Scale adaptive simulation of bubble column flows

Masood, R.M.A.; Khalid, Yasir; Delgado, Antonio

doi:10.1016/j.cej.2014.10.076

Cited by 24 publications

(20 citation statements)

References 32 publications

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“…The simulation procedure is similar to the typical one employed for studying transient bubble column flow [14,15,17,18,20]. The sequence followed in the simulations includes an initial run to reach a statistical steady temporal convergence of the solution.…”

Section: Turbulence Modelingmentioning

confidence: 99%

“…Examples of the Eulerian two-fluid approach with unsteady RANS (URANS) turbulence modeling have been widely applied in the literature for bubble columns [14][15][16][17][18][19][20]. When using an Eulerian two-fluid approach, a proper solution for the bubble columns is dependent on the correct modeling of interphase forces and turbulence models.…”

Section: Introductionmentioning

confidence: 99%

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Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

Besagni

Guédon

Inzoli

2015

Journal of Fluids Engineering

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This paper investigates the countercurrent gas-liquid flow in an annular gap bubble column with a 0.24 m inner diameter by using experimental and numerical investigations. The two-phase flow is studied experimentally using flow visualizations, gas holdup measurements, and double fiber optical probes in the following range of operating conditions: superficial air velocities up to 0.23 m/s and superficial water velocities up to À0.11 m/s, corresponding to gas holdups up to 29%. The flow visualizations were used to observe the flow patterns and to obtain the bubble size distribution (BSD). The gas holdup measurements were used for investigating the flow regime transitions, and the double fiber optical probes were used to study the local flow phenomena. A computational fluid dynamics (CFD) Eulerian two-fluid modeling of the column operating in the bubbly flow regime is proposed using the commercial software ANSYS FLUENT. The three-dimensional (3D) transient simulations have been performed considering a set of nondrag forces and polydispersity. It is shown that the errors in the global holdup and in the local properties are below 7% and 16%, respectively, in the range considered.

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Section: Turbulence Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

Besagni

Guédon

Inzoli

2015

Journal of Fluids Engineering

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“…Rzehak et al [459] compared various formulations applied to vertical bubbly flow in a pipe and concluded that the inclusion of this force into the model is fundamental. The virtual mass force arises from the relative acceleration of an immersed moving object to its surrounding fluid; this force is often found to be negligible in bubble column simulations [421,428,437,439,449,460], and different studies have neglected it [420,430,440,441,446,450,458,[461][462][463][464][465][466][467][468][469]. Recently, Ziegenhein et al [10] demonstrated that the virtual mass force has an influence on the prediction of the turbulence intensity at higher flow rates.…”

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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“…The inlet was set as a single-gas phase. The speed inlet boundary conditions were used: the superficial gas velocity was 0.0024 m/s, the outlet was set as a degassing boundary condition [30,41], and the other physical boundaries were set as solid-wall boundary conditions. The residual error was 10 −5 , the time step was 0.01 s, and the maximum iteration number was 30.…”

Section: Calculation Methodsmentioning

confidence: 99%

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

et al. 2017

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Abstract:A novel computational fluid dynamics-population balance model (CFD-PBM) for the simulation of gas mixing in activated sludge (i.e., an opaque non-Newtonian liquid) in a bubble column is developed and described to solve the problem of measuring the hydrodynamic behavior of opaque non-Newtonian liquid-gas two-phase flow. We study the effects of the inlet position and liquid-phase properties (water/activated sludge) on various characteristics, such as liquid flow field, gas hold-up, liquid dynamic viscosity, and volume-averaged bubble diameter. As the inlet position changed, two symmetric vortices gradually became a single main vortex in the flow field in the bubble column. In the simulations, when water was in the liquid phase, the global gas hold-up was higher than when activated sludge was in the liquid phase in the bubble column, and a flow field that was dynamic with time was observed in the bubble column. Additionally, when activated sludge was used as the liquid phase, no periodic velocity changes were found. When the inlet position was varied, the non-Newtonian liquid phase had different peak values and distributions of (dynamic) liquid viscosity in the bubble column, which were related to the gas hold-up. The high gas hold-up zone corresponded to the low dynamic viscosity zone. Finally, when activated sludge was in the liquid phase, the volume-averaged bubble diameter was much larger than when water was in the liquid phase.

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Scale adaptive simulation of bubble column flows

Cited by 24 publications

References 32 publications

Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

Two-Phase Bubble Columns: A Comprehensive Review

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

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