Agitator Design: marine_propeller to paddle
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 | ht constant a (dimensionless) | ht exponent b type | ht re range | ht viscosity correction m (dimensionless) | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| marine_propeller | 0.4 | 0.2 | 10,000 | Low-viscosity blending; circulation; heat transfer | 0.5 | axial | 0.54 | w | 2e3 (one point) | 0.14 | 0.32 | 20 | 5 | 10 |
| cowles_disperser | 0.45 | 0.3 | 10,000 | Pigment/filler dispersion; paint/coating manufacturing; ink grinding; cosmetics dispersion; wetting powders into liquid | 0.32 | radial_high-shear | — | — | — | — | 0.45 | 25 | 15 | 20 |
| 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 |
| rotor_stator | 0.2 | 0.05 | 10,000 | Emulsification; homogenization; solubilization; particle-size reduction; cell disruption; high-shear dispersion of immiscible liquids; batch tank Silverson and IKA Ultra-Turrax type workheads | 0.1 | local_radial_high-shear | — | — | — | — | 2 | 66 | 33 | 49 |
| paddle | — | — | — | — | — | — | 0.36 | w | 300-3e5 | 0.21 | — | — | — | — |
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