In view of the limitation to a gas-liquid surface aerator with single-impeller configurations that the aerated gas bubbles are concentrated in the upper region of the reactor, five dual-impeller configurations are tested with respect to specific power consumption, gas?liquid volumetric mass transfer and mixing time.

At the background of the intricate polymerization process of syndiotactic polystyrene,horizontal two shaft T shape self cleaning agitator is used and it is studied that power consumption and fluid pattern are affected by rotating speed and Hold up.

This paper presents the characteristics of mixing on the critical speed of complete suspension of solid,gas and solid dispersion state, power consumption, gas-liquid mass transfer characteristic for different suspension concentration and gas volume in three phases system using 45° pitched blade disk turbine (pumping down ) in mechanically stirred vessels.

In the meanwhile it introduces the method for calculating the necessary stirring power as well as the practical example.

The way to reinforce the stirring effect and lower the stirring power is also given.

The melt of aluminum alloy in the electromagnetic field was stired by different stirring power and the microstructure of the material that was got from different stirring technology was observed.

The agitation power and gas hold-up were measured in φ 476 mm and φ784 mm two vessels equipped with coils, and Rushton turbine (DT),4 blade(45°) inclined turbine(4IBT),6 blade(45°) inclined turbine(6 IBT) used to compose two stratum impeller systems.