Initial scale of segregation

If one would introduce the feed streams through a number of nozzles distributed across the reactor, one would reduce the initial scale of segregation. If one would dilute the reactants with the solvent, the initial intensity of segregation would be reduced. Both measures would contribute to a better mixedness of the liquid in the reactor, at a given mixing rate. 

We may estimate a micro-mixing time by putting Fo equal to 0.1. Of course, this is a rough approximation, because since the striation thickness decreases as the diffusion proceeds, a much more complicated mathematical calculation is required. The initial striation thickness is an important parameter. It is in fact the initial scale of segregation. It is assumed here that it is equal to the inlet tube diameter d. The diffusion time is is then found from... 

Micro-mixing times are determined by the initial scale of segregation, that is often equal to the inlet tube diameter (or in particular cases to the clearance between impeller blades and the wall). 

On scale-up, the ratio of the specific energy dissipation and the square of the scale of initial segregation (e.g., inlet tube diameter) should be kept constant. Since this may require the same stirrer speed on the larger scale, Ae required torques on the propeller shaft may become prohibitive. This will limit the maximum applicable size of stirred reactors for very viscous liquids. 

CSC atomization was developed by AEA Harwell Laboratories in the UK in the early 1970 s. Initially, the CSC process was used for the atomization of refractory and oxide materials such as alumina, plutonium oxides, and uranium monocarbide in nuclear fuel applications. Since it is well-suited to the atomization of reactive metals/alloys or those subject to segregation, the CSC process has been applied to a variety of materials such as iron, cobalt, nickel, and titanium alloys and many refractory metals. The process also has potential to scale up to a continuous process. 

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