Common Choice of Stirring Paddles
Elephant Ear Impeller
Application: Suitable for mixing low-viscosity materials and external circulation processes.
Features:
High shear capability.
Moderate mixing performance.
Low energy consumption.
Power Number (Np): ~3.0.
Limitations: Low efficiency for axial flow.
Common Usage: Rotational speed should not exceed 1.5 m/s (to avoid vortex formation).
Marine Propeller
Application: Suitable for low viscosity liquids, especially for liquid circulation and axial flow.
Features:
Smooth flow with small disturbance.
Efficient axial flow characteristics.
Power Number (Np): ~2.5.
Operational Speed: Generally below 1.5 m/s.
Angle: Blade pitch angle is around 45°.
Advantages:
Ideal for large (long) vessels. Commonly used in temperature-sensitive systems or systems requiring uniform temperature.
Six-Blade Rushton Turbine
Application: Designed for multiphase mixing, particularly for gas-liquid or liquid-liquid mixing processes.
Features:
Radial blades with high shear capability.
Excellent dispersing ability.
Moderate mixing performance.
Power Number (Np): ~3.2.
Shear Characteristics: Can increase the gas hold-up ratio by ~40%.
Advantages: Highly versatile for multiphase mixing scenarios.
Six-Blade Flat Blade Rushton Turbine
Application: Suitable for turbulent mixing and medium-to-high viscosity liquids.
Features:
6 flat blades designed for efficient agitation.
Strong radial flow characteristics.
Power Number (Np): 4.5-6.2.
Advantages:
Suitable for a wide range of mixing applications.
Used in gas-liquid mixing, suspension mixing, and blending processes.