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- W2407092711 abstract "A computational fluid dynamics (CFD) technique applied to the turbulent flow of wastewater sludge in horizontal, smooth-wall, circular pipes is presented. The technique uses the Crank−Nicolson finite difference method in conjunction with the variable secant method, an algorithm for determining the pressure gradient of the flow. A simple algebraic turbulence model is used. A Bingham-plastic rheological model is used to describe the shear stress/shear rate relationship for the wastewater sludge. The method computes velocity gradient and head loss, given a fixed volumetric flow, pipe size, and solids concentration. Solids concentrations ranging from 3 to 10% (by weight) and nominal pipe sizes from 0.15 m (6 in.) to 0.36 m (14 in.) are studied. Comparison of the CFD results for water to established values serves to validate the numerical method. The head loss results are presented in terms of a head loss ratio, Rhl, which is the ratio of sludge head loss to water head loss. An empirical equation relating Rhl to pipe velocity and solids concentration, derived from the results of the CFD calculations, is presented. The results are compared with published values of Rhl for solids concentrations of 3 and 6%. A new expression for the Fanning friction factor for wastewater sludge flow is also presented." @default.
- W2407092711 created "2016-06-24" @default.
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- W2407092711 date "2005-07-01" @default.
- W2407092711 modified "2023-10-17" @default.
- W2407092711 title "A Computational Technique for Turbulent Flow of Wastewater Sludge" @default.
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- W2407092711 doi "https://doi.org/10.2175/106143005x52003" @default.
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