Topic: Fluid Mechanics
A pipe of 0.1 m² suddenly changes to 0.5 m² area. The quantity of water flowing in the pipe is 0.5 m³/s. Head loss due to sudden enlargement is nearly
- A. 0.025 m
- B. 0.05 m
- C. 0.8 m
- D. 1.2 m
Answer: C. 0.8 m
Explanation: V1 = Q/A1 = 0.5/0.1 = 5 m/s. V2 = Q/A2 = 0.5/0.5 = 1 m/s. Head loss due to sudden enlargement h = (V1 - V2)^2 / 2g = (5 - 1)^2 / 20 = 16 / 20 = 0.8 m.