THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal
ISBN Print: 978-1-56700-302-4
ISSN: 2377-2816
Behaviour of time-dependent bedforms in closed pipe flow
pages 765-774
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.830
RESUMO
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.