Orifice Flow Calculator
Calculate flow rate through orifices and sharp-edged openings using discharge coefficient
About this calculator
This orifice flow calculator determines the volumetric flow rate of fluids passing through orifices and sharp-edged openings in pipes, tanks, or vessels. By incorporating the discharge coefficient, it accounts for real-world flow conditions including velocity profile effects, flow contraction, and energy losses. This tool is essential for engineers designing fluid systems, sizing orifices for flow measurement, calculating discharge rates from tanks, and optimizing hydraulic systems in industrial, municipal, and process applications.
How to use
Enter the orifice diameter, fluid head or pressure difference across the orifice, and the discharge coefficient (typically 0.6-0.8 for sharp-edged orifices). Input fluid properties like density if required. The calculator will compute the volumetric flow rate using the orifice flow equation, providing results in your preferred units.
Frequently asked questions
What is a typical discharge coefficient for sharp-edged orifices?
Sharp-edged orifices typically have discharge coefficients between 0.60-0.65, depending on the Reynolds number and orifice geometry.
How does orifice size affect flow rate?
Flow rate increases with the square of the orifice diameter, so doubling the diameter quadruples the flow rate.
What's the difference between orifice flow and pipe flow?
Orifice flow involves sudden area contraction causing flow separation and higher pressure losses compared to gradual pipe flow.