ABSTRACT
The first section of Chapter 4 gave considerable attention to the development of mixing models for several types of “ideal” cases-ideal in the sense that they represent extremes of mixing behavior that are well-defined and can be treated analytically. The residence-time, internal-and exit-age distributions were shown to provide some means for characterization of mixing within a given system, though the distinction between macro-and micromixing was not resolved completely. From a working point of view, however, we were able to define a PFR as exemplary of the case in which all elements of fluid leaving the system have identical exit ages, and the CSTR as that in which the internal-and exit-age distributions are identical. Further, we were able to show how such distributions could be determined from experimental information on F{t) or C(t).
