On the influence of liquid length variation in hydraulic transients
Enrique Cabrera Marcet, Abreu J., Pérez R., Vela A.
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When a problem of hydraulic transients with water column separation with entrapped air in pipelines is faced, the variation of the length of the liquid column is not usually taken into account. In this paper, interesting mainly from an academic point of view rather than for practical aspects, it will be shown that in a system with entrapped air and without changes of potential energy at the air-water interface (horizontal pipe) the final pressure that we get in a mass oscillation is the same when we neglect the kinetic energy of the system and the liquid column length variation than the obtained from the consideration of both effects, although the instant when the maximum is achieved is different. This result is also independent of the assumed polytropic exponent for the entrapped air compression.