Simulation of deformation and breakup of large aggregates in flows of viscous fluids

Higashitani, Ko; Iimura, Kenji; Sanda, Hiroko

doi:10.1016/s0009-2509(00)00477-2

Cited by 169 publications

(149 citation statements)

References 34 publications

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“…Hence, the internal bonds within the aggregate could play a very significant role to regulate the breakage dynamics. Higashitani et al [39] developed a three-dimensional modified discrete element method to simulate the deformation and breakup process of large aggregates in a shear flow. In their model, the hydrodynamic drag force exerted on the surface and propagation of the interaction within the aggregate was considered.…”

Section: Effect Of the Internal Bonds On Aggregate Breakagementioning

confidence: 99%

Modeling particle-size distribution dynamics in a shear-induced breakage process with an improved breakage kernel: Importance of the internal bonds

Xiao

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Effect Of the Internal Bonds On Aggregate Breakagementioning

confidence: 99%

Modeling particle-size distribution dynamics in a shear-induced breakage process with an improved breakage kernel: Importance of the internal bonds

Xiao

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…We mention the work of Gmachowski [17] as he proposes a new approach of the aggregation modelling by considering an aggregation act for which the fractal dimension can vary along the process. The master equation is the following: Higashitani et al [20] present a three dimensional discrete element method (DEM) to simulate the deformation and break-up of large aggregates in flowing viscous fluid (dynamic viscosity µ). They take into account the Van der Waals forces between submicronic primary particles, the drag forces acting on the particle surface exposed directly to the flow, and the elastic interaction between primary particles inside the aggregate.…”

Section: Simulationsmentioning

confidence: 99%

Modelling of aggregate restructuring in a weakly turbulent flow

Gruy

2012

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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To cite this version:Frédéric Gruy.Modelling of aggregate restructuring in a weakly turbulent flow. AbstractAn aggregate may undergo a restructuring that leads to a change of its porosity. The cause of this morphology change is not only the colloidal forces between the primary particles but also the interaction between the primary particles and the flowing fluid. We investigate in this paper the restructuring of the aggregates with Van der Waals forces between the primary particles in the presence of the Brownian motion and a weakly turbulent flow. The motion of all the primary particles constituting the aggregate is studied thanks to a 1-D model based on the work of G. Narsimhan [Model for drop coalescence in a locally isotropic turbulent flow field, J. of Colloid & Interface Science, 272(2004)197-209]. A shrinking rate law, i.e. aggregate porosity versus time, is proposed after a transition to a 3-D model. Its characteristic time depends on the initial porosity, the number of primary particle and a characteristic time at the scale of the primary particle.

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“…The Brownian motion is neglected [4,7]. A model is described in [10] that looks at the hydrodynamic and interparticular forces in more detail. Upon the assumption that Stokesian friction takes effect on the particles, the frictional force is overestimated.…”

Section: Introductionmentioning

confidence: 99%

“…This is especially the case for those particles which are completely surrounded by other particles. It is assumed that the hydrodynamic frictional force only takes effect on the particle surface which is directly exposed to the liquid [10]. The interparticular forces are obtained by DLVO theory [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…It has found wide use in the modeling of granular solids with the help of the Discrete Element Method (DEM) [16]. By these assumptions, among other things, the deformation of three-dimensional aggregates is simulated, e.g., in [4,10,17,18]. Furthermore, the consolidation of gel fragments is simulated by statistical methods, such as the Monte Carlo method.…”

Section: Introductionmentioning

confidence: 99%

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Experimentally Justified Model-Like Description of Consolidation of Precipitated Silica

Sahabi

Kind

2011

Polymers

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Abstract:Colloidal gels are intermediates in the production of highly porous particle systems. In the production process, the gels are fragmented after their creation. These gel fragments consolidate to particles whose application-technological properties are determined by their size and porosity. A model of the consolidation process is proposed: The consolidation process of a gel fragment is simulated with the Molecular Dynamics (MD) method with the assumption of van der Waals forces in interplay with the thermal motion as driving forces for the consolidation. The simulation results are compared with experimental data and with a Monte Carlo (MC) simulation.

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Simulation of deformation and breakup of large aggregates in flows of viscous fluids

Cited by 169 publications

References 34 publications

Modeling particle-size distribution dynamics in a shear-induced breakage process with an improved breakage kernel: Importance of the internal bonds

Modeling particle-size distribution dynamics in a shear-induced breakage process with an improved breakage kernel: Importance of the internal bonds

Modelling of aggregate restructuring in a weakly turbulent flow

Experimentally Justified Model-Like Description of Consolidation of Precipitated Silica

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