Topic: Fluid Mechanics
A fluid jet discharging from a 100 mm diameter orifice has a diameter of 80 mm at its vena contracta. The coefficient of contraction is
- A. 0.8
- B. 1.25
- C. 0.2
- D. 0.64
Answer: D. 0.64
Explanation: Given, $d_{orifice}=100~mm$, $d_{vena~contracta}=80~mm$. Coefficient of contraction $C_{c}=\frac{\text{Area of vena contracta}}{\text{Area of orifice}} = \frac{\pi(80)^{2}/4}{\pi(100)^{2}/4} = 0.64$.