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Exhaust Pipe Diameter from Flow Rate Calculator — result sheet
Estimate the circular flow area and internal diameter needed for a chosen volumetric flow and target average gas velocity.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Continuity gives Q = vA; circular area A = Q/v; internal diameter d = √(4A/π).
The result turns a flow requirement into a geometric starting point. It is an average-area estimate, not an engine-specific exhaust design or noise prediction.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Volumetric flow rate — m³/s; minimum 1.0E-6; maximum 1000000
- Target average velocity — m/s; minimum 1.0E-6; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Volumetric flow rate | 0.25 |
| Target average velocity | 30 |
Required area ≈ 0.008333 m² and internal diameter ≈ 0.1030 m (103.0 mm).
Assumptions and limits
- Flow rate and velocity describe the same section and use SI units.
- The passage is treated as a circular pipe with uniform average velocity.
- Temperature, pressure, pulsing, back-pressure, bends, catalyst restrictions, and local vehicle rules are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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