The ratio of wall drag to total drag in the Stoke's law range is_________________?
Correct answer: A. 2/3
- A. 2/3
- B. 1
- C. 1/3
- D. 0.5
Explanation
In creeping flow around a sphere, viscous wall or skin-friction drag contributes two-thirds of the total Stokes drag, while pressure drag contributes one-third. Hence the wall-drag to total-drag ratio is 2/3.
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