Innovation by MIXACO: The Geometry Behind Mixing Performance

Why the right mixing tool is key to matrial flow, energy input and reproducible performance.

A mixing tool is much more than a rotating component inside the mixer. Its geometry determines how the material moves, where mechanical energy is introduced and how effectively every part of the batch is incorporated into the mixing process.

At MIXACO, tool geometries are developed around the specific mixing task. Depending on the application, the objective can be gentle homogenization, intensive dispersion, deagglomeration, controlled shear or efficient heat transfer.

Tool Geometry Makes the Difference – Engineering the Mixing Process

The mixing tool is the primary interface through which mechanical energy is transferred from the drive system into the product.

Its geometry – diameter, blade angle, blade width, number of tool levels, radial position and clearance to the vessel wall and bottom – directly influences:

• Tip speed [m/s]
• Specific energy input [kWh/kg]
• Power density [kW/m³]
• Shear rate and shear intensity
• Axial and radial product circulation
• Particle acceleration and collision frequency
• Deagglomeration efficiency
• Heat generation and heat-transfer rate
• Mixing time and batch homogeneity

This is why MIXACO develops mixer geometry, tool configuration and process parameters as one integrated system, rather than considering the mixing tool as an independent component.

Key Parameters and how they Influence the Mixing Process

Peripheral / Tip Speed

v=πDn/60

where D is tool diameter [m] and n is rotational speed [rpm].

This immediately demonstrates why RPM alone is not a meaningful parameter when comparing different mixer sizes. A 200 mm tool and an 800 mm tool operating at the same RPM generate completely different peripheral velocities and therefore completely different mechanical interaction with the product.

Specific Energy Input

Especific=mP⋅t

This links motor power, processing time and batch mass and provides a much more useful indication of the actual energy introduced into the material.

Power Density

PV=VP

Power density becomes particularly relevant when scaling a process from laboratory to production equipment.

MIXACO does not simply scale RPM geometrically. Tool diameter, tip speed, installed power, filling level, bulk density and product behavior must be evaluated together to reproduce the required mixing mechanism.

Material Properties →

Material / Process Parameter

Particle size [µm]

Bulk density [kg/L]

Batch mass [kg]

Filling level [%]

Tool diameter [mm]

Rotation speed [rpm]

Tip speed [m/s]

Motor power [kW]

Specific energy [kWh/kg]

Product temperature [°C]

Mixing time [s/min]

Tool Geometry

Influence on Tool Design

Dispersion and deagglomeration requirement

Torque, power demand and circulation behavior

Required energy input

Product circulation and active mixing volume

Tip speed and swept area

Product acceleration

Shear and dispersion intensity

Available mechanical energy

Process intensity

Thermal process control

Productivity and total energy input

Designed for the Process

Different materials require different flow patterns and levels of mechanical input. Particle size, bulk density, sensitivity and the desired mixing result all influence which tool configuration delivers the best performance.

That is why MIXACO does not consider the mixing tool independently from the process. Mixer, tool geometry and process parameters are developed as one system.

The result: controlled material movement, efficient energy transfer and reproducible mixing quality tailored to the individual application.