Micromixing laminar

Micromixing Models. Hydrodynamic models have intrinsic levels of micromixing. Examples include laminar flow with or without diffusion and the axial dispersion model. Predictions from such models are used directly without explicit concern for micromixing. The residence time distribution corresponding to the models could be associated with a range of micromixing, but this would be inconsistent with the physical model. 

Hessel, V., Hardt, S Lowe, H., ScHONEELD, F., Laminar mixing in different interdigital micromixers - Part I Experimental characterization, AIChE... 

Figure 7.14 T-shaped micromixer showing the laminar and engulfment regimes...

Y. Yamaguchi, K. Yamashita, H. Maeda, K. Ogino, Rapid micromixing based on multilayer laminar flows, J. Chem. Eng. Jpn 37 (2004) 1265. 

Passive micromixers rely on the mass transport phenomena provided by molecular diffusion and chaotic advection. These devices are designed with a channel geometry that increases the surface area between the different fluids and decreases the diffusion path. By contrast, the enhancement of chaotic advection can be realized by modifying the design to allow the manipulation of the laminar flow inside the channels. The modified flow pattern is characterized by a shorter diffusion path that improves the mixing velocity. In this section, an overview of the different types of passive micromixers is provided. Mixed phase passive micromixers can be categorized as ... 

In a zig-zag micromixer [111], mixing is provided by laminar recirculation that induces trasverse velocity components localized at each channel angle. The micromixer studied had a critical Re number Re = 80), below which the mixing was solely due to molecular diffusion (see Fig. 11c). 

---