Water flows steadily through a horizontal pipe whose diameter decreases, with head losses neglected. What happens to the static pressure?
Correct answer: B. It decreases because velocity increases
- A. It increases because velocity increases
- B. It decreases because velocity increases
- C. It remains constant because elevation is unchanged
- D. It becomes zero at the smaller diameter
Explanation
The smaller area causes velocity to increase according to continuity. Bernoulli's equation then shows that static pressure decreases when elevation and losses are unchanged.
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About Hydraulics and Water Resources
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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