Taylor radial mixing

On the basis of the Taylor-Aris correlation (Equation 3.75) a Bodenstein number oiBo 24is expected. The experimental results suggest that efficient radial mixing occurs, which may be explained by the used capillary shaped as a coil provoking enhanced radial mixing. 

The wide applications of Taylor flow for reactions and separations come from its stability and ability to provide well-defined high specific interfacial area. The recirculation within the liquid slugs improves heat and mass transfer from liquid to wall and interfacial mass transfer from gas to liquid [26]. It reduces axial dispersion and enhances radial mixing. The radial mixing can further be enhanced using meandering channels as shown in Figure 7.6c [27]. 

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. 

For laminar flow in tubes the concept of axial mixing can be used to describe the combined effect of the velocity profile and radial diffusion. The following relation was derived from a theoretical basis by Taylor (1953) ... 

---