Why use a high shear mixer rather than a simple agitator?

Agitators can give satisfactory results for simple duties such as blending like-viscosity liquids, providing in-tank uniformity and promoting heat transfer in jacketed vessels. But because conventional mixing equipment, such as simple agitators, does not produce any shear energy it is incapable of performing more complex mixing duties. For example, an agitator cannot form a uniform, stable emulsion as no shear energy is imparted into the mixture. Although the phases may appear to have been mixed, once agitation is stopped the phases will separate. Without shear energy, the globule size of each phase cannot be sufficiently reduced to maintain stability. The agitator simply moves them around the vessel.

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