Author(s): I. W. M. Ivo Pothof; F. H. L. R. Francois Clemens
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Abstract: Pressurised wastewater mains are subject to gas pockets that may accumulate in downward slopes. Such gas accumulations cause an additional head loss that may result in a dramatic capacity reduction; especially in delta areas with negligible static head. The available literature on the required velocity, to transport gas pockets to the bottom of an inverted siphon, is limited (Pothof 2008). Furthermore, literature on the rate of gas transport is hardly available (Lubbers 2007a), (Lubbers and Clemens 2006). The modelling of gas transport in hydraulic jumps requires a suspended bubble model that is valid both in fully developed boundary layer flows and in decelerating jet flows. This paper proposes a more generalised approach for the eddy viscosity model and explores the most appropriate turbulence variable to model the eddy viscosity profile in hydraulic jumps. Such an eddy viscosity model is considered essential for a reliable predictive model of the gas transport processes in hydraulic jumps in closed conduits.
Year: 2009