Which expression gives the Reynolds number for flow in a circular pipe?
Correct answer: C. ρVD divided by μ
- A. ρμ divided by VD
- B. μVD divided by ρ
- C. ρVD divided by μ
- D. VD divided by ρμ
Explanation
The Reynolds number is Re = ρVD/μ, or equivalently VD/ν. It compares inertial effects with viscous effects and helps distinguish laminar from turbulent flow.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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