Numerical investigation of multiscale lateral microstructures enhancing passive micromixing efficiency via secondary vortex flow

Passive micromixing can efficiently mix laminar flows through molecular and convective diffusion. Microstructures are expected to be efficient, easily integrated into micromixers, suitable for micromixers over a wide range of Re. This paper presents the enhancement effects multiscale lateral microstructures on flow field characteristics mixing efficiency numerical simulations at Re = 0.01–50. Inspired by regulation local field, cross-scale staggered baffles (CSBs) were established applied in typical passive micromixers. For low- conditions, paired trapezoidal (PTMs) CSBs improved effect increasing streamline tortuosity. high- PTMs increased number expanding vortices microchannel, which could increase size fluid interfaces, an optimal index with relatively little pressure drop was achieved. Moreover, serpentine curved channel, caused large inner side then state Dean cross section channel changed. Therefore, compared conventional micromixer structure, regulate streamlines secondary effects, have great potential improve