Propellers

Principles of Propellers:

• Propeller mixers operate on the principle of creating axial and radial flow patterns in liquids.
• The propeller blades create a vortex that circulates the liquid, promoting thorough mixing.

Construction of Propellers:

1. Propeller Blades: Three or more angled blades mounted on a central shaft.
2. Drive System: Includes a motor and gearbox to rotate the propeller.
3. Mounting: Can be mounted on the top, side, or bottom of the mixing vessel.
4. Mixing Vessel: A container that holds the liquid to be mixed.

Working:

• The propeller is submerged in the liquid to be mixed.
• When the propeller rotates, it creates a vortex, drawing the liquid from the top and pushing it downward.
• This circulation pattern ensures thorough mixing of the liquid throughout the vessel.
• Mixing continues until the desired homogeneity is achieved.

Uses:

• Chemical Industry: Mixing solutions, suspensions, and emulsions.
• Water Treatment: Ensuring uniform distribution of chemicals in water.
• Food Industry: Blending beverages, syrups, and other liquid ingredients.

Merits:

• Efficient for low to medium viscosity liquids.
• Simple design and easy to operate.
• Can be used for continuous mixing.
• Low energy consumption compared to other mixers.

Demerits:

• Not suitable for high-viscosity materials.
• Limited shear force, which may be insufficient for certain applications.
• Propeller blades can cause foaming in some liquids.

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