Journal ArticleDOI
Effects of microstructure on the compressive yield stress
TLDR
In this paper, the effects of microstructure on the compressie properties of aggregated alumina suspensions are determined by intentionally introducing heterogeneities into the suspen- sion.Abstract:
The effects of microstructure on the compressie properties of aggregated alumina suspensions are determined by intentionally introducing heterogeneities into the suspen- sion. Suspensions are prepared at a higholume fraction and diluted with low shear hand mixing to a series of initial concentrations. As the initial concentration is in- creased, larger heterogeneities are introduced, and the suspension becomes more com- pressible relatie to the compressie yield stress of the uniform suspension. A simple model is proposed in which the heterogeneous suspensions compress by rearrangement ( of the dense aggregates until a critical concentration f , which coincides with the c ) ¤olume fraction prior to dilution is reached. Aboe f , the suspensions consolidate c ( identically to the uniform suspension. With a single fitting parameter the size of the ) heterogeneities , the model shows semiquantitatie agreement with the experimental data.read more
Citations
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Compressive Strength and Capillary Pressure: Competing Properties of Particulate Suspensions that Determine the Onset of Desaturation
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Consolidation of concentrated suspensions – shear and irreversible floc structure rearrangement
TL;DR: In this article, a mathematical model for a consolidation process of a highly concentrated, flocculated suspension is developed, where the suspension is treated as a mixture of a fluid and solid particles by an Eulerian two-phase fluid model.
Consolidation and Structure of Paper Coating and Fibre Systems
TL;DR: In this article, several approaches have been used in order to study the consolidation of paper coatings before and afterapplication to substrates, including rheometry, centrifugation with NMR-imaging, scanning electronmicroscopy (SEM) and atomic force microscopy (AFM).
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Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification
TL;DR: In this article, a model for design of a thickener for solid-liquid separation where the flocs or aggregates within the solid liquid suspension undergo an aggregate densification process due to the action of rakes is presented.
References
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Journal ArticleDOI
The consolidation of concentrated suspensions. Part 1.—The theory of sedimentation
Richard Buscall,Lee R. White +1 more
TL;DR: In this paper, the concentration or consolidation of suspensions of fine particles under the influence of a gravitational field has been analyzed and a constitutive equation is suggested for irreversibly flocculated suspensions undergoing consolidation which embodies the concept of a concentration-dependent yield stress Py(ϕ).
Journal ArticleDOI
Scaling behaviour of the rheology of aggregate networks formed from colloidal particles
TL;DR: The instantaneous shear modulus G and compactive strength Py of aggregate networks formed from silica particles with a mean diameter of 26 nm have been determined as a function of particle concentration as mentioned in this paper.
Journal ArticleDOI
Consolidation Behavior of Flocculated Alumina Suspensions
Lennart Bergström,Lennart Bergström,Christopher H. Schilling,Christopher H. Schilling,Ilhan A. Aksay,Ilhan A. Aksay +5 more
TL;DR: In this paper, the consolidation behavior of flocculated alumina suspensions has been analyzed as a function of the interparticle energy, and it has been shown that strongly attractive interactions result in a particle network which resists consolidation and shows compressible behavior over a large stress range.
Journal ArticleDOI
Solid/liquid separation of flocculated suspensions
Kerry A. Landman,Lee R. White +1 more
TL;DR: In this paper, a generalized approach to understand and prediction of solid-liquid separation methods based on the measurement of fundamental material properties is reviewed and applied to a variety of thickening and filtration processes.
Journal ArticleDOI
Shear and compressive rheology of aggregated alumina suspensions
TL;DR: In this article, the shear and compressive properties of aggregated alumina particles are determined as functions of volume fraction and the strength of the interparticle attraction, and the links between compressive and shear properties are well described by linear elastic models where the Py and τy are a function of Poisson's ratio which, for the suspensions investigated, has a value near 0.49.
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The consolidation of concentrated suspensions. Part 1.—The theory of sedimentation
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