Mechanism of shear thickening in suspensions of rigid spheres in Boger fluids. Part II: Suspensions at finite concentration
| Autor: | Eric S. G. Shaqfeh, Mengfei Yang |
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| Rok vydání: | 2018 |
| Předmět: |
Dilatant
Materials science 010304 chemical physics Mechanical Engineering Constant Viscosity Elastic (Boger) Fluids Mechanics Immersed boundary method Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Shear (sheet metal) Viscosity Rheology Mechanics of Materials 0103 physical sciences Volume fraction Particle General Materials Science |
| Zdroj: | Journal of Rheology. 62:1379-1396 |
| ISSN: | 1520-8516 0148-6055 |
| DOI: | 10.1122/1.5024698 |
| Popis: | The steady shear rheology of nondilute suspensions of noncolloidal, rigid spheres in highly elastic, constant viscosity fluids is studied via numerical simulation using three-dimensional, finite-volume methods and via experiments using cone-and-plate measurements. In the numerical study, we use an immersed boundary method to simulate an ensemble of particles as a function of time until they achieve steady average bulk properties, and the simulations include fully resolved particle-scale hydrodynamics and fluid stresses. The simulations show that for low volume fraction, nondilute suspensions, the viscosity thickens at high shear and this effect can be fully determined by considering a single particle’s interactions with the suspending fluid. In fact, we show that experimentally measured viscosities of suspensions up to ϕ∼0.25, where ϕ is the volume fraction of particles, can be characterized by a shift factor that determines the zero-shear viscosity and a master curve that describes the viscosity thickeni... |
| Databáze: | OpenAIRE |
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