Consider turbulent flow through 1 m diameter wrought iron pipe at very high pressure. Above what Reynold's number is the flow independent of Reynold's number.
Work:
Rd = Ud/v,
where U = velocity, d = inner diameter of pipe, v = kinematic viscosity
For Rd > 4,000, flow is considered turbulent, but laminar flow exists in a pipe where Rd < or = 2,300