Most of the information that is discussed below was obtained on small pilot plants. Only a few
results from industrial demonstration plants have been published.In process engineering, the passage from the model to the production unit can often be facilitated with the aid of similarity theory. In general, this theory can be used to only a limited extent in chemical and biochemical reactors, since when the unit is enlarged the geometric similarity is not necessarily matched by that of fluid motion and mass transfer of the individual transport processes. If, however, a single parameter is rate determining, similarity theory can be very helpful in the calculation of reactors.
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