The percentage of differential pressure lost across a Venturi meter featuring a 15° taper is roughly___________________?
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Answer: B. 10
Explanation
Fluid flowing through a Venturi meter experiences pressure drops due to constriction and friction. A standard fifteen-degree diverging taper allows gradual pressure recovery without flow separation. Empirical testing demonstrates that this specific design incurs a permanent pressure loss of about 10 percent. Venturi meters measure fluid flow rates by constricting flow and applying Bernoulli's principle. The converging section accelerates fluid, while the diverging recovery cone reduces permanent pressure loss. Differential pressure gauges measure the pressure drop across the inlet and the throat section.
Flow measurement in industrial pipelines utilizes Venturi meters for high accuracy and low head loss. Minimizing permanent pressure loss reduces pumping energy costs in large fluid transport systems. Hydraulic engineers rely on standard meter geometries to ensure predictable discharge coefficients. Option A is incorrect because one percent is too low for standard Venturi meter friction losses. Option B is correct because the permanent pressure loss is roughly 10 percent of the measured difference. Option C is incorrect because 25 percent exceeds the typical loss of a well-designed 15-degree taper.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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