The distribution of shear stress in a stream of fluid in a circular tube is_____________________?
Correct answer: C. Linear with radius for both laminar & turbulent flow
- A. Linear with radius for turbulent flow only
- B. Linear with radius for laminar flow only
- C. Linear with radius for both laminar & turbulent flow
- D. Parabolic with radius for both laminar & turbulent flow
Explanation
A momentum balance on a circular tube gives shear stress proportional to the distance from the tube axis, regardless of whether the flow is laminar or turbulent. The velocity profile, not the shear-stress profile, changes substantially between these regimes.
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