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Lattice Boltzmann investigation of non-Newtonian fluid flow through a packed bed of uniform spheres
Ist Teil von
Powder technology, 2019-02, Vol.343, p.225-236
Ort / Verlag
Lausanne: Elsevier B.V
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Non-Newtonian fluid flows through packed beds are very common in many industries; however, our understanding of this flow system is very limited. In this paper, a parallel Lattice-Boltzmann (LB) model is applied to simulate the power-law fluid flows through a packed bed of porosity 0.366 on a sub-particle scale. The packed bed is generated by means of discrete element method. The flows cover wide ranges of Reynolds numbers (0.1 <Re < 500) and power-law indices (0.6 <n < 1.4). In total, seventy sets of LB simulations are conducted under well-controlled conditions. The results indicate that the internal fluid velocity distribution within the packed bed shows that the flow behaviors vary for different flow regions and fluids corresponding to various pore structures. Also, both viscosity and shear stress show significant differences in pore and near-particle regions. Because of these complicated flow characteristics, the submerged objects model is selected to formulate a drag correlation with least assumptions. The comparison of the new correlation with others against experimental data shows that the new one is more accurate. The present framework provides a sound base to investigate the fundamentals governing the behaviors of non-Newtonian fluid flow through packed beds under different conditions.
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•LB approach is applied to study non-Newtonian effects on flows through a packed bed.•Spatial and statistical distributions of velocity and other flow properties are examined.•Viscosity and shear stress show big differences between near-particle and pore regions.•A new correlation is proposed to estimate the mean drag force for non-Newtonian fluid flow.