Coanda Tesla structures

Relying on the knowledge of flow pattern generated by the Coanda effect inplane micro valves and micro pumps, it was envisaged to transfer this technique to a micro-mixer device [55], In the latter case, using a Tesla structure (see [163] for geometric details), the flow is redirected and collision of streams occurs. 

Mixer 87 [M 87] Coanda-effect Micro Mixer with Tesla Structures... 

Mixer type Coanda-effect micro mixer with Tesla structures Angle of turn for the main passage 90°... 

M 87] [P 77] Simulations show that, as intended, transverse dispersion is achieved at the Coanda structure and mixing is completed after passing four Tesla structures (see Figure 1.183 and 1.184) [163],... 

Another interesting planar structure able to induce chaotic advection has been reported by Hong et al. [126] (Fig. lid). This micromixer comprised a modified tesla structure that redirected the streams, by exploiting the Coanda effect. The authors demonstrated an efficient mixing at relative low Re number Re < 10). 

One of the promising designs is the modified Tesla structures [46]. It uses the Coanda effect to split part of the fluid stream and direct it so that it recombines with the opposing flow of the other part of the stream. Coanda effect micromixer relies on the redirection of a flow by a special guiding structure that creates new interfaces within the flow [47]. This special passive structure provides good mixing at low flow rates. In this way the Coanda mixer can also be seen as a special realization of the SAR approach using recycle flows [32]. 

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