Abstract
Since olden times fluid has mostly been used mechanically for generating motive power, but in recent times it has been used for power transmission or automatic power control. High-pressure fluid has to be used in these systems for high speed and fast response. Consequently, the issue of unsteady flow has become very important. In this chapter, the oscillation of a liquid column with frictional resistance will be explained first, followed by the propagation of pressure in a pipeline, the time-dependent return to steady flow conditions after the sudden opening of a valve, the velocity of pressure waves in an elastic pipeline, water hammer in the case of instantaneous valve closure and a fluidic oscillator.
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