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Air Bubble Diffusion in Supercritical Open Channel Flow

By Hubert Chanson

Abstract

Air bubble entrainment in open channels is called \u27white waters\u27. It is observed in supercritical turbulent flows. The air bubble diffusion process is analysed both analytically and experimentally in uniform equilibrium flows. The solution of the diffusion equation is compared with model and prototype data. The results indicate that the turbulent diffusivity is of the same order of magnitude as the momentum transfer coefficient (i.e. eddy viscosity.). However D_t/v_T is larger on models than on prototype, suggesting that model investigations might not reproduce accurately the air bubble diffusion process

Topics: air bubble entrainment, open channel flows, air bubble diffusion, spillways, self-aerated flows, theoretical models, 240500 Classical Physics, 240502 Fluid Physics, 260502 Surfacewater Hydrology, 290000 Engineering and Technology, 290600 Chemical Engineering, 290800 Civil Engineering, 290802 Water and Sanitary Engineering, 291100 Environmental Engineering, 300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Year: 1995
OAI identifier: oai:espace.library.uq.edu.au:UQ:9320

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