1. What is the Flow Equation?

The flow equation \( Q = K \times \sqrt{\Delta P} \) calculates volumetric or mass flow rate through a differential pressure meter (like an orifice plate, venturi, or flow nozzle) based on the measured pressure drop.

2. How Does the Calculator Work?

The calculator uses the fundamental flow equation:

Where:

• \( Q \) — Flow rate (units depend on K)
• \( K \) — Flow coefficient (specific to the meter type and fluid)
• \( \Delta P \) — Pressure difference across the meter (Pa)

Explanation: The equation shows that flow is proportional to the square root of the pressure difference, with K accounting for meter geometry and fluid properties.

3. Importance of Flow Calculation

Details: Accurate flow measurement is essential for process control, custody transfer, and system monitoring in industries like oil & gas, chemical processing, and water treatment.

4. Using the Calculator

Tips: Enter the flow coefficient K (from meter specifications) and the measured pressure difference in Pascals. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What units does K have?
A: K's units depend on the specific application and meter type, combining factors like pipe diameter, fluid density, and discharge coefficient.

Q2: How accurate is this calculation?
A: Accuracy depends on proper K value selection and ideal flow conditions. Real-world applications may require additional correction factors.

Q3: Can this be used for any fluid?
A: The basic form works for incompressible fluids. Compressible fluids (gases) require expansion factors and density corrections.

Q4: What are typical K values?
A: K values range widely (0.6-0.8 for orifice plates, higher for venturis) and are determined through meter calibration.

Q5: When is this equation not applicable?
A: Not suitable for non-Newtonian fluids, pulsating flows, or when Reynolds number is outside the meter's specified range.