Orifice nozzle venturi

Reference data und engineering information about orifice nozzle venturi für fluid mechanics applications.

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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 Zeilen

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

Quelle: engineeringtoolbox.com

Orifice Flow Calculator

Pressure Drop(kPa)

Orifice Diameter(mm)

Pipe Diameter(mm)

Fluid Density(kg/m³)

Discharge Coefficient

References

Original Source

Quelle: engineeringtoolbox.com