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Simulations of agitated dilute non-Newtonian suspensions
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- Author / Creator
- Sekyi, Elorm
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Particle distribution and settling in suspensions with non-Newtonian liquids agi-
tated with a Rushton turbine in a lab-scale tank have been studied. The rheology
of the non-Newtonian liquids can be described by the power-law, Bingham and
Herschel-Bulkley fluid models. The dynamics of the dispersed phase – settling
particles (size 0.65mm) is modeled by a Lagrangian tracking approach while the
liquid phase is resolved by the lattice-Boltzmann method.
Qualitative insight emerging from exploration of shear-thinning/thickening, New-
tonian, yield-stress fluid models at Reynolds number, Re=6 × 103 , 8.5 × 103 and
1.25 × 104 indicate that bottom particle concentration is highest in power-law liq-
uids than in Newtonian; while yield stress fluids had more uniform particle con-
centration and least bottom concentration. Also, turbulent kinetic energy and vis-
cous dissipation are highest in the Newtonian liquid. Extra viscous diffusion due
to fluctuating non-Newtonian viscosity in the turbulent kinetic energy equation
attributes to these differences. -
- Subjects / Keywords
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- Graduation date
- Fall 2009
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.