Simulations of magnetorheological suspensions in Poiseuille flow

Pappas, Yannis; Klingenberg, Daniel J.

doi:10.1007/s00397-005-0016-8

Cited by 33 publications

(30 citation statements)

References 21 publications

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“…Thus, an understanding of the microstructures that form is crucial to predicting the mechanical performance of devices utilizing ER fluids. In shear mode, shear-induced lamellar structures are known to form, while in flow mode, the suspension microstructure tends to contain clusters and aggregates [7][8][9]. In addition, an enhancement in the shear yield strength has been shown in magnetorheological fluids as the fluid is compressed in the direction orthogonal to shear [10] and a strengthening of the microstructure of ER fluids has also been shown in squeeze mode by Tian et al [11].…”

Section: Introductionmentioning

confidence: 79%

Yield Hardening of Electrorheological Fluids in Channel Flow

et al. 2016

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Electrorheological fluids offer potential for developing rapidly actuated hydraulic devices where shear forces or pressure-driven flow are present. In this study, the Bingham yield stress of electrorheological fluids with different particle volume fractions is investigated experimentally in wall-driven and pressuredriven flow modes using measurements in a parallel-plate rheometer and a microfluidic channel, respectively. A modified Krieger-Dougherty model can be used to describe the effects of the particle volume fraction on the yield stress and is in good agreement with the viscometric data. However, significant yield hardening in pressure-driven channel flow is observed and attributed to an increase and eventual saturation of the particle volume fraction in the channel. A phenomenological physical model linking the densification and consequent microstructure to the ratio of the particle aggregation time scale compared to the convective time scale is presented and used to predict the enhancement in yield stress in channel flow, enabling us to reconcile discrepancies in the literature between wall-driven and pressure-driven flows.

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Section: Introductionmentioning

confidence: 79%

Yield Hardening of Electrorheological Fluids in Channel Flow

et al. 2016

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“…For the calculation of hydrodynamic forces both Pappas and Klingenberg [37] and Lindner et al [39] use a Stokes drag term that is included in the DEM calculation. In contrast, Han et al [36] use an LBM-DEM framework similar to that described in Sects.…”

Section: Electromagnetic Suspensionsmentioning

confidence: 99%

“…The first, and the one utilised for this study, is the particles carrying a charge and thus interacting with the electromagnetic field via the Lorentz force equation [33][34][35]. The second, is to model particles of a magnetisable material that, upon application of an electromagnetic field, experiences a force between particles due to magnetic dipole interactions [36][37][38][39].…”

Section: Numerical Modelling Of Charged Particles In Electromagnetic mentioning

confidence: 99%

Electromagnetic excitation of particle suspensions in hydraulic fractures using a coupled lattice Boltzmann-discrete element model

et al. 2015

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This paper describes the development of a computational framework that can be used to describe the electromagnetic excitation of rigid, spherical particles in suspension. In this model the mechanical interaction and kinematic behaviour of the particles is modelled using the discrete element method, while the surrounding fluid mechanics is modelled using the lattice Boltzmann method. Electromagnetic effects are applied to the particles as an additional set of discrete element forces, and the implementation of these effects was validated by comparison to the theoretical equations of point charges for Coulomb's law and the Lorentz force equation. Oscillating single and multiple particle tests are used to investigate the sensitivity of particle excitation to variations in particle charge, field strength, and frequency. The further capabilities of the model are then demonstrated by a numerical illustration, in which a hydraulic fracture fluid is excited and monitored within a hydraulic fracture. This modelling explores the feasibility of using particle vibrations within the fracture fluid to aid in the monitoring of fracture propagation in unconventional gas reservoirs.

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“…The main two differences from the model used in [4] are: 1) the use of a more accurate description of hydrodynamic interactions between neighbor particles and 2) the shear flow being studied instead of a plane Poiseuille flow.…”

Section: Introductionmentioning

confidence: 99%

“…Pappas and Klingenberg [4] explain the processes inside a MR suspension by direct numerical simulation as a tool for studies of particle systems in a fluid flow the hydrodynamic interactions being limited to the Stokes drag and hydrodynamic interaction between nearly contacting particles neglected. Magnetized particles are represented by constant point-like magnetic dipoles.…”

Section: Introductionmentioning

confidence: 99%

Direct Numerical Simulation of Motion of Ferromagnetic Particles in Magnetorheological Suspension

Lacis

Gosko

2008

Integrated Ferroelectrics

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Results simulation of magnetorheological suspension at particle level are reported. The present approach accounts for a better description of hydrodynamic interaction between close spheres. Development of lamellar structures similar to those obtained by other researchers in Poiseuille flow is observed in shear flow. Studies of single layer lamellar structures reveal presence of short chains and more complex aggregates.

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Simulations of magnetorheological suspensions in Poiseuille flow

Cited by 33 publications

References 21 publications

Yield Hardening of Electrorheological Fluids in Channel Flow

Yield Hardening of Electrorheological Fluids in Channel Flow

Electromagnetic excitation of particle suspensions in hydraulic fractures using a coupled lattice Boltzmann-discrete element model

Direct Numerical Simulation of Motion of Ferromagnetic Particles in Magnetorheological Suspension

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