Fluid Mechanics

Module 6. Flow through pipes

Lesson 17
PROBLEMS ON HEAD LOSS

17.1 Numericals

Q 1. Discharge through a pipe line is 0.05 m3/s. The diameter of pipe at section AB is 10 cm which suddenly changes to 15 cm in section BC. The co-efficient of friction is 0.05 for both the pipes; determine the total head loss from A to C.

Solution

Q = 0.05 m³/s

Q 2. Diameter and length of the different sections of a pipe line is given as follows:

Junctions B and C are cases of sudden contraction & enlargement respectively. If the flow rate is 0.01 m3/s, determine total head loss in entire length of pipe. Contraction loss co-efficient is 0.45.

Q 3. Diameter & length of different sections of pipe line connected to a large tank given as below. There is an abrupt expansion & contraction at junction B & C. Water is discharged directly into open at end of pipe at D. Determine the height of water surface above the discharge point to get a velocity of 2.5 m/s at the end of pipe. Take contraction loss co-efficient as 0.45.

Solution: