A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?
Correct answer: C. Drag, gravitational and buoyancy forces are important
- A. Inertial and drag forces are important
- B. Drag force and gravitational forces are important
- C. Drag, gravitational and buoyancy forces are important
- D. None of the above
Explanation
At Reynolds number below 1, viscous drag balances the effective weight of the particle, which is the gravitational force reduced by buoyancy. Thus drag, gravitational, and buoyancy forces are all relevant.
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