Achieving the required mass transfer, heat transfer, solid suspension, or liquid-liquid emulsification.
): Derived from the power and operational speed. Torque dictates the minimum diameter of the upper shaft. Bending Moment ( Mbcap M sub b
P=Np⋅ρ⋅N3⋅D5cap P equals cap N sub p center dot rho center dot cap N cubed center dot cap D to the fifth power For transitional or laminar regimes, Npcap N sub p
To build or verify a "repack" calculation spreadsheet, organize your worksheets using the following logical structure: agitator design calculation xls repack
) drawn by an impeller depends heavily on the Power Number ( Npcap N sub p
) does not exceed 70-80% of the shaft's first natural critical frequency ( Nccap N sub c
ds=(16⋅Meπ⋅τall)1/3d sub s equals open paren the fraction with numerator 16 center dot cap M sub e and denominator pi center dot tau sub a l l end-sub end-fraction close paren raised to the 1 / 3 power 5. Critical Speed Analysis Achieving the required mass transfer, heat transfer, solid
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Industrial mixing is a critical unit operation in the chemical, pharmaceutical, food, and water treatment industries. Designing an efficient agitator requires a deep understanding of fluid mechanics, mass transfer, and mechanical engineering. A flawed design can lead to incomplete reactions, product degradation, or catastrophic mechanical failure.
), viscous forces dominate, and the power equation shifts to: Bending Moment ( Mbcap M sub b P=Np⋅ρ⋅N3⋅D5cap
Demands high shear fields to break gas bubbles into smaller diameters for mass transfer. Key Geometric Ratios
| | Value | | --- | --- | | Tank diameter (m) | 2.5 | | Tank height (m) | 3.5 | | Fluid density (kg/m³) | 1000 | | Fluid viscosity (Pa·s) | 0.01 | | Impeller type | Rushton | | Impeller diameter (m) | 1.2 | | Impeller pitch (m) | 1.5 | | Power number (Np) | 3.5 | | Torque number (Nt) | 2.5 | | Agitator speed (rpm) | 100 |
Generates accurate motor kilowatt requirements, shaft diameters, and flow rates within seconds.