What is the Venturi meter flow equation?

Q = Cd × A_t × √(2ΔP / (ρ(1-β⁴))), where Cd is discharge coefficient (~0.984 for classical Venturi per ISO 5167-1), A_t is throat area (m²), ΔP is differential pressure (Pa), ρ is fluid density (kg/m³), and β = d_throat/D_pipe is the diameter ratio.

How accurate is a Venturi meter?

Classical Venturi tubes per ISO 5167-1 have typical uncertainty of ±0.75–1.0% of flow rate for machined inlets and ±1.5–2.0% for rough-cast inlets. Venturis have the lowest permanent pressure loss of differential pressure meters (~10–15% of differential pressure), making them economical for large, permanent installations.

Venturi Meter Flow Rate Calculator

Calculate volumetric flow rate through a Venturi meter using differential pressure and geometric parameters per ISO 5167-1.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How It Works

Calculate volumetric flow rate through a Venturi meter using differential pressure and geometric parameters per ISO 5167-1

Each component has a specific meaning:

Differential pressure — The differential pressure recorded for the patient or scenario being assessed.
Geometric parameters per ISO 5167-1 — The geometric parameters per iso 5167-1 recorded for the patient or scenario being assessed.

Note: Interpret the venturi meter flow result against the clinical thresholds and context described above.

How to Use

Enter the differential pressure, geometric parameters per ISO 5167-1 for the patient or scenario you are assessing. Calculate volumetric flow rate through a Venturi meter using differential pressure and geometric parameters per ISO 5167-1. Use the venturi meter flow result to inform your clinical assessment.

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