Physics · Fluid Mechanics
For a solid sphere of diameter D moving with velocity V in a fluid of density ρ and viscosity μ, the drag force FD can be expressed in terms of the drag coefficient CD as: FD = CD A ρV22 Where A is the projected area of the sphere. Based on Stokes' law, for a sphere moving in an infinite fluid with a Reynolds number (Re) < 0.2, the correct expression for CD is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1CD = 12Re
- 2CD = 16Re
- 3CD = 24Re✓
- 4CD = 48Re
Correct answer
CD = 24Re
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