1. What is a Venturi Meter Flow Calculator?

Definition: This calculator determines the volumetric flow rate through a venturi meter using pressure differential measurements.

Purpose: It helps engineers and technicians measure fluid flow rates in pipes using the venturi effect principle.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Volumetric flow rate (gallons per minute)
• \( C_d \) — Discharge coefficient (dimensionless)
• \( A \) — Cross-sectional area of throat (square feet)
• \( \Delta P \) — Pressure drop (psi)
• \( \rho \) — Fluid density (pounds per cubic foot)

Explanation: The formula relates the pressure difference between the inlet and throat of the venturi to the flow rate, accounting for fluid properties and meter characteristics.

3. Importance of Venturi Meter Calculations

Details: Accurate flow measurement is critical for process control, system monitoring, and equipment protection in fluid systems.

4. Using the Calculator

Tips: Enter the discharge coefficient (typically 0.95-0.98), throat area, measured pressure drop, and fluid density (62.4 lb/ft³ for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical discharge coefficient (C_d) value?
A: For well-designed venturi meters, C_d typically ranges from 0.95 to 0.98.

Q2: Why is the 448.83 factor included?
A: This converts the flow rate from cubic feet per second to gallons per minute (1 ft³/s = 448.83 GPM).

Q3: How do I determine the throat area?
A: Calculate using A = π × (d/2)² where d is the throat diameter in feet.

Q4: What fluids can this calculator be used for?
A: It works for any Newtonian fluid (water, oil, etc.) when proper density is entered.

Q5: How accurate is this calculation?
A: With proper C_d and accurate measurements, venturi meters can achieve ±1% accuracy.