Effect of variables related to the separation performance of a hydrocyclone with unprecedented geometric relationships

Kyriakidis, Yanne Novais; Silva, Danylo Oliveira; Barrozo, Marcos A.S.; Vieira, Luiz Gustavo Martins

doi:10.1016/j.powtec.2018.07.064

Cited by 51 publications

(21 citation statements)

References 45 publications

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“…The TFM model, treating both liquid and solid phases as interpenetrating continuous media, incorporates the interaction between particles and between the particles and the fluids. This model is increasingly used to study the effect of concentration on the separation performance of hydrocyclones [37]. In this study, the effects of inlet velocity on the TS hydrocyclone were investigated using CFD.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Jiang¹,

Liu²,

Zhang³

et al. 2019

Minerals

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The “entrainment of coarse particles in overflow” and the “entrainment of fine particlesin underflow” are two inevitable phenomena in the hydrocyclone separation process, which canresult in a wide product size distribution that does not meet the requirement of a preciseclassification. Hence, this study proposed a two-stage (TS) hydrocyclone, and the effects of the inletvelocity on the TS hydrocyclone were investigated using computational fluid dynamics (CFD).More specifically, the influences of the first-stage inlet velocity on the second-stage swirling flowfield and the separation performance were studied. In addition, the particle size distribution of theproduct was analyzed. It was found that the first-stage overflow contained few coarse particlesabove 40 μm and that the second-stage underflow contained few fine particles. The second-stageunderflow was free of particles smaller than 10 μm and almost free of particles smaller than 20 μm.The underflow product contained few fine particles. Moreover, the median particle size of thesecond-stage overflow product was similar to that of the feed. Inspired by this observation, wepropose to recycle the second-stage overflow to the feed for re-classification and to use only thefirst-stage overflow and the second-stage underflow as products. In this way, fine particle productsfree of coarse particle entrainment, and coarse particle products free of fine particle entrainmentcan be obtained, achieving the goal of precise classification.

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Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Jiang¹,

Liu²,

Zhang³

et al. 2019

Minerals

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“…By simulating the flow field, the rules that affect the flow field and separation characteristics can be determined, which provides a theoretical basis for optimizing the structural parameters and operating parameters of the hydrocyclone. The literature on the simulation of the hydrocyclone flow field based on CFD technology covers the exploration of the internal hydrocyclone flow field [9][10][11][12], optimization of the structure to improve the separation performance [13][14][15], formation mechanism of the air column, and influence of the air column on the flow field [16][17][18]. In terms of flow field simulation, most scholars agree to use the Reynolds stress model (RSM) [19,20] to treat the turbulent state in the hydrocyclone and use the volume of fluid (VOF) model [21,22] to treat the gas-liquid contact surface.…”

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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“…Commercial software with classic models, which establish relations for the main variables related to fluid flow and heat and mass transfer, have made it possible to simulate and solve complex problems such as reactive systems, multiphase systems, airfoils, and so forth. Examples of CFD simulations are the fluid dynamics of the spouted beds [25][26][27]31], solid-liquid separation in filtering hydrocyclones [13,18], fluid dynamics behavior of a rotary dryer, and rotating disk operating with fertilizers [28,32], gravitational and centrifugal air classifiers [9,11,12,14,30] and others. The study of the fluid dynamics of solid-liquid separation equipment is an example of a model that involves a multiphase fluid phase and a particulate phase.…”

Section: Introductionmentioning

confidence: 99%

Solid–fluid separation in the gravitational field: Courseware generation using computational fluid dynamics simulation

Almeida

Canhadas

Albertini

et al. 2020

Comp Applic In Engineering

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The growth of the Brazilian economy has resulted in an increased demand for engineers and the expansion of Brazilian Universities. As for the teaching of unit operations, a lack of interactive and illustrative courseware was observed. The modeling and simulation tools are excellent alternatives to predict the particle and fluid dynamics and have been used in the design and optimization of industry equipment, providing information in areas where it is difficult to acquire experimental measurements. This paper shows simulations using the computational fluid dynamics technique of the exercises presented in a course on solid-fluid separation in the gravitational field, such as sand chambers, dust chamber, horizontal and vertical elutriators. The effect of size, shape, and density of particles on the collection efficiency was evaluated. Figures and videos generated in this study will facilitate students' understanding of the phenomena involved in the particle collection inside those separation devices.

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Effect of variables related to the separation performance of a hydrocyclone with unprecedented geometric relationships

Cited by 51 publications

References 45 publications

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

High Concentration Fine Particle Separation Performance in Hydrocyclones

Solid–fluid separation in the gravitational field: Courseware generation using computational fluid dynamics simulation

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