Reynolds Number - Pipe Flow
Reynolds number for pipe flow - the dimensionless parameter separating laminar (Re < 2300), transitional (2300–4000), turbulent (> 4000).
Re
375,000 -
Regime
Turbulent
Formula, assumptions, and limits
Ship systems mostly turbulent (Re ≥ 10⁴). Laminar flow only in fuel-line slow flow of cold HFO (high ν). Moody chart sections differ between regimes.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Flow velocity | m/s | Q/A | |
| Pipe inside diameter | m | pipe schedule | |
| Kinematic viscosity | m²/s | fluid temperature |