Rotor Stator Impeller mixer

Rotor Stator Impeller: What Is It and How Does It Work?

A rotor stator impeller is a type of mixer that uses high-shear forces to blend, disperse, emulsify, or homogenize fluids or solids. It consists of a rotating impeller (rotor) and a stationary housing (stator) that have a small gap between them. The rotor stator impeller creates intense turbulence and shear in the gap, breaking down the particles or droplets in the fluid and producing a uniform mixture.

Rotor stator impellers are widely used in various industries, such as food, pharmaceutical, cosmetic, chemical, and biotechnology. They can handle a wide range of viscosities and flow rates, and can process both batch and continuous modes. They can also be mounted in different ways, such as in-line, top entry, side entry, or bottom entry.

Rotor Stator Impeller mixer tank

How Does a Rotor Stator Impeller Work?

A rotor stator impeller works by creating three types of mixing actions:

  • Mechanical shear: The rotor imparts high-speed rotational motion to the fluid, creating shear stress that breaks down the particles or droplets.
  • Hydraulic shear: The fluid is forced through the narrow gap between the rotor and the stator, creating high-pressure gradients that further reduce the particle or droplet size.
  • Cavitation: The rapid changes in pressure and velocity in the gap cause the formation and collapse of microscopic bubbles, generating shock waves that enhance the mixing effect.

The combination of these mixing actions results in a high degree of homogeneity and dispersion in the fluid. The rotor stator impeller can also generate axial flow in the tank or pipe, improving the overall circulation and heat transfer.

What Are the Advantages of a Rotor Stator Impeller?

A rotor stator impeller has several advantages over other types of mixers, such as:

  • It can produce finer particle or droplet sizes than conventional mixers, improving the stability and quality of the product.
  • It can handle high-viscosity fluids and solids without clogging or overheating.
  • It can operate at high speeds and power levels, increasing the productivity and efficiency of the process.
  • It can be easily customized to suit different applications and requirements, by changing the design and configuration of the rotor and stator.

What Are the Applications of a Rotor Stator Impeller?

A rotor stator impeller can be used for various applications that require high-shear mixing, such as:

  • Emulsification: The formation of stable mixtures of immiscible liquids, such as oil and water. Examples include mayonnaise, salad dressing, creams, lotions, paints, and coatings.
  • Dispersion: The distribution of solid particles in a liquid medium. Examples include pigments, dyes, fillers, catalysts, enzymes, and nanoparticles.
  • Homogenization: The reduction of variation in composition or properties within a fluid. Examples include milk, juice, yogurt, gelatin, sauces, and syrups.
  • Cell disruption: The rupture of cell membranes to release intracellular contents. Examples include bacteria, yeast, algae, fungi, and animal cells.

If you want to learn more about how to use a rotor stator impeller for your mixing needs, or if you need high-quality stainless steel process equipment for your processing needs, visit Plygen Industries, a leading supplier mixing equipment for various industries.