Orifice nozzle venturi

Reference data et engineering information about orifice nozzle venturi pour fluid mechanics applications.

orificenozzleventuriCalculatriceTableau de données

Overview

Orifice plates, nozzles, and Venturi meters are differential pressure flow meters. They create a constriction that increases velocity and decreases pressure, allowing flow rate calculation from the pressure differential.

Key Formulas

Flow Rate

$Q = C_d A_2 \sqrt{\frac{2 \Delta P}{\rho (1 - \beta^4)}}$

Discharge through a differential pressure meter.

Beta Ratio

$\beta = \frac{d}{D}$

Ratio of throat diameter to pipe diameter.

Variables

Symbol	Description	Unit
$Q$	Volume flow rate	m³/s
$C_d$	Discharge coefficient	—
$A_2$	Throat area	m²
$\Delta P$	Pressure differential	Pa
$\rho$	Fluid density	kg/m³
$\beta$	Diameter ratio	—

Reference Data

4 lignes

Comparison of differential pressure flow meters
Meter Type	Typical C_d	Beta Range	Accuracy	Pressure Loss
Orifice Plate	0.6	0.2 – 0.75	±1–2%	High
Venturi Meter	0.98	0.3 – 0.75	±1%	Low
Flow Nozzle	0.96	0.2 – 0.8	±1–2%	Medium
Wedge Meter	0.65	—	±2–5%	Medium

Source: engineeringtoolbox.com

Orifice Flow Calculator

Pressure Drop(kPa)

Orifice Diameter(mm)

Pipe Diameter(mm)

Fluid Density(kg/m³)

Discharge Coefficient

References

Original Source

Source: engineeringtoolbox.com