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The transport of fly ash pastes through pipelines
Fly ash and water mixtures were pumped through a closed loop pipeline at various flow rates and solids concentrations, ranging from 51% to 74% by mass, while the pressure losses were measured.
This procedure was carried out in three different pipe sizes, 40, 50, and 65 nominal bore. The resulting data is
graphically represented as both flow rate versus pressure gradient as well as bulk shear rate versus wall shear
stress diagrams.
These results are then evaluated for laminar and turbulent conditions as well as laminar to turbulent transitions
using transition models from the literature. It is concluded that the transitional flow behaviour is distinctly dissimilar from other industrial viscoplastic slurries and that this has an effect on the pipeline designer in terms of pump and motor selection.
Keywords: fly ash, rheology, viscosity, pressure losses, closed loop pipeline, laminar and turbulent flow, transitions.
To download the paper, click here.
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