EngineeringToolkit

Reynolds Number Formula

A dimensionless quantity used to predict flow patterns in fluid flow situations.

Formula

Re = ρvL/μ

Discipline: Fluid Mechanics. Result unit: dimensionless.

Variables and units

  • ρ — Density (kg/m³): Fluid density
  • v — Velocity (m/s): Flow velocity
  • L — Length (m): Characteristic length
  • μ — Viscosity (Pa·s): Dynamic viscosity