2.2 Passive Micromixers
29
Fig. 2.19 Micromixer with circular mixing chambers [55]: a Schematic diagram of the two regions
in the chamber, main flow (M) and circulation, b calculated velocity field, and c streamlines in the
mixer with the circular chamber at Re equals (left) 10 and (right) 300
(stretching, folding and splitting, reorientation and recombination) resulted in significant improvement in mixing performance for both models A and B compared to a
simple 3D serpentine microchannel. In the proposed micromixers, chaotic advection
was observed even at low Reynolds numbers much less than 1.
A 3D SAR micromixer composed of O- and H- shaped units shown in Fig. 2.21
was proposed, and numerically investigated by Hossain and Kim [57]. The split and
recombination of fluid streams due to repeated O- and H-shaped units along the
channel length promoted chaotic advection, and improved mixing performance. For
Re ≥ 30, the micromixer with ten O- and H-units showed complete mixing at the exit
of the channel. In a later study, Raza et al. [58] proposed a 3D serpentine crisscross
29
Fig. 2.19 Micromixer with circular mixing chambers [55]: a Schematic diagram of the two regions
in the chamber, main flow (M) and circulation, b calculated velocity field, and c streamlines in the
mixer with the circular chamber at Re equals (left) 10 and (right) 300
(stretching, folding and splitting, reorientation and recombination) resulted in significant improvement in mixing performance for both models A and B compared to a
simple 3D serpentine microchannel. In the proposed micromixers, chaotic advection
was observed even at low Reynolds numbers much less than 1.
A 3D SAR micromixer composed of O- and H- shaped units shown in Fig. 2.21
was proposed, and numerically investigated by Hossain and Kim [57]. The split and
recombination of fluid streams due to repeated O- and H-shaped units along the
channel length promoted chaotic advection, and improved mixing performance. For
Re ≥ 30, the micromixer with ten O- and H-units showed complete mixing at the exit
of the channel. In a later study, Raza et al. [58] proposed a 3D serpentine crisscross