Fig. 6: Particle trajectories for different confinement values χ.

a–d Top views and e–h outlet views. The initial particle position is a, e \(({\hat{x}}_{0},{\hat{z}}_{0})=(0.0033,-0.31)\), b, f \(({\hat{x}}_{0},{\hat{z}}_{0})=(0.0033,0.31)\), c, g \(({\hat{x}}_{0},{\hat{z}}_{0})=(0.15,-0.31)\) and d, h \(({\hat{x}}_{0},{\hat{z}}_{0})=(0.15,0.31)\). The trajectories in e–h are shown up to the point where the particle reaches the outlet channel at \(\hat{x}=1\)