Simulation of particles settling in power-law fluids by combined lattice Boltzmann-smoothed profile methods |
| |
| Authors: | Hamideh Rouhani Tazangi Ataallah Soltani Goharrizi Ebrahim Jahanshahi Javaran |
| |
| Institution: | Department of Chemical Engineering,Shahid Bahonar University of Kerman,Kerman,Iran;Department of Mechanical Engineering,Shahid Bahonar University of Kerman,Kerman,Iran |
| |
| Abstract: | In the current study, the settling, interaction, drafting, kissing, and tumbling of two identical and non-identical circular particles were simulated in a two-dimensional box in shear-thinning, Newtonian, and shear-thickening fluids by using the combined lattice Boltzmann-smoothed profile methods. Furthermore, the drag coefficient of one particle settling for different power-law indexes and Archimedes numbers was calculated. Also, the effect of the diameter ratio of the two particle pairs was considered during settling. The developed method was validated by simulating the settling of one particle and two identical particles in a Newtonian fluid. To consider two non-identical particles, two cases were examined. In Case A, the larger particle was above the smaller one and in the Case B, the smaller particle was above the larger one. The results showed that the two non-identical particles were separated more easily than the identical ones. In the settling of two particles under the same Archimedes number, the drafting and kissing time considerably increased by changing the non-Newtonian fluid behavior from a shear-thinning one to a shear-thickening one. Also, when the larger particle was above the smaller one, the time duration of the kissing stage increased with the decrease in the diameter ratio. |
| |
| Keywords: | Lattice Boltzmann method Smoothed profile method DKT phenomenon Power-law fluids Particulate flow Drag coefficient |
| 本文献已被 万方数据 ScienceDirect 等数据库收录！ |
|
