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Behaviour of time-dependent bedforms in closed pipe flow

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.830
pages 765-774

H. Rice
School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK

T. N. Hunter
School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom

J. Peakall
School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK

Simon R. Biggs
School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom

Michael Fairweather
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

Sinopsis

Measurements of time-dependent bedforms produced by the deposition of solid particles from two-phase liquid-solid flows were performed using a novel ultrasonic echo method in a 100-litre, closed-pipe slurry flow loop. Results are presented for the settled bed and sheet-flow layer thicknesses over a range of flow rates. In addition, observations are also presented of path-dependent equilibration, and bi-periodic, possibly cyclical behaviour in plane beds and ripples, respectively. A phase diagram of bedforms in closed pipes is derived in which the thresholds between incipient particle motion and stable and unstable beds are established.

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