The design and calculation of an industrial agitator (or mixer) involves determining the mechanical and process parameters required to achieve a specific mixing duty. For a spreadsheet-based approach (XLS), the fundamental goal is to calculate the motor power (HP/kW), shaft diameter, and critical speed based on fluid properties and vessel geometry. 1. Core Agitator Design Formulas
Beyond the fluid, the agitator must survive the physical stress. Calculations must account for: Shaft Runout: agitator design calculation xls
The first step is to input the basic geometry and physical constants of your system: Vessel Geometry: Tank diameter ( ), liquid height ( ), and the presence of baffles. Fluid Data: and viscosity ( Impeller Choice: The design and calculation of an industrial agitator
Agitator Specs: Impeller type (e.g., pitched blade, Rushton turbine), impeller diameter ( ), and rotational speed ( 2. Sizing the Impeller and Tank Core Agitator Design Formulas Beyond the fluid, the
): This is a dimensionless constant specific to the impeller type (e.g., for a Rushton turbine, for a hydrofoil). Step 3: Calculate Power ( ):
above it for thin shafts operating in super-critical zones). 4. Suggested XLS Spreadsheet Architecture
A practical XLS will include a drop-down menu of common Np values for different impellers, preventing manual look-up errors.