000162569 001__ 162569
000162569 005__ 20190316235023.0
000162569 0247_ $$2doi$$a10.1016/j.ijmultiphaseflow.2010.10.007
000162569 022__ $$a0301-9322
000162569 02470 $$2ISI$$a000287341500001
000162569 037__ $$aARTICLE
000162569 245__ $$aSelf-entrainment of air on stepped spillways
000162569 260__ $$bElsevier$$c2011
000162569 269__ $$a2011
000162569 336__ $$aJournal Articles
000162569 500__ $$a[758]
000162569 520__ $$aThe pseudo-bottom-inception point related to air entrainment is located further upstream on stepped spillways than on smooth spillways, for otherwise identical conditions. Its position is relevant concerning cavitation aspects, flow losses and flow depths. This Paper presents and discusses visual observations made with a high-speed camera and air concentration measurements in the vicinity of the pseudobottom air inception point on a stepped model spillway. Insight into the bottom aeration processes is provided, pointing at the effects of dynamic and turbulent air-phase surface troughs instantaneously protruding to the pseudo-bottom. In addition, the measured data were analyzed with regard to the extensions of these surface troughs. The trough bases were found to reach approximately 70–80% of the mixture flow depth upstream of the inception point, to 60–70% at the inception point and to 40–50% at the equilibrium flow region downstream of the inception point. The highly-turbulent character of developed flow is described and the general air transport process specified on the basis of air concentrations and related parameters.
000162569 6531_ $$aAir, bubble, entrainment, inception point, stepped spillway
000162569 700__ $$0244418$$g202221$$aPfister, Michael
000162569 700__ $$aHager, Willi H.
000162569 773__ $$j37$$tInternational Journal of Multiphase Flow$$q99-107
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