Micro level mixing - Chemical processing

Micro-level mixing topics deal almost entirely with liquid-gas (gas-liquid) mass transfer across a phase boundary, in this case through the gas bubbles. This category deals more with the rate of the mass transfer, and less with the physical distribution of the bubbles. Absorption of gas by a liquid is a subset of gas-liquid mass transfer. Factors that affect gas-liquid mass transfer are the solubility of the gas in the liquid (saturation), impeller power per unit volume, superficial gas velocity, liquid properties affecting the alpha- and beta-factors, temperature, and the viscosity. Sometimes it is also considered to be an affect of the gas hold-up. Some mixing applications include fermentations, hydrogenations, waste water aeration, oxidations, chlorinations, brominations, fluoridations, sour gas neutralization, gassing with methane, etc. Some of these may also have a solid phase, but the solids are not the limiting case and are therefore neglected here. Where the solids have an effect, see the Phase Properties Category Liquid-Solid Gas.

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