By B.E.A. Jacobs
This e-book advantages clients, brands and engineers through drawing jointly an total view of the know-how. It makes an attempt to provide the reader an appreciation of the level to which slurry delivery is shortly hired, the theoretical foundation for pipeline layout, the practicalities of layout and new advancements.
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As shown, they are coincident between the stated limits, but divergent outside them. This illustrates two points. Firstly, extrapolation beyond the measured range is dangerous, even for unscattered data. Secondly, in the context of the three-parameter model, yield stress, consistency and index are strongly sensitive to shear rate range, and may not correlate well against such variables as solids concentration or PSD. As illustrated, an attempt to fit Bingham plastic or power law curves to the data might not solve the Prediction of flow parameters 41 problem, especially if extrapolation is attempted.
90 and 91) and tested with varying success. Johnson (82) describes a method for distinguishing wall slip or phase separation from thixotropy in rotational instruments. 4 Thixotropy and time dependency This is included here as a ‘secondary effect’ but can be a very important aspect in such fluids as clays, very fine coal slurries and kaolin. The reduction in apparent viscosity with shear (thixotropy), or increase with shear (rheopexy) and the subsequent build up or decrease of viscosity on standing are frequently characterised by time constants describing the change in the fluid yield stress or consistency index.
Since the prediction technique requires the estimation of certain factors by means of experiment, the analysis was limited to interpolation or extrapolation of results to other flow situations. 165–13 mm nominal diameter. The model is complex and the good correlation with experiment Design of slurry transport systems 32 represents a substantial achievement. In a following paper, Roco and Shook (44) extended the analysis to cover a range of particles size distributions and applied the results to coal slurry flows in pipes up to 495 mm diameter.
Design of Slurry Transport Systems by B.E.A. Jacobs