Step 1: Understanding the Concept:
Mixers are picked based on the viscosity and shear needed for a material. A high shear mixer is one built to apply strong, concentrated force over a small gap, used for thick or sticky masses.
Step 2: Key Fact:
The sigma blade mixer has two interlocking blades that rotate at slightly different speeds with a very small clearance from the trough wall. This tight gap forces the material through intense compressive and shearing action, which is the working definition of a high shear device.
Step 3: Detailed Explanation:
A turbine mixer works best on thin, pourable liquids where bulk flow matters more than localized force.
A jet mixer relies on the momentum of a liquid stream, useful for large tanks but not for viscous or sticky material.
A Nauta mixer is built for gentle blending of dry powders and would break down under the forces a high shear process needs.
Only the sigma blade design is made to handle the thick, cohesive materials that require true high shear mixing.
Step 4: Final Answer:
The high shear mixer among the options is the Sigma blade mixer.