STUDIES ON TRANSFER PROCESSES IN MIXING VESSELS - SUSPENDING OF SOLIDPARTICLES IN LIQUID BY MODIFIED RUSHTON TURBINE AGITATORS

The modified blade turbines are attractive alternatives to the standar d Rushton turbine as they do not require any modification in the elect rical engine motor and drive assemblies are simple to manufacture and have a reduced power consumption. The modified blades were obtained th rough increase in the blade height of the Rushton turbine simultaneous ly with perforation of the blade surface. The field surface of the mod ified blade is equal to the blade surface of the standard Rushton turb ine. In this study the modified blade turbine with the surface fractio n of the perforations equal to 0.353 is used. The complete suspension speed and the power dissipation in transition and turbulent regimes us ing standard and modified Rushton turbine agitators positioned singly or doubly on same shaft, in five solid-liquid systems were investigate d. The solid particles used have the mean diameter between 15-1000 mu m. The modified blade turbine, noted as TP3, was found to be more effi cient than the standard turbine in complete and homogeneous suspension .