Reynolds Number
Determine flow regime
Input Parameters
Valid
Reynolds Number
0.00
Formula
Re = (ρ × v × D) / μ
Fill in the values on the left and click Calculate to see your result.
Formula
Re = (ρ × v × D) / μ
Reynolds number indicates whether flow is laminar or turbulent.
Assumptions
- Water at 1000 kg/m³
- Steady-state operation
Step 1: Calculate velocity
v = 3.395 m/s
Step 2: Convert viscosity
μ = 1.0 cSt × 1e-6 = 1e-6 m²/s
Step 3: Apply formula
Re = v × D / ν = 3.395 × 0.025 / 1e-6 = 84,883
Frequently Asked Questions
What do Reynolds numbers mean?
< 2300: Laminar, 2300-4000: Transitional, > 4000: Turbulent