Question

What is the correct formula for reynolds number please tell fast

Answer 1

where:

v is the maximum velocity of the object relative to the fluid (SI units: m/s)

L is a characteristic linear dimension, (travelled length of the fluid;hydraulic diameter when dealing with river systems) (m)

t denotes the time

μ is the dynamic viscosity of the fluid (Pa·s or N·s/m^2 or kg/(m·s))

ν (nu) is the kinematic viscosity (ν = μ/ρ) (m^2/s)

ρ is the density of the fluid (kg/m^3)