Abstract
This work presents a numerical study of the dynamics of a capsule in a contraction-expansion array microchannel filled with Newtonian and Oldroyd-B fluids by using an immersed boundary–lattice Boltzmann method (IB–LBM). Extensive simulations are conducted by considering the fluid viscoelasticity, the initial position of the capsule and the confinement. The capsule migration trajectories are discussed. It is found that the capsule focuses to different equilibrium trajectories at Wi = 0 (in a Newtonian fluid) and Br = 0.3 depending on the initial vertical position. In contrast, the capsule reaches the same equilibrium trajectory when the fluid viscoelasticity is included, indicating that the non-Newtonian rheology has strong effect on the capsule migration.
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