Granule size distribution

The effect of miid-penetratiou rate and the extent of penetration on granule-size distribution for drum granulation was shown by Gluba et... 

Powder Hand. Pmc., 2, 323 (1990).] Increasing penetration rate increased granule size and decreased asymmetry of the granule-size distribution. 

Continuous fluid-bed granulators are used in the fertilizer and detergent industries. For fertilizer apphcations, near-size grannies are recycled to control the granule size distribution. Dust is not recycled directly, but first remelted or slurried in the liquid feed. 

Clearly the granule size distribution is self-preserving in 1 Vt/V(t). Further, combining Eqs. (50), (64), and (68) results expression for the mean volume the reduced size in the following... 

Simulated results of Pulvermacher and Ruckenstein (P10) have demonstrated that the similarity spectra are established in very short agglomeration times irrespective of the initial granule size distribution, and that the size dispersion decreases with an increase in the value of the exponent y. 

The effect of fluid penetration rate and the extent of penetration on granule size distribution from drum granulation experiments is illustrated in Fig. 20 (since no example for fluidized bed granulation is available). From Fig. 20, it is clear that for fluids with a similar extent of penetration, increasing the penetration rate increases the average granule size for various levels of liquid loading. 

The population follows the change in the granule size distribution as granules are bom, die, grow, or enter or leave a control volume, as illustrated in Fig. 34. The number of particles between volume v and v - dv is n(v)dv, where n(v) is the number frequency size distribution, or the number density. The population balance for granulation is then given by... 

Figure 36. Contrast in granules size distribution due to layering vs. coalescence.

Table 7. The Effect of Various Size Change Mechanisms on the Granule Size Distribution...

In this respect, the automated controlled mode leads to a higher homogeneity of the granule size distribution (Table 2) than in the case of adding... 

---