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Micromixing / Segregation

1. (X) Micro-Mixing and Segregation

2. (X) The 'second order' effect for segregated fluid reactions

*micro-mixing - as we define it in this course - should now first be explained

let us define:

Contrary to macro-mixing (contacting pattern) that describes the macroscopic mixing-effects in the reaction vessel as we could see it with our 'bare eyes', micro-mixing is a feature of the fluid: the fluid can either be mixed in a molecular dispersed manner (microfluid, e.g. salt solution, sugar solution etc.) or on the other hand it can be totally segregated ( macrofluid in english literature).
Segregation can be represented by different models:

• physicochemical: an emulsion, suspension or dispersion of microscopic 'particles' (droplets, bubbles, powders) where the particles do not interchange with each other ( no exchange of materials)
• hydrodynamic: a fluid containing microscopic packs of turbulence centers which do not exchange materials
• reaction engineering: infinitesimal crowd of micro-batch-reactors with 'closed' walls

recommended!!

look at two sketches for the visualization of molecular dispersed and segregated fluids In CSTR's !!

As it can not be expected that we find very often totally segregated systems in reality, we can postulate a degree of segregation, that means that 'coalescence' (i.e. interchange) takes place to a certain percentage

For the difference between our definitions and those that are found in international literature see: (overview)

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