Question

Which of the following is the correct formula for reynolds number?

(a) Re=\(\frac{\rho Vl}{\mu}\)

(b) Re=\(\frac{PVl}{\mu}\)

(c) Re=\(\frac{\rho \mu l}{V}\)

(d) Re=\(\frac{\rho Vl}{P}\)

I got this question in semester exam.

My query is from Aircraft Force Systems in chapter Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

Right answer is (a) Re=\(\frac{\rho Vl}{\mu}\)

To explain: The correct formula for reynolds number is given by Re=\(\frac{\rho Vl}{\mu}\) where Re is Reynolds number, ρ is density of the fluid, V is the velocity of the fluid, l is the length of the fluid and μ is the dynamic viscosity of the fluid.