Validation of CFD model of multiphase flow through pipeline and annular geometries

Sultan, Rasel A.; Rahman, Mohammad Azizur; Rushd, Sayeed; Zendehboudi, Sohrab; Kelessidis, Vassilios C.

doi:10.1080/02726351.2018.1435594

Cited by 26 publications

(11 citation statements)

References 58 publications

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“…[53] Applications of CFD in the simulation of multiphase flow systems in different processes have grown considerably in recent years. [20][21][22][23][24] Most of the published studies used two-dimensional simulation models due to memory usage and processor speed issues. [54,55] Zhang et al's model was employed to simulate three-dimensional homogeneous fluidization of Geldart type A particles.…”

Section: Background and Literature Reviewmentioning

confidence: 99%

“…[22,23] CFD studies are normally used to further understand gas and solid complex behaviours in multiphase systems. [24][25][26][27][28] Both the Eulerian-Eulerian (EE) and Eulerian-Lagrangian (EL) approaches are mostly employed for the simulation of multiphase flow in fluidized beds. [2] The EL approach is a discrete element method (DEM) based on the molecular dynamics approach.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

2022

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A two-dimensional gas-solid tapered fluidized bed at laboratory-scale in a homogenous fluidization regime is simulated using the computational fluid dynamics (CFD) software COMSOL 5.4. The Eulerian-Eulerian (EE) hydrodynamic model is used to predict the minimum fluidization velocity, minimum bubbling velocity, bed height, and solid volume fraction of alumina particles (in Geldart Group A) in the bed with different tapered angles.The effects of static bed heights on the minimum fluidization velocity of tapered beds are investigated. The highest minimum fluidization velocity is 6 mm/s with a static height of 11 mm and a tapered angle of 12 . The bed height is increased with increasing superficial air velocity. At a given air velocity, the minimum bed height is obtained at a 12 tapered angle. A decrease in solid volume fraction is also observed upon an increase in the superficial air velocity. The CFD results show an almost uniform solid concentration over the bed height. The homogenous or non-bubbling regime appears in a wider range of critical velocity at a 12 tapered angle. In the case of a 0 tapered angle, the results of this study and the discrete element method computational fluid dynamics (DEM-CFD) simulation exhibit a good match. In the case of 6 and 12 tapered angles, the proposed model leads to good predictions based on the theory of homogenous fluidization of Geldart Group A. This research introduces a rapid and cost-effective approach for the better design and operation of a tapered fluidized bed in large scales.

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Section: Background and Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

2022

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“…Most of the applications of the KTGF model for simulations of slurry pipeline flow have been interpretative rather than predictive, as shown in Figure 18. Many of these interpretative studies (e.g., see Chen et al [132], Kaushal et al [67], Gopaliya et al [145,146], Zhang et al [75], Sultan et al [147], Li et al [148]) make comparisons between predicted and experimental macroscopic variables such a pressure drop and concentration gradient while others, like the study of Hashemi et al [134], use simulations to study difficult-to-measure variables, such as velocity fluctuations or turbulence attenuation. It is speculated that the preponderance of interpretive studies is inversely related to the attention paid to rigorous verification and validation (V&V) techniques.…”

Section: Verification and Validation Of Eulerian Ktgf Modelsmentioning

confidence: 99%

Computational Fluid Dynamics Modelling of Liquid–Solid Slurry Flows in Pipelines: State-of-the-Art and Future Perspectives

et al. 2021

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Slurry pipe transport has directed the efforts of researchers for decades, not only for the practical impact of this problem, but also for the challenges in understanding and modelling the complex phenomena involved. The increase in computer power and the diffusion of multipurpose codes based on Computational Fluid Dynamics (CFD) have opened up the opportunity to gather information on slurry pipe flows at the local level, in contrast with the traditional approaches of simplified theoretical modelling which are mainly based on a macroscopic description of the flow. This review paper discusses the potential of CFD for simulating slurry pipe flows. A comprehensive description of the modelling methods will be presented, followed by an overview of significant publications on the topic. However, the main focus will be the assessment of the potential and the challenges of the CFD approach, underlying the essential interplay between CFD simulations and experiments, discussing the main sources of uncertainty of CFD models, and evaluating existing models based on their interpretative or predictive capacity. This work aims at providing a solid ground for students, academics, and professional engineers dealing with slurry pipe transport, but it will also provide a methodological approach that goes beyond the specific application.

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“…Although large eddy simulation and direct numeric simulation can accurately reproduce the turbulent flow field structure, for practical engineering problems, the huge amount of calculations makes it difficult to use these two methods generally. Therefore, in practical engineering, the use of turbulence model to deal with the problem is currently commonly used research methods [23]. In engineering problems, commonly used turbulence models mainly include: Standard k − ε model, RNG k − ε model and Realizable k − ε model.…”

Section: Selection Of Turbulence Model For Horizontal Slurry Migratiomentioning

confidence: 99%

Analysis of Multi-Phase Mixed Slurry Horizontal Section Migration Efficiency in Natural Gas Hydrate Drilling and Production Method Based on Double-Layer Continuous Pipe and Double Gradient Drilling

et al. 2020

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In order to improve the recovery efficiency of natural gas hydrate in solid-state fluidized mining of natural gas hydrate, we solve drilling safety problems, such as narrow density of natural gas hydrate formation pressure window and poor wellbore stability caused by high upstream velocity during drilling and production. In this study—in order to increase the natural gas hydrate output and reduce production costs—based on the principle of the solid-state fluidized mining, a natural gas hydrate drilling method based on double-layer continuous-pipe double-gradient drilling was proposed to solve the above problems. The article introduces a drilling and production tool combination scheme and the mathematical model of wellbore-pressure dynamic regulation. Simulation software was used to study and compare the migration efficiency of multiphase mixed slurries of sediment and natural gas hydrates in the horizontal section of the double-layer continuous-pipe double-gradient drilling method and traditional drilling method. The results show that the transport efficiency of the multiphase mixed slurry of sediment and natural gas hydrate in the horizontal section of the double-layer continuous-pipe double-gradient drilling method is better than the traditional drilling method under the same conditions. When the double-layer continuous-pipe double-gradient drilling method is adopted, the multiphase mixed slurry of sediment and natural gas hydrate is transported in the pipe and has the function of the submarine lift pump, which effectively avoids the problem of the stability of the shaft wall caused by excessive flow velocity. This will also be more suitable for the transportation of large-diameter particles during the solid-state fluidized mining of natural gas hydrates.

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Validation of CFD model of multiphase flow through pipeline and annular geometries

Cited by 26 publications

References 58 publications

Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

Computational Fluid Dynamics Modelling of Liquid–Solid Slurry Flows in Pipelines: State-of-the-Art and Future Perspectives

Analysis of Multi-Phase Mixed Slurry Horizontal Section Migration Efficiency in Natural Gas Hydrate Drilling and Production Method Based on Double-Layer Continuous Pipe and Double Gradient Drilling

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