Agitator Design: rushton_turbine to helical_ribbon
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, and marine propeller impellers
| impeller type | D T ratio max (dimensionless) | D T ratio min (dimensionless) | Re turbulent threshold (dimensionless) | application | flow number Nq (dimensionless) | flow pattern | notes | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| rushton_turbine | 0.5 | 0.25 | 10,000 | Gas dispersion; liquid-liquid mixing; fermentation | 0.8 | radial | 6-blade disk turbine (Rushton DT6); Np=5.75 at turbulent Re>10,000; Nq=0.80; D/T=0.33 typical. High shear — avoid for shear-sensitive cells. | 5.75 | 25 | 5 | 10 |
| pitched_blade_45 | 0.5 | 0.3 | 10,000 | Blending; heat transfer; solids suspension | 0.79 | mixed_axial-radial | 4-blade 45° pitched-blade turbine (PBT4); Np=1.27 turbulent; Nq=0.79; D/T=0.35-0.40 typical. Lower power than RT, better axial flow. | 1.27 | 15 | 3 | 7 |
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