Centrifugal drum filtration: I. A compression rheology model of cake formation

Barr, John D.; White, Lee R.

doi:10.1002/aic.10678

Cited by 23 publications

(13 citation statements)

References 23 publications

(39 reference statements)

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“…The above tensor equations have been subsequently formulated in one-dimensional Cartesian coordinates and solved using appropriate boundary conditions for batch sedimentation [11,24], continuous thickening [23], batch filtration [12,25], gravitational filtration [9], one-dimensional drying [26] and tubular centrifugation [11,27]. Radial coordinates have been used for batch centrifugation [28], continuous centrifugation [29] and centrifugal filtration [10]. The continuous thickening and centrifugation models have been extended to pseudo two-dimensional models using an area averaged approach [23,28].…”

Section: Theorymentioning

confidence: 99%

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Whither compressional rheology?

Stickland

Buscall²

2009

Journal of Non-Newtonian Fluid Mechanics

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Section: Theorymentioning

confidence: 99%

“…The point is that the choice is unimportant so long as the load is not removed, as it is not in some instances like gravitational [9] or centrifugal [10] filtration, for example. The acid test of course is to remove the load and determine the elastic recovery.…”

Section: Introductionmentioning

confidence: 98%

Whither compressional rheology?

Stickland

Buscall²

2009

Journal of Non-Newtonian Fluid Mechanics

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“…The sediment angle decreases with lower separation efficiency, because the particles settle along the entire length of the rotor. 4 If the cut size of the centrifuge exceeds the mean particle size of the dispersed solids, the sediment angle tends to be less than 10 . These effects are not captured by the previously published model by Stahl et al and the error of the existing model increases significantly due to the disagreement between assumed and observed sediment profile.…”

Section: Introductionmentioning

confidence: 98%

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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“…The receding fluid front approach has been used to model consolidation and drainage during drying 11,12 and centrifugal filtration of suspensions. 7,8 This continuum description of desaturation is how a particulate network would be expected to behave provided that the network structure that governs the desaturation is the same as that which governs the saturated cake formation and consolidation. However, it does not consider the two-and three-dimensional effects on the desaturating body of cracking or wall detachment, which can be vitally important for predicting the rate and extent of dewatering, nor fluid movement through the desaturated body due to gravitational drainage or percolation.…”

Section: Introductionmentioning

confidence: 99%

“…As a first step, this theoretical work presents a one-dimensional mathematical model for vacuum and centrifugation [6][7][8] for flocculated slurries. In particular, the filtration model of Landman and White 9 is used here to describe the saturated processes of cake formation and cake consolidation.…”

Section: Introductionmentioning

confidence: 99%

One‐dimensional model of vacuum filtration of compressible flocculated suspensions

2010

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This work details the one-dimensional modeling of the different processes that may occur during the vacuum filtration of compressible flocculated suspensions. Depending on the operating conditions of the applied pressure and the initial solids concentration relative to the material properties of the compressive yield stress and the effective capillary pressure at the air-liquid interface, the dewatering process undergoes a combination of cake formation, consolidation, and/or desaturation. Mathematical models for these processes based on the compressional rheology approach are presented and appropriate solution methods outlined. Results using customary material properties are given for different operating conditions to illustrate the three dewatering processes. This approach lays the theoretical basis for further work understanding two-and three-dimensional effects during desaturation, such as cracking and wall detachment.

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Centrifugal drum filtration: I. A compression rheology model of cake formation

Cited by 23 publications

References 23 publications

Whither compressional rheology?

Whither compressional rheology?

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

One‐dimensional model of vacuum filtration of compressible flocculated suspensions

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