Calculation
Re = ρ · v · D / μ
Low Re suggests laminar and high Re turbulent flow; thresholds depend on geometry and disturbances.
Re = ρvD/μ
Reynolds number for pipe flow
Low Re suggests laminar and high Re turbulent flow; thresholds depend on geometry and disturbances.
MINTSI
02
Result
Select a target and calculate.
Understand the inputs
- Reynolds number Re — Dimensionless ratio of inertial to viscous forces.
- Density ρ — Fluid density at operating temperature.
- Mean velocity v — Mean pipe velocity.
- Internal diameter D — Hydraulic diameter of the line.
- Dynamic viscosity μ — Fluid viscosity at temperature.
Example
Water, 1 m/s and 35.7 mm at 1 mPa·s gives Re ≈ 35,700.
Assumptions and limits
Round, fully developed pipe flow.
Sources