Turbine Agitators - used for digesting low-wettability powders in liquids. They are technologically and structurally more advanced than propeller agitators and are characterized by better working parameters.
Turbine impellers operate at low speed and are much larger than propellers. Turbine has an excellent feature in designing the flow pattern where a change in design can divert the flow pattern of fluid by radial flow or axial flow in the reactor vessel. Based on the configuration of the impeller blades these flow patterns can be achieved.
The radial design makes the fluid to flow at high velocity in radial direction whereas axial impellers use pitched blades, make the fluid to flow parallel to shaft in the downward direction and then push the fluid towards the wall of the agitator vessel. For gas dispersion operation radial turbine impeller is used and axial turbine impeller is used for chemical reactions, suspension solid and miscible liquid mixing.
Vessels fitted with either center mounted or off center mounted agitators typically fitted with single or multiple impellers. If center mounted tanks will included multiple sidewall baffles for controlling rotational flow and mixing. These vessels and agitator combinations are typically sized for either mixing applications for up to 1,000 gallons and holding applications up 2,000 gallons. Often the limitation on sizing and use of this style agitation is viscosity of the product up to 15,000 cps and mixer shaft lengths. These are considered low shear mixing type vessel.
Scope of application: the food, pharmaceutical, chemical industries