Mixing scales, dispersivity behavior

Mixing Scales. A stochastic simulation will generate C (t,x,y) for a unit inlet concentration in a two-dimensional flow field. The goal oi this generation is to deduce the behavior of the dispersivity and relate these back to the statistical properties of the field however, there are two ways to do this each manifesting a particular scale of mixing. 

Mixing processes involved in the manufacture of disperse systems, whether suspensions or emulsions, are far more problematic than those employed in the blending of low-viscosity miscible liquids due to the multi-phasic character of the systems and deviations from Newtonian flow behavior. It is not uncommon for both laminar and turbulent flow to occur simultaneously in different regions of the system. In some regions, the flow regime may be in transition, i.e., neither laminar nor turbulent but somewhere in between. The implications of these flow regime variations for scale-up are considerable. Nonetheless, it should be noted that the mixing process is only completed when Brownian motion occurs sufficiently to achieve uniformity on a molecular scale. 

Blends of polypyrrole and Teflon were also prepared by the chemical oxidation of pyrrole in an emulsion of Teflon containing the ferric / -toluene sulfonate salt [69]. Pyrrole was added to the ferric salt aqueous solution and mixed with the Teflon emulsion stabilized by Triton X-100. After stirring for 3 hours a finely dispersed blend was obtained. This emulsion was coagulated with ethanol. Conductivity was reported to reach 1 S cm with a percolation behavior. This method could be used for large-scale production of the blend. 

In the following chapter on results and discussion, first solute solubility, is used to describe the two particle generation models developed. Second, the role of the mixing behavior of solvents and supercritical carbon dioxide in the SAS process to produce solid dispersions is defined. The crystallization and the time-scale models are then presented in terms of the solute solubility criterion. A final and more... 

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