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- W1519235624 abstract "The longitudinal dispersion coefficient describes the change in characteristics of asolute cloud, as it travels along the longitudinal axis of a flow. Within potable waternetworks, it is important to be able quantify this parameter, to predict the fate ofsolutes introduced into the network. Current water quality models assume steady,highly turbulent flow [Tzatchkov et al., 2009]. However, this assumption is notvalid for the network's periphery, where water leaves the main network and comesto the point of consumption. Here, the flow can be both unsteady and turbulent,transitional or laminar [Buchberger et al., 2003; Blokker et al., 2008, 2010].Taylor [1954] proposed a now classical expression to predict the longitudinaldispersion coefficient within steady, turbulent pipe flow. However, experimentaldata has shown significant deviation from his prediction for Re < 20000.Within the present work, new experimental data is presented for steady andunsteady flows for a range of discharges corresponding to 2000 < Re < 50000. Fromthis experimental work, results describing the mixing processes through steady andunsteady turbulent and transitional pipe flow are presented, as well as an explana-tion as to why Taylor's theory fails to predict experimental data for Re < 20000.In addition, a simple numerical model is proposed for steady flow for 2000 <Re < 50000. The model extends Taylor's analysis to predict the longitudinal disper-sion coefficient in a manner more consistent with experimental data for Re < 20000.Furthermore, the model is extended for use within unsteady flow." @default.
- W1519235624 created "2016-06-24" @default.
- W1519235624 creator A5048506471 @default.
- W1519235624 date "2013-05-01" @default.
- W1519235624 modified "2023-09-23" @default.
- W1519235624 title "Longitudinal dispersion in steady and unsteady pipe flow" @default.
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