CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Fluid Mechanics

Water Hammer in Pipes

In a pressure...

Question

In a pressure penstock 4500 m long, water is flowing at a velocity of 4 m/s. If the velocity of the pressure wave travelling in the pipe, due to sudden complete closure of a valve at the downstream end, is given as 1500 m/s, what would be the period of oscillation in seconds under frictionless conditions?

A

6

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

8

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

9

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

11

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A 6
Time period of oscillation refers to the total time that the wave takes to start from the closed valve and reach back at the same location after travelling the entire length of penstock twice.

$T = \frac{2 \times 4500}{1500} = 6 s$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A penstock is 2000 m long and the velocity of pressure wave in it is 1000 m/s. Water hammer pressure head for instantaneous closure of valve at the downstream end of pipe is 60 m. If the valve is closed in 4 sec, then the peak water hammer pressure head is equal to

Q. A flow control valve at the end of a 1 km long pipe is closed gradually in 10 seconds. If the rise of pressure head due to water hammer is 20 meters of water. What the velocity of water before the valve closure?

(g = 10 m / s^{2})

Q. A liquid of density

ρ

and bulk modulus K flows with a mean velocity V in a long rigid pipe of diameter D. A sudden closure of a valve at the downstream end of the pipe will produce a maximum water hammer head of

Q. In a pipeline 1920 m long, the velocity of propagation of pressure wave is 960 m/s. Rapid closure of a downstream valve will entail, when the maximum time for the closure is:

Q. Two reservoir maintain a constant difference of water levels of 11.25 m and are connected by a 10 cm diameter pipeline of 294.3 m length. The total of all head losses, by friction valve losses, bend losses, inlet and exit losses, and velocity head can be taken as

98.1 v^{2} / 2 g

(in m) where v is the flow velocity through the pipe (in m/sec). Assuming that the valve at the downstream end is suddenly opened so that there is no pressure wave, what will be the time taken for the velocity of flow in the pipe to attain 95% of the steady terminal velocity? Take

\frac{1}{9.81} = 0.102

.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Water Hammer in Pipes

FLUID MECHANICS

Watch in App

explore_more_icon

Explore more

Water Hammer in Pipes

Other Fluid Mechanics

Join BYJU'S Learning Program

CrossIcon