Agitator Design Calculator

Calculate power consumption, mixing time, and scale-up parameters for industrial agitators and mixers

Tank Geometry

Tank Diameter (m)

Liquid Height (m)

Impeller

Type

Impeller Diameter (m)

Typical: D/T = 0.33 (D = 0.66 m)

Rotational Speed (RPM)

Fluid Properties

Density (kg/m³)

Viscosity (Pa·s)

Water: 0.001, Glycerin: 1.4, Oil: 0.05–0.1

Rushton Turbine (6-blade)

Flow: RadialEfficiency: LowN_p: 5N_q: 0.72Use: Gas dispersion, immiscible liquids

Power Consumption

10,547.85kW

Power

14.14HP

Reynolds Number

1.12e+6

Flow Regime

Turbulent

Dimensionless Numbers

Power Number N_p

5.000

Tip Speed

5.2622m/s

Specific Power

1,678.74W/m³

Mixing Performance

Tank Volume

6.2832m³

Pumping Rate

1,948.94m³/h

Circulation Time

11.6060s

Blend Time (95%)

557.0885s

D/T Ratio34%

Typical range: 25–50% (D/T = 0.25–0.50)

Design Recommendations

✓ Tip speed 5.3 m/s — good range (2–6 m/s)

✓ Turbulent regime — good mixing efficiency

✓ D/T = 0.34 — within typical range

Impeller Type Comparison

Impeller Type	N_p	Flow Pattern	Application
Rushton Turbine (6-blade)	5	Radial	Gas dispersion, immiscible liquids
Pitched Blade Turbine (45°)	1.3	Axial	Blending, solids suspension
Hydrofoil Impeller	0.3	Axial	Large volume blending
Anchor Impeller	0.5	Tangential	High viscosity fluids
Marine Propeller (3-blade)	0.35	Axial	Low viscosity blending

About Agitator Design

Understand power number correlations, scale-up methods, impeller types, and mixing fundamentals. The power consumption is calculated from P = N_p ρ N³ D⁵, with N_p corrected for laminar and transition regimes based on Reynolds number. Mixing time is estimated from circulation time using impeller-specific multipliers.