Decay of Pressure and Energy Dissipation in Laminar Transient Flow

In the present paper, some peculiar characteristics of transient laminar flow are dis-cussed. After presenting a review of the existing literature, attention is focused on tran-sient energy dissipation phenomena. Specifically, results of both laboratory and numericalexperiments are reported, the latter by considering one-dimensional (1D) along withtwo-dimensional (2D) models. The need of modifying a criterion for simulating unsteadyfriction proposed some years ago by one of the writers, and extensively used for water-hammer calculations, is pointed out. Differences between accelerating and deceleratingflows as well as between transients in metallic and plastic pipes are also highlighted.@DOI: 10.1115/1.1839926#Keywords: Transient, Laminar, Energy, Dissipation, Viscoelasticity

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