Flow conditions in the air core of the hydrocyclone

Hararah, Muhanned A.; Endres, Erik; Dueck, J.; Minkov, L.; Neesse, T.

doi:10.1016/j.mineng.2009.12.013

Cited by 38 publications

(18 citation statements)

References 10 publications

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“…The content of the air core comes from the atmosphere outside the hydrocyclone, or from the multiphase flow flowing through the hydrocyclones [9][10] . The previous researches have shown that the presence of air core affected the flow split ratio and the separation efficiency dramatically [11] , as well as the flow state of hydrocyclones [12] .…”

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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Section: Introductionmentioning

confidence: 99%

Experimental study on the air core in a hydrocyclone

2016

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“…The structure and motion of the air core depends on the operating conditions of the hydrocyclone ( [4]). Hararah et al [5] found that the distribution of tangential and axial velocity of air inside the core depends on the pressure drop and geometry of hydrocyclone. Devulapalli [6] experiments show that the inlet flow rate has a direct effect on the air core diameter.…”

Section: Introductionmentioning

confidence: 99%

“…The air/water interface is reconstructed and tracked in VOF method by solving continuity equation for volume fraction of air phase. The experiments conducted by Hararah et al [5] show that the air core destabilizes in the overflow pipe because of decrease in centrifugal forces and produces a mixture of air and water droplet (Aero-Suspension). The use of VOF approach is expensive in terms of computational resources and time to resolve this breakup and coalescence of water droplets and/or air bubbles in overflow pipe.…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation of a Hydrocyclone with an Air Core Using Two-Fluid and Volume-of-Fluid Models

Fayed¹,

Bukhari

Ragab

2021

Fluids

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Large-eddy simulations have been conducted for two-phase flow (water and air) in a hydrocyclone using Two-Fluid (Euler–Euler) and Volume-of-Fluid (VOF) models. Subgrid stresses are modeled using a dynamic eddy–viscosity model, and results are compared to those using the Smagorinsky model. The effects of grid resolutions on the mean flow and turbulence statistics have been thoroughly investigated. Five block-structured grids of 0.72, 1.47, 2.4, 3.81, and 7.38 million elements have been used for the simulations of Hsieh’s 75 mm hydrocyclone Mean velocity profiles and normal Reynolds stresses have been compared with experimental data. Results of the two-fluid model are in good agreement with those of the VOF model. A fine mesh in the axial and radial directions is necessary for capturing the turbulent vortical structure. Turbulence structures in the hydrocyclone are dominated by helical vortices around the air core. Energy spectra are analyzed at different points in the hydrocyclone, and regions of low turbulent kinetic energy are identified and attributed to stabilizing effects of the swirling velocity component.

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“…[9] In recent years, significant research efforts have been devoted to the evaluation of air-core. Hararah et al [10] presented measurements of the air-core diameter in transparent hydrocyclones operated with a suspension of glass spheres. An online sensor-based digital signal processing technique [11] and electrical resistance tomography [12] were used to identify and predict the diameter of an air-core.…”

Section: Introductionmentioning

confidence: 99%

Steady‐state distribution of air‐core in a hydrocyclone

Song

Sun

et al. 2016

Can J Chem Eng

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The structure and movements of the air‐core in a hydrocyclone play a key role in the performance and efficiency of separation. The technique of computational fluid dynamics has been used to evaluate the air‐core characteristics and their influence on the internal flow field for the case of a 140 mm hydrocyclone. Through computational analysis for developed flow in a hydrocyclone, the shape, diameter, and steady‐state distribution of the air‐core were analyzed and presented. The steady‐state distribution of the air‐core could be divided into three distinctive parts. Two parts of the air core, on the cylindrical and spigot sections are very stable, and their shape and diameters do not vary over time. For the third part, on the conical section, the dense transient‐state situation of the air‐core has no clear rule. This results in the dense transient internal flow field, meanwhile, the internal flow fields of the other two parts are stable. Based on the calculation, the analysis of steady state of the air‐core has been extended to operational conditions, including inlet velocities, viscosity, and atmospheric pressure. Those operation factors do not have any influence on the steady‐state situation of the air‐core in the developed flow of hydrocyclone. However, diameters of air core change with those factors. Any increase in the inlet velocity will increase the air‐core diameter.

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Flow conditions in the air core of the hydrocyclone

Cited by 38 publications

References 10 publications

Experimental study on the air core in a hydrocyclone

Experimental study on the air core in a hydrocyclone

Large-Eddy Simulation of a Hydrocyclone with an Air Core Using Two-Fluid and Volume-of-Fluid Models

Steady‐state distribution of air‐core in a hydrocyclone

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