Radial Raschig

Anderson et al.1 1.27-cm Raschig rings 30.48 91.44 Air - water, radial and axial dispersion... 

In all the studies described above, only the axial dispersion was considered. Anderson et al.1 measured the radial dispersion for the dispersed water phase in an air-water system. The measurements were carried out in a 30.48-cm-diameter Lucite tube packed with 91.44 cm of 1.27-cm Raschig rings. A continuous source of tracer was used. The radial Peclet number decreased with the increase in both the gas and liquid Reynolds number. Some typical results are shown in Fig. 8-5. The measurements were carried out up to the flooding point. The entire results were correlated graphically, as shown in Fig. 8-6. In Figs. 8-5 and 8-6 the Peclet number was based on the fluid velocity through the column, the nominal packing... 

Figure 3. Measured radial fraction profile of a bed packed with Raschig rings.

Berner and Zuiderweg [112] obtained the following equaticm for determination of the coefficient of radial liquid spreading for Raschig rings and Intalox saddles... 

To ensure uniform distribution over the column cross-section between the liquid distributor and the main honeycomb packing, a special redistribution layer of inclined Raschig rings is mounted. For this layer the packing No 4, Table 7, Chapter 8, with an average coefficient of radial spreading ZN2.64.10 m is chosen. As shown in Chapter 8, part 8.3.4., at the time of the column construction, this packing ensured minimal pressure drop. 

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