Mechanisms Dispersive and Convective Mixing

Mixing Mechanisms Dispersive and Convective Mixing The mixing process can be observed in diagrammatic form as an over-... 

The axial dispersion coefficient [cf. Eq. (16-51)] lumps together all mechanisms leading to axial mixing in packed beds. Thus, the axial dispersion coefficient must account not only for molecular diffusion and convective mixing but also for nonuniformities in the fluid velocity across the packed bed. As such, the axial dispersion coefficient is best determined experimentally for each specific contactor. 

For tumbling mixers, there are three main mechanisms for mixing convective mixing, shear mixing, and dispersive or diffusive mixing. " All three mechanisms are present to some extent in free-fall mixers. During scale-up, as the batch size is increased, so are the forces (gravitational, convective, and shear) that... 

There are different types of mixing mechanisms namely extensive and dispersive (intensive) in compounding [1,2]. Composition uniformity from compounding comes from extensive mixing. The mixing of very viscous polymer systems is largely achieved by convection, which may be laminar or distributive in nature. 

Bas-relief micromixers induce transversal motion, when miscible liquids are considered, to mix by convection [92,93]. In the gas-liquid case to be considered here, the mechanism for bubble formation is yet unclear, but likely related to shear forces coming from a similar liquid motion in the dispersed flow. Caterpillar mixers induce such transversal motion by ramp-like microstructures, lifted up and down, placed in one channel at the bottom and ceiling [4] (see also Ref. [S6]). Caterpillar mixers were developed as family of devices with grouped capacity using smart enlargement of the internal chaimel and have high volume flows, for example,... 

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