Calcolatrice Numero di Reynolds Gratuita

Calcola il numero di Reynolds per determinare il regime di flusso.

m/s
m
m^2/s

Reynolds Number

200,000

Laminar Threshold (Re < 2300)2,300

Reynolds Number vs Flow Velocity (V)

Vedi formula →

Formula

## Reynolds Number The Reynolds number is a dimensionless quantity that predicts whether fluid flow will be laminar or turbulent. ### Formula **Re = V D / nu** where V is the mean velocity, D is the pipe inner diameter, and nu is the kinematic viscosity. For pipe flow: Re < 2300 is laminar, 2300 < Re < 4000 is transitional, and Re > 4000 is turbulent.

Esempio Risolto

Water at 20 deg C (nu = 1e-6 m^2/s) flowing at 2 m/s through a 100 mm pipe.

  1. 01Re = 2 x 0.1 / 1e-6 = 0.2 / 1e-6 = 200,000
  2. 02Since 200,000 >> 4000, flow is fully turbulent.