Simulation and experiment on transitional behaviours of multiphase flow in a hydrocyclone

Wang, Chenxiang; Chen, Ji; Zou, Jun

doi:10.1002/cjce.22274

Cited by 19 publications

(12 citation statements)

References 38 publications

(43 reference statements)

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“…The feed inlet, underflow, and overflow products that are collected at the sampling points are filtered, dried, and weighed. The separation efficiency in this study is defined as the ratio of particle mass of the underflow to particle mass of the feed flow …”

Section: Methodsmentioning

confidence: 99%

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Experimental and numerical study of a hydrocyclone with the modification of geometrical structure

Liu

Zhang

et al. 2018

Can J Chem Eng

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This paper proposes two kinds of structure-modified hydrocyclone that exhibit better performance than the traditional ones. In type-1, in which the outer edge of the vortex finder is hexagonal, the separation efficiency increases by 18.1 % compared to the conventional hydrocyclone, while type-3, with a hexagonal conical section, can save 49.7 % of energy. To determine the reasons for the improvement in performance, numerical simulations are conducted to observe the flow field inside the hydrocyclones. Tangential, radial, and axial velocities are all studied in this research according to the simulation results. The radial velocity has a close relationship with separation efficiency. Based on the analysis, the separation mechanisms of different types of hydrocyclones are proposed. Furthermore, the air core, which is captured by a CCD camera, as a factor correlative to the flow pattern is also supportive of the improvement. The smoke area, which has many small air bubbles around the vortex finder, is defined in this work. The existence of the smoke area has a negative influence on energy transfer and separation efficiency.

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Section: Methodsmentioning

confidence: 99%

“…The SIMPLEC pressure‐velocity coupling algorithm and PRESTO pressure interpolation method are selected. Second‐order upwind models are chosen for the discretization of other variables . Other parameters are kept with the original settings.…”

Section: Simulationmentioning

confidence: 99%

Experimental and numerical study of a hydrocyclone with the modification of geometrical structure

Liu

Zhang

et al. 2018

Can J Chem Eng

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“…Besides experiments, some researchers analyzed the hydrocyclone flow in theoretical ways and proposed some empirical and semi-empirical formulas about the diameter of air core [17][18][19][20] . Computational fluid dynamics also provide an effective way to investigate the characteristics of the air core inside hydrocyclones [21][22][23][24] . Up to now, most of theoretical and experimental works focus on the air core when it is stable.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the air core in a hydrocyclone

2016

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The evolution of air core is an important phenomenon in hydrocyclones, which is sensitive to the operating conditions. The morphology of the air core in a hydrocyclone is studied experimentally, using a high-speed video camera and a noise analyzer. Three stages are observed during the increase of flow rate from 300 to 2400 liters per hour, which could be separated by both the noise measurement and the stability of the air core. The flow rate is found to have a nonmonotonic effect on the diameter of the air core, leading to a peak diameter. The influence of the overflow and underflow on the underflow-to-throughput ratio and air flow patterns are also investigated. It is found that the underflow-to-throughput ratio and air flow patterns are sensitive to the valve openings of both outlets.

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“…Due to the complex interaction between the particles, and between particles and fluids, the mechanism of high-concentration slurry classification is still unclear. DPM ignores the interaction between particle phases and can be used to describe the movement of particles in a system with a lower concentration [25,26]. Theoretically, the Mixture model and Euler-Euler model can be used to simulate high-concentration systems, but the mixture model and Euler-Euler model assume that the particles are continuous and uniform, and the collision between particles is ignored.…”

Section: Introductionmentioning

confidence: 99%

High Concentration Fine Particle Separation Performance in Hydrocyclones

Zhang¹,

Yang²,

Jiang³

et al. 2021

Minerals

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The vast majority of current research on hydrocyclone field centrifugal separation focuses on low concentration fluids having volume fraction less than 3%. For high-concentration fluids having volume fractions greater than 10%, which are often encountered in engineering, the law governing particle motion and the classification mechanism are still unclear. In order to gain insights into the interaction between fine particles in the high concentration hydrocyclone field and to improve the hydrocyclone separation performance of these particles, a Dense Discrete Phase Model (DDPM) of the Euler-Eulerian method under the Ansys Fluent 14.5 software was employed. Numerical simulations were carried out to study the characteristics of the hydrocyclone field of dense particles and the influence of parameters, such as the diameter of the overflow outlet, diameter of the underflow outlet, and material concentration, on separation performance. The trajectories and separation efficiencies of two kinds of fine particles with different densities and six different particle sizes at high concentration were obtained. The results show that for the hydrocyclone classification of high-concentration fine particles, particles with large density and small particle size are more likely to enter the internal cyclone and discharge from the overflow. Particles with small density and large particle size are more likely to enter the external cyclone and discharge from the underflow. The research results of this topic could provide a feasible reference and theoretical basis for the centrifugal separation of high-concentration fine particle fluid.

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Simulation and experiment on transitional behaviours of multiphase flow in a hydrocyclone

Cited by 19 publications

References 38 publications

Experimental and numerical study of a hydrocyclone with the modification of geometrical structure

Experimental and numerical study of a hydrocyclone with the modification of geometrical structure

Experimental study on the air core in a hydrocyclone

High Concentration Fine Particle Separation Performance in Hydrocyclones

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