Abstract
Passive micromixers utilize no external energy input. It mainly depends on the structure change of microchannel to produce chaotic convection effect, which increases the contact surface and contact time between the fluid. The mixing efficiency of stagger non-abreast baffles (SNB) micromixer and stagger abreast baffles (SAB) micromixer is compared at five kinds of Reynolds (Res). It may affect the mixing efficiency including the height ([Formula: see text]) and number ([Formula: see text]) of baffles, the distance between two adjacent baffles, non-abreast baffles, and abreast baffles. As the [Formula: see text] of the baffles changes, it contributes to enhance the chaotic convection of the micromixer. When Re [Formula: see text], the worst mixing efficiency of the most efficient seven SABs ([Formula: see text], [Formula: see text] mm, [Formula: see text] mm, [Formula: see text]) micromixer reaches an astonishing 98%. The concentration change along the microchannel is studied in this paper. At low Re, SAB makes fluid contact zigzag in microchannel and enhances molecular diffusion. At high Re, SAB causes chaotic convection in the microchannel and completes the mixing quickly.
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