Types of Agitator Impellers
1. Propeller Impeller
- Design: 3-blade or 4-blade, pitched.
- Flow: Axial (top to bottom circulation).
- Use: Low-viscosity liquids, blending, heat transfer.
- Industries: Beverages, chemical, fermentation.
2. Turbine Impeller
- Design: Flat or pitched blades mounted on a central disc.
- Flow Radial (side-to-side) or mixed flow.
- Types:
- Flat-blade turbine → high shear, radial mixing.
- Pitched-blade turbine → axial + radial mixing.
- Use: Gas dispersion, emulsification, solid suspensions.
- Industries: Bioreactors, pharma, fermentation, chemicals.
3. Paddle Impeller
- Design: Two flat blades, straight or pitched.
- Flow: Radial, gentle circulation.
- Use: Slurry mixing, medium-viscosity fluids.
- Industries: Paints, wastewater, adhesives.
4. Anchor Impeller
- Design: Large, anchor-shaped blade hugging tank wall.
- Flow: Sweeps close to walls, prevents buildup.
- Use: High-viscosity liquids, creams, gels, polymers.
- Industries: Food, cosmetics, pharma, resins.
5. Helical / Ribbon Impeller
- Design: Spiral/helical ribbon around shaft.
- Flow: Axial + radial flow.
- Use: Very high viscosity (dough, slurries, pastes).
- Industries: Food, polymer, chemicals.
6. Saw-tooth Disc Impeller (High-Shear)
- Design: Circular disc with saw-tooth edge.
- Flow: Strong shear forces, dispersive mixing.
- Use: Breaking agglomerates, emulsification, dispersions.
- Industries: Paints, inks, coatings, emulsions.
7. Marine Impeller
- Design: Similar to ship propeller.
- Flow: Axial circulation, efficient pumping.
- Use: Suspension of solids, blending, fermentation.
- Industries: Water treatment, fermentation, beverages.
8. Hydrofoil Impeller
- Design: 3 thin, curved blades (airfoil design).
- Flow: Strong axial flow, energy efficient.
- Use: Large-scale mixing, gas dispersion.
- Industries: Chemical reactors, bioprocess, wastewater.
✅ Summary by Application
- Low viscosity: Propeller, Marine, Hydrofoil.
- Medium viscosity: Turbine, Paddle.
- High viscosity: Anchor, Helical/Ribbon.
- High shear / dispersion: Saw-tooth Disc.
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