Question

The Stoke's equation giving the terminal settling velocity of a discrete spherical particle is applicable for particle size range of

• A. 0.2 mm to 0.0002 mm.
• B. more than 0.2mm.
• C. less than 0.002 mm.
• D. any particle size.

Hint:

Stoke's law is useful in environmental and civil engineering, especially when working with sedimentation and water treatment.

Answer 1

The Correct Option is A

Stoke's law is valid for particles in the size range from 0.2 mm to 0.0002 mm. It applies under laminar flow conditions and helps in determining the terminal velocity of small particles settling in a fluid.