Air core formation in the hydrocyclone

Neesse, T.; Dueck, J.

doi:10.1016/j.mineng.2007.01.007

Cited by 57 publications

(26 citation statements)

References 10 publications

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“…The R f corresponds one to one with the valve opening in Figure 5. The diameter of the air core is defined as zero when the air core is not formulas have been proposed in the past investigation [2,18] to obtain acceptable prediction of the air core diameter, as can be seen in Figure 8. Where d a , d o , and d u is respectively the diameter of the air core, underflow, and overflow.…”

Section: Effects Of Overflowmentioning

confidence: 99%

“…It is observed that the underflow valve has more significant effect on the air core. The formation of air core is more sensitive to the condition variation of underflow valve, which is because that almost all the air is sucked from it [2] .…”

Section: Effects Of Overflowmentioning

confidence: 99%

“…According to the past investigations [2,28] , the air usually flows from the underflow to the overflow when the air core exists in the hydrocyclone. In our experiments, it is observed that the air flow along the reverse direction.…”

Section: Effects Of Underflowmentioning

confidence: 99%

“…The hydrocyclones have been used extensively in mineral processing, environmental engineering, dying engineering, petrochemical industry, and bioengineering [1][2][3][4] . A typical hydrocyclone consists of a cylindrical section with a central tube, a conical section with a discharge tube, and an inlet tube attached to the top section of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

“…In order to capture the process of the air core formation, the high speed photography are adopted by Neesse et al. [2] . 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] .…”

Section: Introductionmentioning

confidence: 99%

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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: Effects Of Overflowmentioning

confidence: 99%

Section: Effects Of Overflowmentioning

confidence: 99%

Section: Effects Of Underflowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on the air core in a hydrocyclone

2016

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On the simulation of hydrocyclones using CFD

et al. 2012

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This study reports on the development of a complete solution methodology for the simulation of a hydrocyclone. A commercial software package, Ansys 12 Fluid Dynamics, is used to solve the governing conservation equations. Turbulence is modelled using the large eddy simulation, and the discrete particle model was used to predict the particle separation. Two hydrocyclones of differing geometries are explored, and the results compared with experimental values. It is shown that there are two key factors for obtaining a reliable result. The first is the domain discretisation, and the second is the generation of a consistent initial value, including the establishment of a stable air core. Using the methodology developed, superior agreement was obtained for predicted and experimental values of pressure, velocity distribution, air core profile and separation efficiency. © 2012 Canadian Society for Chemical Engineering

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A quantitative analysis of turbulent drag reduction in a hydrocyclone

2014

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Turbulent drag reduction has been observed to occur over a wide range of additive systems, such as solution of synthetic or natural polymers, and fibre suspensions. In this study, the influence of softwood kraft pulp fibres and synthetic polymer additives on turbulent drag reduction (DR) in a hydrocyclone is investigated. It was demonstrated that cellulose fibre suspensions and aqueous polymeric solutions reduce the fluid energy losses in comparison to water during hydrocyclone operation within the range of reject ratios studied. A maximum drag reduction of 58% and 55% was found to occur at a volume split fraction of 50% for a 0.9% fibre suspension and a 300 ppm anionic polyacrylamide solution, respectively. Polymer degradation or polymer chain decay displayed adverse effects for 100 ppm and 150 ppm solutions after 22 min of run time at 11.2 kW pumping power and a reject ratio of 25%. Synergistic effects were observed with pulp suspensions containing both cationic and anionic polyacrylamide (CPAM and APAM, respectively); a maximum DR of 41% was observed for a 0.7% fibre suspension containing 100-300 ppm of polymer at a reject ratio of 50%. Similarly to aqueous polymer solutions, the degradation of 300 ppm APAM or CPAM in a 0.7% fibre suspension decreased the observed DR up to 38% after 30 min of run time at 11.2 kW pumping power and a reject ratio of 25%. The near 43% reduction in CPAM concentration, due to surface adsorption, when present in a 0.7% fibre suspension assisted in quantifying the DR variations observed between suspensions containing APAM or CPAM.

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Air core formation in the hydrocyclone

Cited by 57 publications

References 10 publications

Experimental study on the air core in a hydrocyclone

Experimental study on the air core in a hydrocyclone

On the simulation of hydrocyclones using CFD

A quantitative analysis of turbulent drag reduction in a hydrocyclone

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