Studies on transfer processes in mixing vessels: hydrodynamic of the modified Rushton turbine agitators in gas—liquid dispersions

Abstract

The modified blade turbines are attractive alternatives to the standard Rushton turbine as they do not require any modification in the electrical engine motor and drive assemblies, are simple to manufacture, have a reduced power consumption and have a greatly increased gas-handling capacity before flooding. The modified blades were obtained through increase in the blade height of the Rushton turbine simultaneously with perforation of the blade surface. The filled surface of the modified blade is equal to the blade surface of the standard Rushton turbine. Power dissipation and hydrodynamic regimes using standard and modified Rushton turbine agitators positioned singly or doubly on the same shaft, in a gas—liquid system, were investigated. The TP3 modified turbine with the surface fraction S G/ S C of the perforation equal to 0.353 is optimum on the basis of the power consumption and of the gas-handling and dispersing capacity.