Choosing the right impeller and blade option will make your job more efficient. The blade you use depends on the type of mixture with which you’re working.

Ideal material flow is essential to the successful execution of these processes. And with so many mixing impeller designs available for industrial mixing, liquids blending and solids suspension – finding the right option can make a big difference. Each impeller type has unique characteristics and they are not necessarily interchangeable on a given mixer. 

Mixer Horsepower

The horsepower required to drive the impeller can change dramatically with changes in diameter, rotational speed and impeller type.  Before increasing the diameter and/or speed of a mixer impeller, be sure to evaluate horsepower requirements in order to prevent possible motor failure.

Let’s take a look at some of the most popular types.

MixedFlow Impeller

This is the king of flow producing impellers. Unlike the impellers below, this patented design pulls material from above & below, sending the mixture out the middle of the blade. Some applications call for two MixedFlow impellers to be mounted in tandem for a very aggressive action.

Hydrofoil Impellers

The hydrofoil converts most of the motor’s energy to liquid flow and is therefore the highest efficiency impeller with the least shear. Its blade profile creates nearly uniform flow with the minimum required horsepower. Large diameter hydrofoils, driven at low RPM, are often used for jobs that require agitation of large batches.

Marine-Style Propellers

Marine-style propellers perform similarly to the hydrofoil propellers – with slightly higher power consumption and resulting shear. Marine-style propellers and hydrofoils are common selections for low-viscosity mixing.  Steep-pitch propellers are available where increased flow from a given impeller size is desired.  

Axial-Flow Turbines

Axial-flow turbines have wide, flat blade surfaces, at 45-degree angles, to contact and push more viscous materials.  Axial-flow turbines are typically used for flow-controlled processes with higher viscosities. The blade edges of this turbine provide relatively higher shear and require greater horsepower to drive them.  

Radial Flow Turbines

Unlike the previously discussed impellers, radial flow turbines produce a primary flow pattern 90-degrees from the shaft. In order to achieve this motion, flat blades are welded to the hub like the axial-flow turbine, but with a zero-degree angle to the axis of the shaft.  These impellers are often used to assist with gas dispersion or to agitate liquids in vessels of large diameter and minimal depth.

Dispersion Blades

Dispersion Blades convert input energy primarily to shear – causing them to produce a different pattern result than flow-driven agitation processes. When used at recommended tip speeds – driven by sufficient horsepower – these sharp, saw blade-like impellers quickly impart pigments into paints, break down solids into liquids, or create homogeneous emulsions from liquids of dissimilar densities.

Folding Impellers

This impeller allows for entry through small openings, and an assortment of laboratory impellers.  Fawcett can also modify standard impeller designs with a wide range of function, including: polishing and electro-polishing, custom keyways, cut or clipped blades, coatings and more.

For over half a century, we've looked at new ways to improve quality, maximize efficiency, and minimize safety concerns to find solutions for a variety of mixing applications.

Let the mixing equipment specialists at Fawcett help you find the precise solution that works for your mixture requirements.