Reynolds Number Calculator
Fluid Flow Analysis
Calculate the Reynolds number to determine flow regime (laminar, transitional, or turbulent) in pipes and channels.
Flow Parameters
Reynolds Number Formula
Re = (ρ × v × D) / μ
Where ρ is density, v is velocity, D is characteristic length (diameter), and μ is dynamic viscosity.
Flow Regimes
Laminar Flow
Smooth, orderly flow in parallel layers
Transitional Flow
Mixed flow characteristics, unstable
Turbulent Flow
Chaotic, irregular flow with eddies
Common Fluids
Water (20°C)
ρ = 1000 kg/m³, μ = 0.001 Pa·s
Air (15°C)
ρ = 1.225 kg/m³, μ = 0.0000181 Pa·s
Oil (SAE 30)
ρ = 920 kg/m³, μ = 0.29 Pa·s
Applications
- Pipe flow design
- Heat exchanger analysis
- Aerodynamic studies
- Chemical process engineering
- HVAC system design
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