Orifice Air Volume Leakage

Overview

Engineering reference data for Orifice Air Volume Leakage in fluid mechanics.

Key Formulas

Reynolds Number

$Re = \frac{\rho v D}{\mu}$

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

$P + \frac{1}{2}\rho v^2 + \rho g h = \text{const}$

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

$A_1 v_1 = A_2 v_2$

Conservation of mass for incompressible flow.

Darcy-Weisbach

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Pressure drop due to friction in a pipe.

Variables

Nozzle Correction Factors

When calculating air volume passing through orifices, the base diagram values must be adjusted for the nozzle geometry:

• For well-rounded nozzles: Multiply diagram values by *0.97
• For sharp-edged nozzles: Multiply diagram values by *0.65

These factors account for the differing coefficients of discharge and flow characteristics at the orifice inlet.

Unit Conversions

The following standard conversions apply to the data and calculations on this page:

Note: scfm stands for standard cubic feet per minute (at standard conditions), and nl/s is normal liters per second.

References

• Original Source