Granulation drop formation methods

One of the key steps in this sol-gel granulation process is the formation of the sol droplets. There are basically two ways for droplet formation gravity-force assistant method [63] and shear-force assistant method [64]. In both cases, the orifice of the dropper is immersed in the paraffin oil. In the second case, the shear-force is created by either moving the paraffin oil (orifice is fixed) or moving the orifice in the paraffin oil. When the sol is continuously pushed out through the orifice, the sol in the oil experiences the gravity force or drag-force (in the shear-force assistant method) that acts to separate the drop from the orifice. 

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