The unevenness of temperature profile of highly viscous liquid in an agitated vessel was described with a non-dimensional variable Analyzing the non-dimensional differential equation tor the laminar flow of the agitated liquid with helical ribbon impeller yielded the functional relation O = f(Pe

Ec/Re) Regression of the Newtonian and pseudoplastic fluids temperatures measured in the agitated vessel resulted in the correlations for five types of combined impellers such as helical ribbon-anchor

helical ribbon-helical screw-anchor etc. It is found that in -out helical ribbon anchor ( I ) impeller is the best one.