Types of Agitators – Design and Usage
Types of Agitators
Type of agitators used in reactors
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Sigma Blade Mixer Blades
Sigma blade mixers go by several names including Z-blade mixes and double arm mixers. The most common blade design is the sigma blade (shown below), hence the name. Other mixer blade designs are available including:
- Dispersion blades
- Masticator blades
- 180° Spiral blades
- Naben blades
- Double Naben blades(a.k.a. fish tail)
Sigma blades overlapping design is typically used for lighter mixing applications.
Sigma Blade Mixer Blades
Sigma blade mixers go by several names including Z-blade mixes and double arm mixers. The most common blade design is the sigma blade (shown below), hence the name. Other mixer blade designs are available including:
- Dispersion blades
- Masticator blades
- 180° Spiral blades
- Naben blades
- Double Naben blades(a.k.a. fish tail)
Sigma blades overlapping design is typically used for lighter mixing applications.
Types of Agitators
- Paddle Agitators
- Anchor type agitators
- Propeller type agitators
- Blade type agitators
- Turbine type agitators
- Helical Agitators
1. Paddle Agitators: Containing paddle-shaped blades, these agitators are the most basic types of agitators. Their capability is limited and used mainly for laminar flow fluids requiring little shearing. They are adjustable and contain an equal number of forwarding and reversing paddles to move ingredients from one end of the vessel to the other.
A modified version of paddle agitators is Sawtooth Paddle Agitators. The forward puddles of such agitators contain notches or saw teeth.
2. Anchor Agitators: For mixing highly viscous and non-Newtonian fluids, anchor agitators are widely used. Their name indicates the impeller shape that resembles an anchor. They are normally mounted in tanks and vessels with conical or rounded bottoms.
3. Propeller Agitators: For low-viscosity products, Propeller agitators are highly suitable. Functions like homogenization, suspension, and dispersion are easily achieved using propeller-type agitators operating at medium to high speeds. These axial flow agitators are ideal for solid-in-liquid suspensions as they prevent the deposition of solid particles.
4. Blade Type Agitators: These are suitable for low and medium-viscosity fluids. Blade-type agitators are axial type.
5. Turbine Agitators: For emulsification and dispersion of fluids at very high speed, Turbine agitators are used widely. Turbine Agitators are characterized by highly effective mixing capability across a broad viscosity range. Turbine agitators have an axial input and radial output. They combine rotation and centrifugal motion during work.
6. Helical Agitators: As the blades are arranged in a structure of a helix, they are known as helical agitators. Appearing like a threaded screw, helical agitators are axial flow agitators that provide vigorous motion within the vessel or tank. This type of agitator is widely used in polymer industries.
The following table provides the main applications, advantages, and disadvantages of various types of agitators.