Impeller is a rotating component in agitation assemblies that transfers energy to fluids for mixing, blending, or pumping applications.
An impeller is a rotor with curved blades designed to accelerate fluid radially outward from the center of rotation. In agitation assemblies, it converts rotational mechanical energy into kinetic energy and pressure in the fluid, creating flow patterns essential for homogenization, suspension, heat transfer, and chemical reactions. Impellers are characterized by their blade geometry, diameter, rotational speed, and flow direction (axial, radial, or mixed).
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Axial flow impellers (e.g., pitched blade turbines) move fluid parallel to the shaft, ideal for blending and suspension. Radial flow impellers (e.g., Rushton turbines) discharge fluid perpendicular to the shaft, generating high shear for dispersion and gas-liquid mixing.
Consider fluid viscosity, mixing objective (e.g., homogenization, solids suspension), tank geometry, and power availability. Low-viscosity fluids often use axial impellers, while high-viscosity or shear-sensitive applications may require specialized designs like helical ribbons or anchors.
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