Reynolds Number

Calculate the flow regime in a length of pipe

Inputs

Answer

unitless
unitless

Governing Equation

The Reynolds number equation is:

Re=di∗v∗ρμRe = \frac{d_{i}* v* \rho}{\mu}

Where:

Re=Re =
Reynolds Number
v=v =
Fluid velocity
ρ=\rho =
Fluid density
di=d_{i} =
Inner pipe diameter
μ=\mu =
Fluid dynamic viscosity

The flow regime is:

  • Laminar: Re <= 2,000
  • Transition: 2,000 > Re < 4,000
  • Turbulent: Re >= 4,000