Development of novel hydrocyclone designs for improved fines classification using multiphase CFD model

Vakamalla, Teja Reddy; Koruprolu, Veera Bhadra Rao; Rakesh, Arugonda; Mangadoddy, Narasimha

doi:10.1016/j.seppur.2016.10.026

Cited by 85 publications

(35 citation statements)

References 40 publications

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“…Three kinds of hydrocyclones are designed to improve the particle separation efficiency, and the optimum separation structure is determined by studying the pressure and velocity distribution inside a hydrocyclone [8]. The effect of cone angle structure on the classification of fine particles [9] and of the inlet angle, cylinder height, and inner cone on separation [10,11] are discussed. In addition, studies are conducted on the separation results with hydrocyclones of diverse structures and different working conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size and Shape on Separation in a Hydrocyclone

Tang

Wang

et al. 2018

Water

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Given the complex separation mechanisms of the particulate mixture in a hydrocyclone and the uncertain effects of particle size and shape on separation, this study explored the influence of the maximum projected area of particles on the separation effect as well as single and mixed separations based on CFD–DEM (Computational Fluid Dynamics and Discrete Element Method) coupling and experimental test methods. The results showed that spherical particles flowed out more easily from the downstream as their sizes increased. Furthermore, with the enlargement of maximum projected area, the running space of the particles with the same volume got closer to the upward flow and particles tended to be separated from the upstream. The axial velocity of the combined separation of 60 µm particles and 120 µm particles increased by 25.74% compared with that of single separation of 60 µm particles near the transition section from a cylinder to a cone. The concentration of 60 µm particles near the running space of 120 µm particles increased by 20.73% and those separated from the downstream increased by 4.1%. This study showed the influence of particle size and maximum projected area on the separation effect and the separation mechanism of mixed sand particles in a hydrocyclone, thereby providing a theoretical basis for later studies on the effect of particle size and shape on sedimentation under the cyclone action in a hydrocyclone.

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Section: Introductionmentioning

confidence: 99%

Effect of Particle Size and Shape on Separation in a Hydrocyclone

Tang

Wang

et al. 2018

Water

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“…It was already proved that the usage of k‐ε model limited due to isotropic turbulence assumption, that is, equality of Reynolds stresses in all directions . This has led some of the researchers to use the differential Reynolds stress turbulence model to model the turbulence in hydrocyclones. However, some recent studies have shown that the large eddy simulation (LES) technique has given better flow field predictions over Reynolds averaged turbulence models in hydrocyclones with computationally practical grids.…”

Section: Literature Reviewmentioning

confidence: 99%

The dynamic behaviour of a large‐scale 250‐mm hydrocyclone: A CFD study

Vakamalla

Mangadoddy

2019

Asia-Pacific J Chem Eng

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The fluctuating feed solid contents usually cause instationarities in industrial hydrocyclone separation. This demands a controlling mechanism for stabilizing the separation effect. Understanding the transitional/dynamic behaviour is necessary to design such control mechanisms. In this context, the present paper is aimed to understand the dynamic behaviour of a large-scale 250-mm hydrocyclone in terms of air core development and solid concentration distributions using the modified mixture model coupled with large eddy simulation turbulence model. Numerically predicted two-phase flow field data is validated against laser Doppler velocimetry data at two axial positions. A close agreement is found between the modified mixture model predicted particle classification curve and experimental data. Longer residence time is observed with near cut size particle compared to the and fine size particles. Further, the analysis of the equilibrium radius of different solid particles inside the cyclone in the presence of turbulence is compared with the classical Kelsall experiments and observed that the classification of particles influenced by both the turbulent dispersion and the centrifugal force. Finally, the effect of feed solids concentration (10-50 wt%) on the hydrocyclone performance and particle segregation is also undertaken in this study.

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“…However, structural grids are not well applicable for complicated flow field models. On the contrary, non-structural grids are applicable for any flow field model [21,22], although the calculation is usually time consuming and the accuracy is limited. In flow field models of four product hydrocyclones, the hexahedron structural grid was applied on a hydrocyclone column, while a non-structural grid was applied for feeding inlets and boundaries.…”

Section: Modelling Of Four Product Hydrocyclonementioning

confidence: 99%

The Study on Numerical Simulation and Experiments of Four Product Hydrocyclone with Double Vortex Finders

et al. 2018

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A hydrocyclone is an instrument that can effectively separate multi-phase mixtures of particles with different densities or sizes based on centrifugal sedimentation principles. However, conventional hydrocyclones lead to two products only, resulting in an over-wide particle size range that does not meet the requirements of subsequent operations. In this article, a two-stage series, a four product hydrocyclone is proposed. The first stage hydrocyclone is designed to be a coaxial double overflow pipe: under the effect of separation, fine particles are discharged from the internal overflow pipe, while medium-size particles are discharged from external overflow pipe before entering the second stage hydrocyclone for fine sedimentation. In other words, one-stage grading leads to four products, including the first stage underflow, the first stage overflow, the second stage underflow, and the second stage overflow. The effects of structural parameters and operational parameters on flow field distribution in hydrocyclone were investigated via a study of flow field distribution in multi-product hydrocyclones using numerical simulations. The application of four product hydrocyclone in iron recovery shows that the grade and recovery of iron concentrate exceed 65.08% and 86.14%, respectively. This study provides references for understanding the flow field distribution in hydrocyclones and development of multi-product grading instrument in terms of both theory and industrial applications.

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Development of novel hydrocyclone designs for improved fines classification using multiphase CFD model

Cited by 85 publications

References 40 publications

Effect of Particle Size and Shape on Separation in a Hydrocyclone

Effect of Particle Size and Shape on Separation in a Hydrocyclone

The dynamic behaviour of a large‐scale 250‐mm hydrocyclone: A CFD study

The Study on Numerical Simulation and Experiments of Four Product Hydrocyclone with Double Vortex Finders

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