constant for the selected impeller. Calculate the absorbed power (
Choose an axial flow hydrofoil for liquid blending, or a radial flat-blade disc turbine (Rushton) for gas dispersion. Determine diameter (
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Fluid moves outward toward the vessel walls (ideal for gas dispersion and high-shear applications). 2. Step-by-Step Calculation Methodology agitator design calculation pdf download verified
NRe=ρ⋅N⋅D2μcap N sub cap R e end-sub equals the fraction with numerator rho center dot cap N center dot cap D squared and denominator mu end-fraction : Fluid density ( : Impeller rotational speed ( : Impeller diameter ( : Dynamic viscosity ( Flow Regime Classification Laminar Flow (
Lookup tables for standard impeller geometries (Rushton, Hydrofoil, Pitch Blade). Mechanical shaft sizing verification matrices. Critical speed and deflection calculators.
Size the electrical motor using gearbox and motor efficiency factors. constant for the selected impeller
(Viscosity, Density, Newtonian or Non-Newtonian).
Torque is derived from the absorbed power and rotational speed:
= Static deflection of the shaft under the weight of the impeller and shaft mass. Verified PDF Download: Agitator Design Calculation Template This suggests they want a comprehensive, informative article
Problem statement and Scope
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The speed at which the shaft will vibrate uncontrollably. Operating speed should typically be or less of the first critical speed.
The Reynolds number determines the fluid flow characteristics inside the mixing vessel.
Calculating the required shaft power determines the motor sizing, gearbox selection, and structural support engineering. The Power Number ( Npcap N sub p The dimensionless Power Number ( Npcap N sub p