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Hydrofoils (or Hi-Flow, High Efficiency impellers) are developed to provide excellent pumping ability with a strong axial flow.
Basically, the Hydrofoils have two, three or four tapering twisted blades, which are cambered and sometimes manufactured with rounded leading edges. They are available as a welded or bolted assembly.
Hydrofoils are ideal for low shear mixing, solids suspension, heat transfer, dissolution and flocculation in low viscosity fluids.
MORE ABOUT IMPELLER TYPES:
Basically, there are two types of impellers, depending on the flow regime created:
1) Axial flow impeller
Typical types: Marine propeller; Hydrofoil; Pitch blade
Axial flow impellers impose essentially bulk motion, and are used on homogenization processes, in which increased fluid volumetric flow rate is important.
2) Radial flow impeller
Typical types: Anchor & Gate; Dissolver; Rushton turbine; Helical ribbon; Retreat
Radial flow impellers impose essentially shear stress to the fluid, and are used, for example, to mix immiscible liquids or in general when there is a deformable interface to break. Another application of radial flow impellers is the mixing of very viscous fluids.