of the tank diameter above the vessel floor for general applications, or lower for solids suspension. 3. Power Consumption Calculations

The Power Number is a dimensionless constant specific to the geometry of the impeller. It is typically obtained from empirical charts plotting Npcap N sub p for specific impeller designs. In fully turbulent flow, Npcap N sub p becomes constant. Step 3: Calculate the Power Consumption ( Npcap N sub p

Every impeller style (e.g., Rushton turbine, hydrofoil, pitched blade) has a characteristic Power Number ( Npcap N sub p

The design journey begins with a clear definition of process results and conditions. Critical parameters to define upfront include:

Operating density and viscosity must be calculated at peak process temperatures to account for worst-case torque scenarios. Reynolds Number (

Once the power is known, the shaft must be sized to prevent failure from torque and vibration. Derived from the power and speed.

Hydraulic forces acting unevenly on the impeller blades create a lateral force ( Fhcap F sub h

: This is calculated based on torque and bending moments to prevent snapping or excessive deflection.

[ Re = \fracD^2 \cdot N \cdot \rho\mu ]

The operational integrity of an agitation system relies heavily on identifying the correct dimensionless criteria before sizing your drive motor. Using validated empirical formulas guarantees process scalability from bench-top jar testing to a multi-ton industrial reactor.