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Agitator Design: 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, 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| helical ribbon | 0.97 | 0.9 | 10 | Very high viscosity (>50,000 cP); polymer blending | 0.33 | axial | 0.633 | a | 8-1e5 | 0.18 | 0.35 | 2 | 0.1 | 0.5 |
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