Extra Column Dispersion - Dispersion in Tubular Conduits > Page 21

Dispersion in Tubular Conduits

The dispersion that takes place in open tubular conduits, as already described, results from the parabolic velocity profile that occurs under conditions of Newtonian flow. The distribution of fluid velocity across the tube under condition of Newtonian flow, is depicted diagramatically in Figure 8A. Due to the relatively high velocity at the center of the tube, and the very low velocity at the walls, the center of the band of solute passing down the tube will move ahead of that situated at the walls. This will result in band dispersion and this effect is depicted in Figure 8B.

Figure 8. Dispersion Due to Newtonian Flow in Connecting Tubes