents are undesirable in a production process. This paper describes an investigation of a process mechanism regarding the bubble breakup of the two-phase injection into quiescent water. The analytical model was developed based on the force mechanism of water flow at the bubble interface. The inertia force of water flow continually pushes the bubble while the drag force resists it. The bubble gets shapes change that affects the hydrodynamic flow around the bubble. Vortices with high energy density impact and make the stress interface over its strength so that the interface gets tear. The experiment was carried out by observing in the middle part of the injected flow. It was found that the forming process of bubble breakup can be explained as the following steps: 1) sweep model is a bubble pushed by the inertial force of water flow. The viscous force of water shears the surface of the bubble. The effect of both forces, the bubble changes its shape. Then trailing vortex starts to appear in near bubble tail. The second flow of water is in around of the bubble to strengthen the vortex energy density that causes fragments to detach from the parent bubble; 2) stretching model, the apparent bubble has high momentum force infiltrated in stagnant water depth and bubble ends are stretched out by the inertial force of the bubble and viscous force of water. The bubble surface has experienced stretching and tearing become splitting away. Based on the finding, the breakup process is highly dependent on the momentum of water flow, which triggers the secondary flow as the initial process of vortex flow, and it causes the tear of the bubble surface due to angular momentum

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“…during the rising process. Turbulence, including bubble-induced turbulence [9][10][11], and a local flow eddy [12] could be regarded as an important factor in improving the mass transfer and bubble breakup rate in the BCs, since strong turbulence characteristics [13] and eddy can improve the poor mixing capacity in a gas-liquid flow.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Configurations on Bubble Cutting and Process Intensification in a Micro-Structured Jet Bubble Column Using Digital Image Analysis

et al. 2021

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An experimental study was conducted in this work to investigate the effect of different configurations on bubble cutting and process intensification in a micro-structured jet bubble column (MSJBC). Hydrodynamic parameters, including bubble size, flow field, liquid velocity, gas holdup as well as the interfacial area, were compared and researched for a MSJBC with and without mesh. The bubble dynamics and cutting images were recorded by a non-invasive optical measurement. An advanced particle image velocimetry technique (digital image analysis) was used to investigate the influence of different configurations on the surrounding flow field and liquid velocity. When there was a single mesh and two stages of mesh compared with no mesh, the experimental results showed that the bubble size decreased by 22.7% and 29.7%, the gas holdup increased by 5.7% and 9.7%, and the interfacial area increased by more than 34.8% and 43.5%, respectively. Significant changes in the flow field distribution caused by the intrusive effect of the mesh were observed, resulting in separate liquid circulation patterns near the wire mesh, which could alleviate the liquid back-mixing. The mass transfer experiment results on the chemical absorption of CO2 into NaOH enhanced by a mass transfer process show that the reaction time to equilibrium is greatly reduced in the presence of the mesh in the column.

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Modelling of mass transfer for gas-liquid two-phase flow in bubble column reactor with a bubble breakage model considering bubble-induced turbulence

Cited by 54 publications

References 75 publications

CFD-PBM Simulation of Bubble Columns: Sensitivity Analysis of the Nondrag Forces

CFD-PBM Simulation of Bubble Columns: Sensitivity Analysis of the Nondrag Forces

Angular momentum tearing mechanism investigation through intermolecular at the bubble interface

Effect of Different Configurations on Bubble Cutting and Process Intensification in a Micro-Structured Jet Bubble Column Using Digital Image Analysis

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