The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is__________________?
Correct answer: C. 2
- A. 0.5
- B. 1
- C. 2
- D. 0.33
Explanation
In the Stokes regime, viscous or wall drag contributes two-thirds of the total drag on a sphere, while form or pressure drag contributes one-third. Their ratio is therefore (2/3)/(1/3) = 2.
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