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. 2016 Dec 19;6:38809. doi: 10.1038/srep38809

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Copyright © 2016, The Author(s)

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(a) Simulated velocity profile in the transition region and the forces acting on the particles where focusing occurs near the centreline. (b) Proportional Dean flow vectors with zero Dean velocity lines for particle positions 1, 3 and 5. (c) Simulated velocity profile in the transition region and the forces acting on the medium particles where transverse motion is observed. Dominant forces acting on the particles are F_S (shear gradient lift force), F_D (Dean drag force) and F_W (wall-induced lift force).