For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?
Correct answer: A. Increase
- A. Increase
- B. Decrease
- C. Remain constant
- D. Either A. or B.; depends on other factors
Explanation
At a fixed Reynolds number, increasing the orifice-to-pipe diameter ratio generally increases the discharge coefficient because the relative effects of vena-contracta and wall interference change. The coefficient is not constant as the diameter ratio changes.
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