0.2.4.
Dispersion in FIA System
As we have seen, on previous slide, a zone of dye (A) injected into a carrier stream initially acquires the shape of a sharp hollow cone (B), since the center of the stream moves at double the mean flow rate velocity, while friction at the tube walls causes the formation of a trailing edge. As the zone moves downstream, the radial dispersion, if sufficiently fast, will reshape the parabolic bolus into a “rolling ball” shape. In this way, the initial square input (A), turns from asymmetric (B) and ultimately into a Gaussian (C) shape. We will discus this process later, along with RTD response curves and symbols shown here.
