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For a sphere falling at terminal velocity in the Stokes’ law range, the drag… — Answer & Solution | Civexa

Fluid Mechanics & Hydraulics · Flow Past Immersed Bodies

Flow Past Immersed Bodies MCQ with answer and solution

For a sphere falling at terminal velocity in the Stokes’ law range, the drag coefficient C D is given by

Solution

Concept

Drag coefficient in Stokes range

Formula

CD = 24/Re

Step-by-step solution

1. Drag F = 3πμDV; CD = F/(½ρV²πD²/4) = 24/Re.

Explanation

For Re < 1 the drag coefficient is 24/Re.

Why the other options are wrong

64/Re is for laminar pipe friction.

Shortcut

Sphere CD = 24/Re.

Correct answer: C) 24/Re

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