Water Flows Down a Pipe of Radius 5 Cm at a Speed

Multiple Choice

Water flows down a pipe of radius 5 cm at a speed of 5 cm s-1. What is the Reynolds number of this flow and will it be turbulent? The density of water is 1000 kg m-3 and the viscosity of water is 0.001 Pa s.

A) Re = 5000, so the flow is turbulent.
B) Re = 10 000, so the flow is extremely turbulent.
C) Re = 3000, so the flow is probably part laminar and part turbulent.
D) Re = 2000, so the flow is laminar.
E) Not enough information is provided to answer this question.ANS