Prediction of the settling velocity of irregularly shaped particles

Tsakalakis, Konstantinos; Stamboltzis, G.A.

doi:10.1016/s0892-6875(01)00006-1

Cited by 24 publications

(7 citation statements)

References 2 publications

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“…In the Fig. 12, there are no obvious 13 differences in the slopes of the plots for the three size fractions of quartz.…”

Section: (42)mentioning

confidence: 87%

“…Especially the effect of particle shape on hydrocyclone separation is not sufficiently understood. There are numerous investigations of the settling velocity and drag coefficient of irregularly shaped or non-spherical particles in 3 gravitational fields [5][6][7][8][9][10][11][12][13]. However there are few reports describing the effect of particle shape on the settling and separation behavior in hydrocyclones, except a paper on the application of hydrocyclones to shape separation of fine particles [14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of particle shape on hydrocyclone classification

et al. 2012

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Influence of particle shape on hydrocyclone classification was investigated. Classification tests using hydrocyclone and cyclosizer showed that coarse fractions of plate-like particles such as PTFE and glass flake used here were not necessarily recovered as underflow product, especially at relatively high inlet velocity. Settling velocity of the glass flake particles in centrifugal field was estimated using a centrifugal particle size analyzer, and it was revealed that differences in settling velocity between coarse and fine glass flake particles became smaller with increases in angular velocity. Moreover, settling test of glass plate in water or glycerin solution was conducted to know relationship between particle Reynolds number (Re) and settling velocity of the plate. At smaller Re condition, the glass plate settled straight and stably, and larger plate settled faster than smaller plate.However, oscillating motion of the plate occurred in the region of high Re, and settling velocities of the large plate became smaller than that of the small plate in such conditions. Drag coefficient (C) calculated based on the settling velocity of the glass plate is similar to that of glass spheres below Re of about 50, above which it became larger than that of glass sphere.Approximation formula of correlaton between Re and C suggests that the influence of the Re on C can be neglected in the region of high Re, and C increases with increases in the ratio of the particle diameter to thicknessThe decrease of the difference in settling velocity recognized in the centrifugal settling test and the effect of the particle shape (D/T) on C at high Re region are considered to be able to affect the hydrocyclone classification.The misplacement of coarse plate-like particles in the hydrocyclone and cyclosizer tests could be ascribed to the particle shape effects.

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“…In the Fig. 12, there are no obvious 13 differences in the slopes of the plots for the three size fractions of quartz.…”

Section: (42)mentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Effect of particle shape on hydrocyclone classification

et al. 2012

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“…Several investigations of the gravitational settling of different‐shape particles have been done . There are a few studies on the effects of the particle shape on the performance of hydrocyclones , , , and the hydrocyclone has been introduced as a potential device for particle classification based on their shape .…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Separation of Different‐Shape Particles Using a Mini‐Hydrocyclone

2017

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The separation efficiency from water of different-shape particles was studied experimentally using a mini-hydrocyclone. Spherical and flaky (plate-like) aluminum particles with the same particle size distributions were employed. Also, the effects of the feed flow rate and the temperature on the separation performance were studied. The results were investigated in terms of slurry recovery, total efficiency, and partition curves. The separation efficiency of the spherical particles increased with increasing particle size, temperature, and feed flow rate, as expected. The fishhook effect, as a noticeable phenomenon, was observed for the spherical particles. In case of the flaky particles, the separation showed an unusual behavior: The separation efficiency decreased with increasing particle size in the largest particle fraction, which has so far not been reported and addressed in this way.

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“…[8] Tsakalakis et al measured the settling velocity of irregularly shaped galena and quartz particles over 0.1 mm in water. [9] Tran-Cong et al measured the settling of agglomerates having six different geometries from smooth glass spheres in water-glycerin solutions. An extension to Schiller and Naumann drag law for irregular shapes and moderate Reynolds numbers is also presented.…”

Section: Introductionmentioning

confidence: 99%

Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

Gökelma

Einarsrud

Tranell

et al. 2020

Metall Mater Trans B

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The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to remove inclusions and the settling characteristic of particles is one of the most important parameters determining the removal efficiency. The settling characteristics can be modeled analytically through different approaches. A comparison of settling according to the Stokes and Schiller and Naumann drag force formulations was investigated and showed that Stokes drag is relevant for inclusions in aluminum melts. The settling of particles is analytically and experimentally investigated in this study by using a shape factor “K” based on Stokes law and online particle tracking by LiMCA (Liquid Metal Cleanliness Analyzer), respectively. The effect of the shape factor on settling velocities was observed clearly and the measured data show considerably slower settling than traditional models, indicating the effect of melt flow due to thermal convection.

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Prediction of the settling velocity of irregularly shaped particles

Cited by 24 publications

References 2 publications

Effect of particle shape on hydrocyclone classification

Effect of particle shape on hydrocyclone classification

A Comparative Study on the Separation of Different‐Shape Particles Using a Mini‐Hydrocyclone

Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

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