Abstract:
Mixing impellers are used to dissolve solutes in solvents, disperse solids in liquids and
emulsify immiscible liquids. A system that needs mixing can be classified as a low viscosity
system, a medium viscosity system or a high viscosity system, depending on the viscosity of
the final product. Dissolution of salt (NaCl) in water to obtain a saturated solution, can be
called a low viscosity system, while, the dispersion of fine particles of solids such as
pigments, extenders and fillers in a liquid to produce a paint can be called a high viscosity
system. Likewise, the dispersion of a solid in a liquid to obtain slurry may be called a
medium viscosity system.
