Orifice Flow Calculator

Orifice Flow Calculator — Calculate Flow Rate Through an Orifice

Calculate flow rate, velocity, and pressure drop through an orifice. Ideal for fluid dynamics, piping systems, HVAC, and engineering applications. Uses the standard orifice flow equation.

Step 1: Orifice & Pipe Specifications

Orifice Type

Diameter Measurements

Pipe Diameter (mm)

Orifice Diameter (mm)

Discharge Coefficient (C_d)

0.62

Standard Coefficients

Sharp-edged orifices: C_d ≈ 0.62–0.65. Rounded orifices: C_d ≈ 0.97–0.99. Beta ratio (d/D) typically between 0.2–0.7 for accurate measurement.

Step 2: Fluid & Flow Conditions

Pressure Conditions

Upstream Pressure (kPa)

Downstream Pressure (kPa)

Fluid Type

Fluid Density (kg/m³)

1.225 kg/m³

Show flow visualization

Show orifice type comparison

Flow Conditions

For accurate results, ensure flow is turbulent (Re > 4000). Pressure drop should be less than 30% of upstream pressure. Consider fluid compressibility for gases.

Orifice Flow Results

Summary

Flow Visualization

Orifice Comparison

Volumetric Flow Rate

245.8

m³/h (0.0683 m³/s)

Velocity through Orifice

34.8 m/s

Pressure Drop

400 kPa

Beta Ratio (d/D)

0.5

Reynolds Number

1.2×10⁵

Flow Visualization

Flow Regime

Turbulent

Vena Contracta

Present

Cavitation Risk

Low

Measurement Accuracy

Good

Orifice Type Comparison

Orifice Type	C_d Range	Pressure Recovery	Typical Applications

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