Abstract
The flow and resulting drag force in suspensions consisting of monodisperse, solid spheres, and non-Newtonian liquids have been studied via direct numerical simulations. The liquids are purely viscous (i.e., nonelastic) with shear thinning and/or thixotropic (time-dependent) behavior. The configuration of spheres is static. The interstitial liquid flow is solved by means of the lattice-Boltzmann method. Only creeping flow conditions have been considered. Thixotropy enters via a network integrity parameter that relates to the local, apparent viscosity and for which a transport equation has been solved. The results show that the shear-thinning character of the liquid manifests itself more pronounced at higher solids volume fractions. Thixotropy tends to increase the drag force due to the decoupling of locations of high deformation rates and low viscosity. 0 2009 American Institute of Physics. [DOI: 10.1063/1.3200946]
Original language | English |
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Article number | 083302 |
Number of pages | 9 |
Journal | Physics of Fluids |
Volume | 21 |
Issue number | 8 |
DOIs | |
Publication status | Published - Aug 2009 |
Keywords
- LATTICE-BOLTZMANN SIMULATIONS
- REYNOLDS-NUMBER
- NUMERICAL SIMULATIONS
- BIDISPERSE ARRAYS
- FLUIDIZED BEDS
- FLOW
- SUSPENSIONS
- MONODISPERSE
- PARTICLES
- EQUATION