1. What is a Flow Rate Calculator from Pressure Drop?

Definition: This calculator estimates the volumetric flow rate through an orifice or restriction based on pressure drop and fluid properties.

Purpose: It helps engineers and technicians determine fluid flow rates in piping systems, valves, and other flow restrictions.

2. How Does the Calculator Work?

The calculator uses the orifice flow approximation formula:

Where:

• \( Q \) — Volumetric flow rate (m³/s)
• \( A \) — Cross-sectional area (m²)
• \( \Delta P \) — Pressure drop across restriction (Pa)
• \( \rho \) — Fluid density (kg/m³)

Explanation: The formula calculates flow rate based on the energy balance between pressure energy and kinetic energy.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation is crucial for system design, process control, and equipment sizing in fluid systems.

4. Using the Calculator

Tips: Enter the cross-sectional area in m², pressure drop in Pascals, and fluid density in kg/m³ (default 1000 for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What assumptions does this calculation make?
A: It assumes incompressible flow, no friction losses, and a discharge coefficient of 1 (ideal orifice).

Q2: How accurate is this calculation?
A: It provides a theoretical maximum; actual flow rates will be lower due to friction and other losses.

Q3: What's a typical fluid density?
A: Water is 1000 kg/m³, air is about 1.2 kg/m³ at standard conditions.

Q4: Can I use this for gases?
A: Only for small pressure drops where gas compressibility is negligible.

Q5: How do I account for real-world conditions?
A: Multiply the result by a discharge coefficient (typically 0.6-0.8 for orifices).