Which flow measuring device exhibits the highest discharge coefficient ?
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Answer: B. venturimeter
Explanation
A venturimeter features smooth converging and diverging cones that prevent boundary layer separation and eddies. Streamlined internal geometry minimizes hydraulic friction and turbulence losses throughout the pressure transition zones. This efficient energy recovery yields the highest discharge coefficient among standard flow measuring instruments. Discharge coefficient represents the ratio of actual measured flow rate to theoretical ideal flow rate. Sharp edges and abrupt expansions cause flow separation, creating large eddies and lower discharge coefficients. Differential pressure devices require accurate calibration curves to account for minor frictional energy losses.
Accurate discharge coefficients ensure precise billing and monitoring in municipal water supply systems. Hydraulic laboratory testing relies on high-coefficient meters to calibrate secondary instrumentation systems. Engineers select venturimeters for critical pipeline locations where minimizing permanent head loss is paramount. Sharp edged orifices cause severe flow contraction and turbulence separation, lowering their discharge coefficients. Borda mouthpieces experience internal flow separation unless running completely full under specific head conditions. Cipolletti weirs use trapezoidal notches designed to eliminate side contraction corrections rather than maximizing pipe coefficients.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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