1. What is Agitator Mixer Power Requirement?

The agitator mixer power requirement calculation determines the power needed to drive an impeller in a fluid. This is essential for proper mixer design and selection of appropriate motors for industrial mixing applications.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( P \) — Power requirement (W)
• \( \rho \) — Fluid density (kg/m³)
• \( N_p \) — Power number (unitless)
• \( N \) — Rotational speed (s⁻¹)
• \( D \) — Impeller diameter (m)

Explanation: The power number depends on impeller type and flow regime (laminar, transitional, or turbulent).

3. Importance of Power Calculation

Details: Accurate power calculation ensures proper motor sizing, prevents equipment failure, optimizes energy consumption, and ensures efficient mixing performance.

4. Using the Calculator

Tips: Enter fluid density in kg/m³, power number (typically 0.5-5 for common impellers), rotational speed in revolutions per second, and impeller diameter in meters.

5. Frequently Asked Questions (FAQ)

Q1: What is the power number (N_p)?
A: The power number is a dimensionless parameter that relates impeller geometry and flow regime to power consumption.

Q2: How do I determine the power number?
A: Power numbers are typically obtained from manufacturer data, literature, or experimental correlations based on impeller type and Reynolds number.

Q3: What are typical power number values?
A: For standard impellers: Rushton turbine ~5, pitched blade turbine ~1.5, marine propeller ~0.5, anchor ~0.3 (laminar flow).

Q4: Does this equation account for non-Newtonian fluids?
A: The basic equation applies to Newtonian fluids. For non-Newtonian fluids, apparent viscosity and modified power numbers must be used.

Q5: What about scale-up considerations?
A: Power per unit volume generally decreases with scale-up. Geometric similarity and constant power per unit volume are common scale-up criteria.