Granulation capillary state

Newitt and Conway-Iones4 found that there are four types of liquid state of granules depending on the liquid content in the granules. These states are known as pendular, funicular, capillary and droplet. 

Nucleation This is where individual powder particles adhere to each other due to the liquid films. These particles will go through the different states discussed above from the pendular to the capillary state. These agglomerated particles in the capillary state will serve as nuclei for further granule growth. 

Depending on the amount of liquid in the bridges that form a granule, four states of liquid bonding have been identified pendular, funicular, capillary, and droplet (Lloyd, 1983) (Figure 14). In the pendular state, depending on the powder composition, the strongest forces can be involved ... 

By adding more liquid, a transition to the capillary state occurs, which is highly dependent on the primary particle morphology. The accessible binder fraction (Fig. 7.25b) follows a sigmoidal dependence on granule composition, which can... 

Figure 17 The influence of the Stokes number on the final shape of a granule surrounded by dry powder. Binder covered agglomerates in a shearing medium at steady state, t = 100. Total number of particles in the domain, N = 10,000 capillary number Ca = 10.0.

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