Granulation regimes

All the kernels are empirical, or semiempirical and must be fitted to plant or laboratory data. The kernel proposed by Adetayo and Ennis is consistent with the granulation regime analysis described above (see section on growth) and is therefore recommended ... 

Adetayo Ennis [AIChE J, (1997) In press], based on granulation regime analysis. 

In a real process, both binder surface tension as well as viscosity will act to dissipate energy and ensure sticking and coalescence, but no simple analytical solution exists for this case. It was also demonstrated by Ennis (Ennis et al., 1991) that conditions based on viscous dissipation are more restrictive then those based on capillary forces and hence the discussion of granulation regimes is limited, in this paper, to the former. 

Figure 24. Schematic representation of transitions between granulation regimes.

Ennis, B. J., Tardos, G. I., and Pfeffer, R. A Microlevel-Based Classification of Granulation Regimes and Mechanisms, Proceedings of the Second World Congress on Powder Technology, p. 409, Kyoto, Japan (1990a)... 

Equation (13.19), which is consistent with the granulation regime analysis described above ... 

To make effective use of the granulation regime map we need reasonable estimates of the effective collision velocity Uc (controlled by process conditions) and dynamic yield stress Y (a function of formulation properties). Table 2 gives estimates of the average and maximum collision velocities for different process equipment. In... 

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