1. What is the Centrifugal Pump Flow Rate Equation?

The centrifugal pump flow rate equation calculates the theoretical flow rate based on impeller diameter, rotational speed, and head. It's fundamental for pump selection and system design in fluid mechanics.

2. How Does the Calculator Work?

The calculator uses the centrifugal pump equation:

Where:

• \( Q \) — Flow rate (m³/s)
• \( D \) — Impeller diameter (m)
• \( n \) — Rotational speed (rev/s)
• \( H \) — Head (m)
• \( g \) — Gravitational acceleration (9.81 m/s²)

Explanation: The equation relates the pump's physical characteristics to its theoretical flow capacity, accounting for the energy imparted to the fluid.

3. Importance of Pump Sizing

Details: Proper pump sizing is critical for system efficiency, energy consumption, and preventing cavitation or excessive wear. This calculation provides the theoretical maximum flow rate under ideal conditions.

4. Using the Calculator

Tips: Enter impeller diameter in meters, rotational speed in revolutions per second, and head in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between theoretical and actual flow rate?
A: Actual flow rate is typically lower due to factors like efficiency losses, friction, and system resistance.

Q2: How does impeller diameter affect flow rate?
A: Flow rate increases with the square of the impeller diameter - doubling diameter quadruples flow rate (theoretically).

Q3: What is "head" in pump calculations?
A: Head represents the energy imparted to the fluid, expressed in meters of fluid column.

Q4: Are there limitations to this equation?
A: Yes, it doesn't account for viscosity changes, efficiency losses, or system characteristics like pipe friction.

Q5: How accurate is this calculation for real-world applications?
A: It provides a theoretical maximum - actual system design should include safety factors and efficiency considerations.