A numerical model with gas release and absorption has been developed in this paper and used to compute the fluid pressure transients in the pumping mains of pumping installations with air entrainment. Free and dissolved gases in the transported fluid, and cavitation at vapour pressure are also modelled. When compared with the gas free case, computations show that entrained, entrapped or released gases amplified the positive pressure peak, increase surge damping and produces asymmetric pressure surges. While the upsurge with air entrainment in the pipelines was considerably amplified, the down-surge was only marginally reduced.
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