FIG. 14.

(a) Time-lapse images illustrating progressive trapping and enrichment of 20 μm particles in a 500 × 400 μm² cavity.⁵⁵ Reproduced with permission from Zhou et al., Microfluid. Nanofluid. 15, 611–623 (2013). Copyright 2013 Springer Nature. The effects of cavity length (b) and width (c) on the maximum number of entrapped particles (N_p) in a pair of cavities under Re of 50–300.⁵⁶ The cavity width in (b) was fixed at Wc = 310 μm, and the cavity length in (c) was fixed at in Lc = 930 μm. Reproduced with permission from Haddadi et al., J. Fluid Mech. 811, 436–467 (2017). Copyright 2017 Cambridge University Press. (d) Snapshots of captured particles in round and rectangular cavities at the Re of 316, 366, and 433. $N_1$ and $N_2$ represent the maximum numbers of particles held in the round and rectangular cavities, respectively.⁵⁷ The scale bar is 100 μm. (e) Comparison of the N_p in round and rectangular cavities.⁵⁷ Reproduced with permission from Shen et al., Phys. Fluids 33, 082002 (2021). Copyright 2021 AIP Publishing LLC.