CFD modeling for pipeline flow of fine particles at high concentration

Kaushal, D. R.; Thinglas, T.; Tomita, Yoshihiro; Kuchii, Shigeru; Tsukamoto, Hiroshi

doi:10.1016/j.ijmultiphaseflow.2012.03.005

Cited by 216 publications

(125 citation statements)

References 8 publications

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“…[43], for gas-solid multiphase flows, and [17,43,45], for the evaluation of the liquid-solid drag in the framework of pipeline slurry flows, fluidized bed reactors, as well as in other chemical reacting systems, see e.g. [27,22,39,46,11,37], or in numerical modelling of volcanic eruptions, see e.g. [8,9].…”

Section: The Multiphase Model Equationsmentioning

confidence: 99%

A Multiphase Model for the Numerical Simulation of Ice-Formation in Sea-Water

Covello¹,

Abbà²,

Bonaventura³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The first aim of this work is to improve the models currently available for the simulation of ice production in turbulent seawater, by means of the development of a multiphase model able to describe all the stages of ice production, overcoming the limitation of previous attempts, mainly based on Boussinesq approximation. We consider the mixture of ice and seawater as a dense compressible fluid, and we model the behaviour of seawater by an equation of state that links seawater density to temperature, salinity and pressure. The model is able to reproduce the interaction phenomena occurring between phases when the ice volume fraction exceeds the values allowed by the Boussinesq approximation, including in the momentum equations additional terms, related to the drag force between liquid and particles, and to the particle-particle interaction force. The second aim of our work is to implement and validate a numerical solver of our model. For this purpose, the model uses a sophisticated modelling approach, typically adopted for the numerical simulation of multiphase flows of industrial interest. The multiphase model can be coupled to the Large Eddy Simulation technique. The behaviour of the governing equations in the incompressible limit is investigated by means of a low-Mach number asymptotic analysis. The divergence constraint condition for the velocity field of continuous phase can then been imposed on the zero-Mach number equations by means of a projection method. The governing equations are discretized using the finite volume method, and the performance of the multiphase model has been assessed by solving a laminar Rayleigh-Bénard convection, for both large and small ice concentration regimes. In small concentration regime, the numerical solutions have been compared with the solutions obtained by a finite difference numerical code, based on the Boussinesq approximation.

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Section: The Multiphase Model Equationsmentioning

confidence: 99%

A Multiphase Model for the Numerical Simulation of Ice-Formation in Sea-Water

Covello¹,

Abbà²,

Bonaventura³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…The Mixture Model (Manninen, Taivassalo & Kallio, 1996) was used to perform a series of numerical studies on pipe flows of both zircon-water and silica-water mixtures to a maximum of 20 % solid volumetric fraction: all of them showed good agreement with the experimental data (Ling et al, 2003); this same model was also used together with the Standard/High Reynolds k-ε Turbulence Model for highly concentrated solid-liquid flow in pipes (Kaushal et al, 2012) with results far from satisfactory due to an over-prediction of the pressure drop in the pipe section, which increased with solids concentration. Another approach, using the Mixture Model and a Low Reynolds Turbulence closure, was employed to describe highly concentrated flows of solid-liquid suspensions (Silva et al, 2014;Silva et al, 2013).…”

Section: Euler-euler Numerical Modelsmentioning

confidence: 99%

Settling Suspensions Flow Modelling: A Review

Silva

Garcı́a

Faia

et al. 2015

KONA

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In spite of the widespread application of settling suspensions, their inherent complexity has yet to be properly predicted by a unified numerical model or empirical correlation, and usually industries still possess customized charts or data for their particular suspension. This is, clearly, rather inefficient and can lead to oversized dimensioning, low energy efficiency and even operation limitations/difficulties. In this manuscript a review of empirical correlations, charts and numerical models that have been employed to predict the behaviour of settling suspensions is briefly described, providing information on the advantages and drawbacks of each method. Their evolution throughout the years: from Durand and Condolios correlations, to empirical models by Wasp, single phase simplifications with mixture properties by Shook and Roco, and to other Euler-Euler or Euler-Lagrangian numerical models, will be presented. Some considerations on recent particle migration and turbulence modification publications will be added. In addition, information about some current CFD application of LatticeBoltzmann and Discrete Element Method (DEM) will be given. Lastly, data from CFD modelling employed by the authors that is able to predict turbulence attenuation in settling flows with medium sized particles for different concentrations is reported.

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“…where, C p is the efflux concentration in the slurry pipeline [24] and can be computed using the following equation:…”

Section: Boundary Conditionsmentioning

confidence: 99%

Investigation of Hydroabrasion in Slurry Pipeline Elbows and T-junctions

Azimian¹,

Bart²

2014

JEPE

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Abstract:The present study demonstrates the comparison of erosion rate of critical pipeline parts, namely elbow and T-junction which face the maximum erosion in a pipeline and may cause an early damage and failure of the system. CFD (computational fluid dynamics) with an Eulerian-Lagrangian approach coupled with an approved erosion model is applied to visualize the 3-D flow behavior of slurry flow in both parts and to predict the erosion rate and the location of erosion at the internal surfaces. The analysis of slurry erosion is performed in five steps; geometry and grid generation, grid study/refinement, fluid flow solution, solid particles tracking and finally, the erosion calculation. In previous publications in literature considering transportation of gas-solid flows in pipe parts, the application of T-junctions instead of elbows for specified conditions in order to reduce the erosion is recommended. In this article, it is approved that for liquid-solid flows, the Stokes number is reasonably smaller than the values for gas-solid flows. This causes the solid particles tightly couple to the fluid phase and to travel more closely with the fluid streamlines. The effects of important influencing parameters such as feed flow velocity, solid concentration, particle size and shape are investigated in detail in current work. It was found that for liquid-solid flows, the erosion of T-junction for all of the mentioned influencing parameters, due to its geometrical specifications and Stokes number variation in comparison with gas-solid flows, is reasonably higher than erosion of elbow. Due to these findings, in contrary to the gas-solid mixture flows, application of T-junction instead of elbow for liquid-solid flow transportation is not recommended.

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CFD modeling for pipeline flow of fine particles at high concentration

Cited by 216 publications

References 8 publications

A Multiphase Model for the Numerical Simulation of Ice-Formation in Sea-Water

A Multiphase Model for the Numerical Simulation of Ice-Formation in Sea-Water

Settling Suspensions Flow Modelling: A Review

Investigation of Hydroabrasion in Slurry Pipeline Elbows and T-junctions

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