Effect of channel width on the sedimentation modes of a cold elliptical particle in hot narrow channels

• DOI: 10.1016/j.tsep.2022.101519
• Publication Date: 2022-10-26T17:14:22Z
• Authors: Amir Eshghinejad ...; Mohammad Khalili
• Keywords: Grashof number; Lattice Boltzmann methods; Particle (ecology); Settling

Many natural and industrial processes involve transport of solid particles. This research reports sedimentation modes a single cold elliptical particle with an aspect ratio 2 in narrow hot channels. Prior on settling non-isothermal particles was limited to wide vertical A constant non-dimensional temperature Tp∗=0 initial orientation θ0=π/3 between its major axis horizontal is released fluid. Fluid Prandtl number 7, Tf,0∗=1. Simulations are based in-house lattice-Boltzmann solver two distribution functions for fluid flow heat transfer using Boussinesq approximation low density variations. In total, 120 simulations five channel widths have been run, enough time the reach distinct sedimentation/rising pattern. Effects width (L=12A/13−38A/13), where ellipse diameter, Grashof (Gr=100−1000), particle-to-fluid (ρr=1.0003−1.3) studied. Channel width, gravity discovered cause travel up or down. Seven observed including i) at centerline, ii) inclined off-center, iii) center, iv) oscillatory motion around v) tumbling vi) fluttering vii) off-center oscillations. Three these patterns (iii, iv, peculiar channels, not previously elliptic channels (L=52A/13). Moreover, has seen move upward rather downward narrowest small ratios.