Reynolds number

Non-dimensional ratio (Re) of the inertial force to the viscous force in fluid motion.

Source:Service de « Travaux publics et Services gouvernementaux Canada »

Formula

{\mathrm {Re}}={\frac {VL}{\nu }} where V is the mean velocity of the object relative to the fluid in m/s, L is the characteristic dimension in m and v the kinematic viscosity in m²/s.