The fluid jet discharging from a 2″ diameter orifice has a diameter of 1.75″ at its venacontracta. The co-efficient of contraction is___________________?
Correct answer: B. 0.766
- A. 1.3
- B. 0.766
- C. 0.87
- D. None of these
Explanation
The coefficient of contraction is the vena-contracta area divided by the orifice area: Cc = (1.75/2.00)² = 0.766. It is an area ratio, not the simple diameter ratio of 0.875.
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