Perera, SASHatharasinghe, RC2014-01-102014-01-1020022002http://dl.lib.mrt.ac.lk/handle/123/9751Mixing 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.enConference-Extended-Abstract2002ERU Research for industryF1-F2Proceeding of the 8th annual symposium