1. What is the Flow Rate Equation?

The flow rate equation Q = K × √P calculates the flow rate in gallons per minute (GPM) based on the flow constant and pressure in PSI. This equation is commonly used in fluid dynamics, irrigation systems, and hydraulic engineering.

2. How Does the Calculator Work?

The calculator uses the flow rate equation:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( K \) — Flow constant (GPM/√PSI)
• \( P \) — Pressure (PSI)

Explanation: The equation shows that flow rate is proportional to the square root of pressure, with the flow constant K representing the system's efficiency.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for designing efficient fluid systems, optimizing pump performance, ensuring proper irrigation coverage, and maintaining system pressure requirements.

4. Using the Calculator

Tips: Enter the flow constant K (specific to your system or nozzle) and pressure P in PSI. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the flow constant K?
A: The flow constant K is a characteristic value specific to each system, nozzle, or orifice that relates pressure to flow rate.

Q2: How do I determine the K value for my system?
A: K can be determined experimentally by measuring flow rate at a known pressure and calculating K = Q/√P.

Q3: Why is the relationship square root rather than linear?
A: The square root relationship comes from the Bernoulli equation and reflects the energy conservation principle in fluid dynamics.

Q4: What are typical K values for common systems?
A: K values vary widely depending on the application - from small nozzles (K=0.1-1.0) to large irrigation systems (K=5.0-20.0).

Q5: Can this equation be used for all fluids?
A: This specific form is calibrated for water. For other fluids, viscosity and density corrections may be needed.