The “fish-hook” phenomenon in centrifugal separation of fine particles

Majumder, A. K.; Yerriswamy, P.; Barnwal, J. P.

doi:10.1016/j.mineng.2003.07.001

Cited by 53 publications

(21 citation statements)

References 2 publications

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“…Interestingly, Majumder et al (2003), maintain that V NG is proportional to cube root of acceleration in the Newtonian regime and Eq. (9) is applicable in the transient regime.…”

Section: Flow Regime Based Modelmentioning

confidence: 99%

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Fish hook effect in centrifugal classifiers – a further analysis

Nageswararao¹,

Medronho

2014

International Journal of Mineral Processing

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“…Interestingly, Majumder et al (2003), maintain that V NG is proportional to cube root of acceleration in the Newtonian regime and Eq. (9) is applicable in the transient regime.…”

Section: Flow Regime Based Modelmentioning

confidence: 99%

“…The basis for the so called 'mechanistic' model for the fish hook by Majumder et al (2003) is the presumption of a sharp fall in settling velocities of solid particles as the flow changes from Stokesian to transient regime.…”

Section: Flow Regime Based Modelmentioning

confidence: 99%

Fish hook effect in centrifugal classifiers – a further analysis

Nageswararao¹,

Medronho

2014

International Journal of Mineral Processing

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“…By doing so, the overflow fraction will exhibit a narrow particle-size distribution, as confirmed experimentally. 25 Some authors explained the occurrence of fine particles in the coarse fraction by the fish-hook effect, 26,27 which, to the opinion of the authors, may not be the case, especially in centrifuges. The rarely observed fish-hook effect is a phenomenon that has been observed in small hydrocyclones.…”

Section: W5mentioning

confidence: 99%

Pseudo two‐dimensional modeling of sediment build‐up in centrifuges: A compartment approach using compressional rheology

et al. 2013

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in Wiley Online Library (wileyonlinelibrary.com) Both a new modeling approach and new experimental data for the sediment build-up in centrifuges are presented. In semibatch apparatus, the suspension is continuously fed to the centrifuge, separating the particles inside the rotor and discharging the clarified liquid. The solid phase is removed once the capacity of the centrifuge is reached. The solids fraction of the sediment depends on the rheological properties of the cake. The sediment growth and consolidation throughout the process can be calculated using a pseudo two-dimensional approach that takes into account particle-size dependent settling, sediment compressibility, the centrifugal force field, and the geometry of the bowl. The predictions of the separation behavior and the particle-size distributions of the sediment and overflow are compared with experimentally obtained results, showing improved accuracy when compared to simpler models. The model presented is applicable to all solid-bowl centrifuges without conveying systems. V C 2013 American Institute of Chemical Engineers AIChE J, 59: [3843][3844][3845][3846][3847][3848][3849][3850][3851][3852][3853][3854][3855] 2013

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“…Finch 9 and Neesse et al 10 pointed out that the reason was related to the entrainment of fine particles in polydisperse suspensions. Kraipech et al 11 and Majumder et al 12 further gave an explanation that fine particles were dragged by the wakes generated behind larger particles. The different views indicate that the mechanism governing the fish-hook phenomenon is very complicated and likely multifaced.…”

Section: Introductionmentioning

confidence: 99%

Computational investigation of the mechanisms of particle separation and “fish‐hook” phenomenon in hydrocyclones

Wang

2009

AIChE Journal

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The motion of solid particles and the ''fish-hook'' phenomenon in an industrial classifying hydrocyclone of body diameter 355 mm is studied by a computational fluid dynamics model. In the model, the turbulent flow of gas and liquid is modeled using the Reynolds Stress Model, and the interface between the liquid and air core is modeled using the volume of fluid multiphase model. The outcomes are then applied in the simulation of particle flow described by the stochastic Lagrangian model. The results are analyzed in terms of velocity and force field in the cyclone. It is shown that the pressure gradient force plays an important role in particle separation, and it balances the centrifugal force on particles in the radial direction in hydrocyclones. As particle size decreases, the effect of drag force whose direction varies increases sharply. As a result, particles have an apparent fluctuating velocity. Some particles pass the locus of zero vertical velocity (LZVV) and join the upward flow and have a certain moving orbit. The moving orbit of particles in the upward flow becomes wider as their size decreases. When the size is below a critical value, the moving orbit is even beyond the LZVV. Some fine particles would recircuit between the downward and upward flows, resulting in a relatively high separation efficiency and the ''fish-hook'' effect. Numerical experiments were also extended to study the effects of cyclone size and liquid viscosity. The results suggest that the mechanisms identified are valid, although they are quantitatively different.

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The “fish-hook” phenomenon in centrifugal separation of fine particles

Cited by 53 publications

References 2 publications

Fish hook effect in centrifugal classifiers – a further analysis

Fish hook effect in centrifugal classifiers – a further analysis

Pseudo two‐dimensional modeling of sediment build‐up in centrifuges: A compartment approach using compressional rheology

Computational investigation of the mechanisms of particle separation and “fish‐hook” phenomenon in hydrocyclones

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