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Agitator Design: retreat curve
Mixing impeller / agitator design data — power number (Np), flow number (Nq), D/T ratio, tip speed, and application guidance for Rushton turbine, pitched blade, hydrofoil, anchor, helical ribbon, marine propeller, Cowles disperser, retreat curve, and rotor-stator high-shear mixer impellers
| impeller type | D T ratio max (dimensionless) | D T ratio min (dimensionless) | Re turbulent threshold (dimensionless) | application | flow number Nq (dimensionless) | flow pattern | power number Np (dimensionless) | tip speed ft s max (ft/s) | tip speed ft s min (ft/s) | tip speed typical ft s (ft/s) |
|---|---|---|---|---|---|---|---|---|---|---|
| retreat curve | 0.75 | 0.6 | 10,000 | Glass-lined pharmaceutical reactors; fine chemical synthesis; corrosive/high-purity service where metal impellers are unsuitable; API manufacturing vessels (Pfaudler, DeDietrich, Thaletec) | 0.23 | mixed axial-radial | 0.37 | 10 | 3 | 5 |
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