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- W2005181573 abstract "Stratified two-phase pipe flow of air and water is studied in a horizontal transparent pipe of 50 mm inner diameter with the goal of obtaining detailed velocity measurements and wave characteristics in the flowing liquid layer. The velocity field below the moving interface was measured by combining planar PIV and a profile capturing technique. Depending on the flow rates of air and water, the liquid layer can be laminar, transitional or turbulent, and the interface can be smooth or wavy. Conditional averaging based on the wave phase was applied in order to decompose the velocity field into three components: time-averaged velocity, wave-induced fluctuations and turbulence-induced fluctuations. Detailed interface statistics and phase-averaged velocity fields were obtained for laminar and turbulent wavy cases. The waves are shown to be asymmetric, with gravitational and capillary forces of similar magnitude. The linear wave theory provides a good approximation of the wave-induced velocity profiles. In the region close to the interface, however, the wave nonlinearity caused a deviation. In turbulent cases, a deviation was also observed close to the pipe wall, due to the existence of an oscillatory boundary layer. The separation of wavy and turbulent motion was only partly successful due to the wide range of wavelengths and heights occurring in all the wavy cases." @default.
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- W2005181573 date "2014-06-01" @default.
- W2005181573 modified "2023-10-14" @default.
- W2005181573 title "PIV measurements of waves and turbulence in stratified horizontal two-phase pipe flow" @default.
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- W2005181573 doi "https://doi.org/10.1016/j.ijmultiphaseflow.2014.03.001" @default.
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