Passive Micro mixers

Hardt, S., Drese, K. S., Hessel, V., Schonfeld, F., Passive micro mixers for applications in the micro reactor and pTAS field, in Proceedings of the 2nd International Conference on Microchannels and Minichannels (17-19 June 2004), Rochester, NY, 2005, in print. 

The use of the Coanda effect is based on the desire to have a second passive momentum to speed up mixing in addition to diffusion [55, 163], The second momentum is based on so-called transverse dispersion produced by passive structures, which is in analogy with the Taylor convective radial dispersion ( Taylor dispersion ) (see Figure 1.180 and [163] for further details). It was further desired to have a flat ( in-plane ) structure and not a 3-D structure, since only the first type can be easily integrated into a pTAS system, typically also being flat A further design criterion was to have a micro mixer with improved dispersion and velocity profiles. 

Hessel, V., Lowe, H., Micro mixers-a review on passive and active mixing priciples, Chem. Eng. Sci. 2005, in print. 

Distinguish between passive and active micro mixers. List three examples in each case. (6 marks)... 

Passive Micromixers, Fig. 3 (a) The front face of the micro T-mixer test chip, (b) The back face of the micro T-mixer [5]... 

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