Coupled dynamics of flow, microstructure, and conductivity in sheared suspensions

Olsen, Tyler; Helal, Ahmed; McKinley, Gareth H.; Kamrin, Kenneth N

doi:10.1039/c6sm01199c

Cited by 9 publications

(5 citation statements)

References 49 publications

(59 reference statements)

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“…To further characterize the microstructure of a suspension, we employ the fabric tensor concept, which was originally introduced for the contact network of granular materials. 48,49 The fabric tensor A p can be computed at the particle level using the following expression, 31,50,51 where N b is the number of the particles in contact, n i is the unit vector connecting the center of a particle to the center of its i th bond neighbors, and ⊗ denotes the dyadic product. The system-sized fabric tensor A can be then derived by averaging the particle-level fabric tensors over the particle ensemble,…”

Section: Resultsmentioning

confidence: 99%

Multiscale nature of electric-field-induced structural formations in non-colloidal suspensions

Mirfendereski

Park

2022

Soft Matter

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Section: Resultsmentioning

confidence: 99%

Multiscale nature of electric-field-induced structural formations in non-colloidal suspensions

Mirfendereski

Park

2022

Soft Matter

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“…Such anisotropic conductivity induced by shear has been studied previously using random computer-generated particle suspension networks. 48,49 We also count the number of particles in all clusters and calculated the percentage of particles involved in a cluster family, including the isolated single particles for reference. The result is plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Computational Modeling of Particle Hydrodynamics and Charging Process for the Flowable Electrodes of Carbon Slurry

Karzar-Jeddi

Luo

Cummings

et al. 2019

J. Electrochem. Soc.

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Slurry of activated carbon particles mixed with an aqueous electrolyte solution has been used as "flowable electrode" in a few recent electrochemical systems, e.g., electrochemical flow capacitors (EFCs) for energy storage, and flow-electrode capacitive deionization (FCDI) for water treatment. In these applications, the porous carbon particles with very large specific surface area adsorb ions from the electrolyte and meanwhile store electrical charges when a voltage source is added in the charging process. Under the flow condition, the motion of the particles and their mutual contact form a dynamically varying electrical network for the charge transport through the bulk material. We introduce a novel particle-based computational model using the Stokesian dynamics to simulate the hydrodynamic interaction of the carbon particles and the charge transport. An analogous electrical circuit model is developed by approximating the particles with many interconnected resistor-capacitor units, and the circuit's topology is temporally changing depending on the instantaneous particle configuration. The Stokesian model and the circuit model are solved simultaneously to study how the hydrodynamic interaction and cluster formation affect the charge transport process of the slurry. The presence of the stationary current collector can be included to incorporate the near-wall effects on particle mobility. In the simulation, we vary the particle concentration as well as the ratio of the particle charging time to the hydrodynamic interaction time. The results shows that the charge transport in the carbon slurry is enhanced by increasing the concentration of the particles and faster particle charging. In addition, cluster formation of the particles plays an important role for the electronic transport process. After scaling, the transient electrical current from the present study generally agrees with that from previous experimental and modeling studies.

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“…Examples include polymer processing of highly-filled viscoelastic melts and elastomers [1], the processing of semi-solid conductive flow battery slurries [2], the flow-induced migration of circulating cancer cells in biopolymeric media such as blood [3], magma eruption dynamics [4], and hydraulic fracturing operations using solids-filled muds, slurries and foams [5,6].…”

Section: Introductionmentioning

confidence: 99%

Finite volume simulations of particle-laden viscoelastic fluid flows: application to hydraulic fracture processes

Fernandes

Faroughi

Ribeiro

et al. 2022

Engineering with Computers

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Accurately resolving the coupled momentum transfer between the liquid and solid phases of complex fluids is a fundamental problem in multiphase transport processes, such as hydraulic fracture operations. Specifically we need to characterize the dependence of the normalized average fluid-particle force F on the volume fraction of the dispersed solid phase and on the rheology of the complex fluid matrix, parameterized through the Weissenberg number W i measuring the relative magnitude of elastic to viscous stresses in the fluid. Here we use direct numerical simulations (DNS) to study the creeping flow (Re ≪ 1) of viscoelastic fluids through static random arrays of monodisperse spherical particles using a finite volume Navier-Stokes/Cauchy momentum solver. The numerical study consists of N = 150 different systems, in which the normalized average fluid-particle force F is obtained as a function of the volume fraction φ (0 < φ ≤ 0.2) of the dispersed solid phase and the Weissenberg number W i (0 ≤ W i ≤ 4). From these predictions a closure law F (W i, φ) for the drag force is derived for the quasi-linear Oldroyd-B viscoelastic fluid model (with fixed retardation ratio β = 0.5) which is, on average, within 5.7% of the DNS results. Additionally, a flow solver able to couple Eulerian and Lagrangian phases (in which the particulate phase is modeled by the discrete particle method (DPM)) is developed, which incorporates the viscoelastic nature of the continuum phase and the closed-form drag law. Two case studies were simulated using this solver, in order to assess the accuracy and robustness of the newly-developed approach for handling particle-laden viscoelastic flow configurations with O(10 5 − 10 6 ) rigid spheres that are representative of hydraulic fracture operations. Three-dimensional settling processes in a Newtonian fluid and in a quasi-linear Oldroyd-B viscoelastic fluid are both investigated

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Coupled dynamics of flow, microstructure, and conductivity in sheared suspensions

Cited by 9 publications

References 49 publications

Multiscale nature of electric-field-induced structural formations in non-colloidal suspensions

Multiscale nature of electric-field-induced structural formations in non-colloidal suspensions

Computational Modeling of Particle Hydrodynamics and Charging Process for the Flowable Electrodes of Carbon Slurry

Finite volume simulations of particle-laden viscoelastic fluid flows: application to hydraulic fracture processes

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