Numerical simulation of magnetite segregation in a dense medium cyclone

Narasimha, M.; Brennan, Matthew; Holtham, P. N.

doi:10.1016/j.mineng.2006.03.013

Cited by 51 publications

(35 citation statements)

References 23 publications

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“…Neither of these effects was observed in Subramanian's GRT measurements (2002). Subsequently the modelling was extended where medium was simulated with a size distribution, and wall lift forces based on Saffman's expression (1965) were included, the Ishii and Mishimi (1984) slurry viscosity model was used, and the CFD used Large Eddy Simulation (Narasimha et al, 2006b). In subsequent work (Narasimha et al, 2006c), a Lagrangian approach was superimposed on the Mixture model simulations (using medium) to construct the partition curves for coal particles with reasonable accuracy.…”

Section: Mixture Models For Cyclonesmentioning

confidence: 99%

“…Since these reviews were published, different methods had been developed and tested independently, and an updated review is necessary to develop a comprehensive CFD model for predicting the performance of industrial hydrocyclones for a wide range of design and operating variables. Three main phenomena are of interest to the modelling of particle classification in a hydrocyclone: (i) turbulent flow in the hydrocyclone, (ii) the influence of the pulp rheology on the flow field, and (iii) multiphase flow with different size particles (Narasimha et al, 2006b;Hsieh and Rajamani, 1991;and Sevilla and Branion, 1995). Extensive work had been done in each of these areas, but combining them cohesively to develop a comprehensive model for predicting performance of hydrocyclone for industrial applications would be an enormous task.…”

Section: Introductionmentioning

confidence: 99%

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A Review of CFD Modelling for Performance Predictions of Hydrocyclone

Narasimha

Brennan

Holtham

2007

Engineering Applications of Computational Fluid Mechanics

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A critical assessment is presented for the existing numerical models used for the performance prediction of hydrocyclones. As the present discussion indicates, the flow inside a hydrocyclone is quite complex and there have been numerous numerical studies on the flows and the particle motions in hydrocyclone, with a wide range of turbulence and multiphase models tested. Two-equation k-ε and RNG k-ε models flow velocities with empirical modifications were led to poor results, especially the tangential components in comparison with experimental measurements. Most of the recent studies have utilized the Reynolds stress models (RSM) with different degrees of complexity in the pressurestrain correlation. These RSM studies showed good agreements with velocity measurements. Unfortunately, the velocity profiles were not validated in most of the RSM cases where multiphase particle tracking were applied. Finally, large eddy simulation (LES) is the most advanced turbulence model applied in recent hydrocyclone numeric studies. Besides the additional information on précising the air core correctly, LES provides an additional accuracy in predicting the velocity profiles or the grade efficiency in comparison to the RSM.The multiphase models have been successfully applied in a hydrocyclone to model the Lagrangian motions of spherical particles. Eulerian-Eulerian model have been used to account for the particles effect on the fluid viscosity. Simplified Eulerian model (mixture) model predictions for solid transportation in cyclone were well predicted. Further, the inclusion of modified slip velocity calculation in the Mixture model improves the efficiency predictions close to the experimental data at low feed solid loadings. In future studies, the focus should be to model the three-dimensional flow in a hydrocyclone using at least the Reynolds stress model/LES. The particle tracking should at least include the effects of the turbulence on the particles. All these developed models will only applicable to low feed solid concentration levels. Since most of these models neglect the particle-particle interactions, a more comprehensive numerical method of modified Mixture model is applied for simulating solids flow in hydrocyclones for high feed solids concentration. Explicit models for accounting hindered settling and turbulent diffusion investigated for high feed solid concentrations in industrial cyclones are encouraging.

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Section: Mixture Models For Cyclonesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review of CFD Modelling for Performance Predictions of Hydrocyclone

Narasimha

Brennan

Holtham

2007

Engineering Applications of Computational Fluid Mechanics

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“…This viscosity model is similar to the Ishii and Mishima (1984) viscosity model used in earlier work (Narasimha et al 2006) in that it forces the mixture viscosity to become infinite when the total volume fraction of the medium approaches 0.62 which is approximately the packing density and has the effect of limiting the total medium concentration to less than this value. However the Gidaspow et al model (1992) also makes the viscosity shear dependant.…”

Section: Medium Rheologymentioning

confidence: 90%

“…In this work Fluent has been used with the granular options and the Fluent formulation for the slip velocity has been modified where (i) a shear dependent lift force based on Saffman's (1965) expression and (ii) the gradient of granular pressure (as calculated by the granular options) have been added as additional forces. Adding the gradient of granular pressure as an additional force effectively models Bagnold dispersive forces (Bagnold 1954) and is an enhancement over our earlier work (Narasimha et al, 2006). …”

Section: Multiphase Modeling -Mixture Model With Lift Forcesmentioning

confidence: 95%

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Prediction of Magnetite Segregation and Coal Partitioning In Dense Medium Cyclone Using Computational Fluid Dynamics Technique

Narasimha¹,

Brennan²,

Kruttschnitt³

2010

Computational Fluid Dynamics

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Numerical Investigation of Cyclone Separators: Physical Mechanisms and Theoretical Algorithms

El‐Emam,

Zhou,

Yasser

2024

ChemBioEng Reviews

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Gas‐particle aero‐type cyclones have revolutionized biochemical processes, engineering industries, and environmental pollution protection by effectively separating particles from gas. These devices rely on gravitational energy and centrifugal force to dissipate particle phase energy, but achieving optimal energy efficiency while minimizing pressure drop remains challenging. This has led to the development of various cyclone designs in commercial industries, each with unique energy efficiency characteristics. The intricate gas‐particle flow inside cyclones is a critical issue impacted by cyclone geometry, operating conditions, and media parameters. Advanced numerical simulations have been employed to understand this complex flow pattern better, offering researchers valuable insights into the mechanisms of different cyclone separators. This comprehensive review explores the available numerical methods in the literature on cyclones and their corresponding validations. Computational numerical modeling is a promising technique for predicting cyclone energy efficiency, gas‐particle behavior, and overall performance. This investigation delves into the progress and numerical forms of gas‐particle flow cyclones, examining how different parameters impact cyclone performance and flow patterns within the two‐phase flow. The future developments and challenges that may further promote the development of aero‐type cyclone separators, providing theory and engineering support for future cyclone designs, are also covered. As a result, it can confidently be reported that aero‐type cyclone separators remain a critical component in various industrial sectors, offering energy‐efficient solutions for mitigating environmental pollutants and gas‐particle separation systems. With continued development and research, these devices will undoubtedly shape the future of energy processes and engineering industries, ushering in a new era of sustainability and efficiency.

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Numerical simulation of magnetite segregation in a dense medium cyclone

Cited by 51 publications

References 23 publications

A Review of CFD Modelling for Performance Predictions of Hydrocyclone

A Review of CFD Modelling for Performance Predictions of Hydrocyclone

Prediction of Magnetite Segregation and Coal Partitioning In Dense Medium Cyclone Using Computational Fluid Dynamics Technique

Numerical Investigation of Cyclone Separators: Physical Mechanisms and Theoretical Algorithms

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