In the discussion about the viscous terms in the fluid dynamic equations it was mentioned that the Reynolds number represents the ratio between actual and molecular scalings of length times velocity. To check this model, consider a bird with a characteristic length of L = 0.2 m, flying at a speed of 14 m/s. Assuming standard conditions, c = 468 m/s and λ = 6.8 × 10-8 m, calculate the Reynolds number by the formula
and by using the definition in Eq. (6.13).
