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Hydrofoil impellers are designed to maximize fluid flow and minimize shear rate. Since most industrial applications require high pumping capacity and less fluid shear, these impellers are popular in the majority of mixer installations.
Low solidity ratio impellers are efficient for liquid blending and solid suspensions.
Higher-solidity-ratio impellers are more effective for axial flow patterns as the viscosity increases.
For gas–liquid dispersions, higher-solidity-ratio impellers with wide blades provide an effective area of preventing bypass of gas through the impeller hub.