Agitator Design Calculation Xls ^hot^ -

Always divide the calculated absorbed power by the mechanical efficiency of the gearbox (typically 85-95%) and motor to determine the required nameplate motor power. Static Power Numbers: Npcap N sub p is only constant in fully turbulent regimes (

: Power number (e.g., ~5.0 for a Rushton turbine, ~0.3 for a marine propeller). Motor Sizing

Power consumption is calculated using the dimensionless Power Number ( Npcap N sub p

High axial flow, low shear, highly energy-efficient for blending. agitator design calculation xls

[ Sheet 1: Input Dashboard ] ├── Project Info (Metadata) ├── Process Fluid Data (Density, Viscosity) └── Vessel Geometry (Diameter, Height) │ ▼ [ Sheet 2: Calculation Engine ] ├── Reynolds Number Evaluation ├── Impeller Specs Lookup (VLOOKUP tables for Np) └── Absorbed Power & Torque Calculations │ ▼ [ Sheet 3: Mechanical Design ] ├── Shaft Diameter Calculation └── Critical Speed Analysis │ ▼ [ Sheet 4: Print Summary / Datasheet ] Essential Excel Formulas to Use

Torque is calculated from the absorbed power and the rotational speed. This value sizes the gearbox and shaft diameter.

What you are using (e.g., hydrofoil, pitch-blade, Rushton)? Always divide the calculated absorbed power by the

However, the very accessibility of the .xls format breeds significant risk. The most dangerous line in any agitator spreadsheet is the "power number" (Np) input. Np is not a universal constant; it depends on baffle configuration, tank geometry (D/T ratio), impeller clearance, and even viscosity. A spreadsheet that defaults to a standard Np of 5.0 for a Rushton turbine without adjusting for an unbaffled tank will overestimate power by 300-400%.

Building a robust saves hours of manual work and standardizes the engineering workflow. By linking fluid mechanics formulas directly to mechanical shaft calculations, you ensure that your mixing system is both chemically efficient and structurally sound.

Tailor calculations to specific processes (e.g., solid suspension vs. liquid-liquid dispersion). [ Sheet 1: Input Dashboard ] ├── Project

The spreadsheet should automatically compute the following values based on your inputs: : is the rotational speed in revolutions per second (RPS). Power Requirement ( ) :

Before building or utilizing an agitator design calculation spreadsheet, you must understand the core physical principles governing fluid mixing. Flow Regimes and Reynolds Number