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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

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B

8

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C

9

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D

11

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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.

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

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