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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