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

Question

Quizplus · Accepted Answer

The Reynolds number (Re) is calculated using the formula Re = (density * velocity * diameter) / viscosity. Converting the radius to meters (0.05 m), the diameter is 0.1 m. Re = (1000 kg/m³ * 0.05 m/s * 0.1 m) / 0.001 Pa·s = 5000, indicating turbulent flow.

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