| 초록 |
In plane Poiseuille flow, neutrally buoyant concentrated and non-Brownian particles accumulate in mid-plane by shear-induced migration. Since the migration was first elucidated by Leighton and Acrivos (1987) that particles are migrated from high to low shear-rate region, many theoretical and experimental works have been carried out. However, very few studies on particle migration were found in the literature regarding more complex flow fields than simple Couette or Poiseuille flows. In this study, we investigate flow behavior and particle dynamics in suspensions under combined Couette and Poiseuille flows employing the Lattice Boltzmann method. Neutrally buoyant and non-Brownian particles suspended in a Newtonian fluid were considered, where their volume fraction was more than 0.3 and flows were driven by both external body force and shearing motion of plane walls. Our simulation results show that the particle-accumulated position can be shifted from mid-plane according to applied conditions. Moreover, at a certain condition suspended particles can be deposited on a boundary wall in crystal structures purely by hydrodynamic interactions. |
