About High Shear Mixers
High shear mixers are devices that are designed to thoroughly combine solid, gas or liquid components that cannot be mixed together using normal blending or mixing methods. High shear mixers use a phenomenon of fluid dynamics known as sheer strain to combine difficult to mix materials.
Sheer strain is created when two or more fluid bodies move across one another at different speeds. The difference in speed creates an area of deformation in the area of contact between the liquids.
A rotor or impellor, along with a component that remains stationary, known as a stator, is used in a tank that contains the solution to be mixed, or in pipe where the solution passes through it, to create sheer.
High shear mixers are used to create suspensions, emulsions and granular products. These high shear mixers produce standard mixtures of ingredients that do not naturally mix together.
When the final liquid is composed of two or more separate liquids the end result is referred to as an emulsion. When the mixture contains a solid and a liquid it is called a suspension, and if a gas is dispersed through a liquid it is called a lyosol.
High shear mixers achieve a standard mix by employing a technique called equilibrium mixing. Equilibrium mixing identifies a target characteristic. Once the mixed product acquires the target characteristic it will not change significantly after that regardless of the amount of mixing and processing.
In dispersions the target characteristic is the particle size. The amount of mixing that is required to achieve equilibrium is measured in tank turnovers. Tank turnover is the number of times the volume of material must pass through the high shear zone.