Which among the following is an example of a high shear mixer:
- Turbine mixer
- Jet mixer
- Sigma blade mixer
- Nauta mixer
The Correct Option is C
Approach Solution - 1
A high shear mixer is designed to generate intense mixing forces, which break down particles, droplets, or clumps in a mixture, enhancing the homogeneity of the system. The Sigma blade mixer is an example of a high shear mixer. It features two counter-rotating blades that move through the material at high speeds, creating a significant shear force that efficiently mixes the material.
- Turbine mixer: While it can create significant mixing action, it is generally used for mixing fluids or low-viscosity materials, but not specifically a high shear mixer.
- Jet mixer: This type of mixer uses high-velocity jets of liquid to mix, but it is not considered a high shear mixer in the traditional sense.
- Nauta mixer: This is a type of conical screw mixer used for mixing powders, but it does not generate the high shear forces typical of high shear mixers like the Sigma blade mixer.
Thus, the correct answer is C, as the Sigma blade mixer is a well-known high shear mixer used for intensive mixing operations.
Approach Solution -2
The question asks which of the listed mixers is a high shear mixer, one that applies intense localized force to break up clumps, disperse solids, or emulsify liquids. Checking what kind of motion each machine produces settles it.
- Turbine mixer: A turbine mixer uses a rotating impeller to create bulk flow and turbulence in a liquid. It is effective for blending low to medium viscosity fluids but the shear it generates at the blade tips is moderate, not the intense localized shear that defines a high shear mixer.
- Jet mixer: This design pushes liquid through a nozzle at high velocity to induce mixing by momentum transfer. The mixing comes from jet impingement and entrainment rather than a mechanical shearing action, so it is not classed as a high shear device.
- Sigma blade mixer: This machine uses two blades shaped like the letter sigma that rotate toward each other at different speeds inside a trough. The close clearance between the blades and the trough wall, combined with the kneading and folding action, generates strong shear and compressive forces. This is the standard equipment used for high shear mixing of viscous pastes, doughs, and semisolids.
- Nauta mixer: This is a conical vessel with a slow moving orbiting screw that lifts and folds dry powders. The action is gentle blending suited to free flowing solids, and it deliberately avoids high shear because that would damage friable powder particles.
Only the sigma blade design combines close blade clearance with a kneading motion strong enough to count as high shear.
Therefore, the correct answer is Sigma blade mixer.
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