1. What is the Agitator Power Equation?

The agitator power equation calculates the power required for mixing in chemical reactors. It is essential for designing efficient mixing systems and selecting appropriate motor sizes for industrial applications.

2. How Does the Calculator Work?

The calculator uses the agitator power equation:

Where:

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

Explanation: The equation relates power consumption to fluid properties and agitator geometry, with the power number depending on impeller type and flow regime.

3. Importance of Agitator Power Calculation

Details: Accurate power calculation ensures proper mixing efficiency, prevents motor overload, optimizes energy consumption, and maintains process consistency in chemical reactions.

4. Using the Calculator

Tips: Enter power number based on impeller type, fluid density in kg/m³, rotational speed in revolutions per second, and impeller diameter in meters. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the power number (N_p)?
A: The power number is a dimensionless parameter that depends on impeller type, geometry, and flow regime (laminar or turbulent).

Q2: How do I determine the power number?
A: Power numbers are typically obtained from experimental correlations or manufacturer data for specific impeller types.

Q3: What are typical power number values?
A: Common values range from 0.3-6.0, with radial flow impellers having higher values than axial flow impellers.

Q4: Does this equation work for all flow regimes?
A: The equation is primarily valid for turbulent flow. For laminar flow, additional corrections may be needed.

Q5: How does viscosity affect power consumption?
A: Higher viscosity fluids generally require more power for mixing, which is reflected in the power number correlations.