The influence of relative fluid depth on initial bedform dynamics in closed, horizontal pipe flow

Rice, Hugh P. , Fairweather, Michael, Hunter, Timothy N., Peakall, Jeffrey and Biggs, Simon R. (2017) The influence of relative fluid depth on initial bedform dynamics in closed, horizontal pipe flow. International Journal of Multiphase Flow, 93 1-16. doi:10.1016/j.ijmultiphaseflow.2017.03.007


Author Rice, Hugh P.
Fairweather, Michael
Hunter, Timothy N.
Peakall, Jeffrey
Biggs, Simon R.
Title The influence of relative fluid depth on initial bedform dynamics in closed, horizontal pipe flow
Journal name International Journal of Multiphase Flow   Check publisher's open access policy
ISSN 0301-9322
1879-3533
Publication date 2017-07-01
Sub-type Article (original research)
DOI 10.1016/j.ijmultiphaseflow.2017.03.007
Open Access Status Not yet assessed
Volume 93
Start page 1
End page 16
Total pages 16
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2018
Language eng
Formatted abstract
Measurements of time-dependent bedforms produced by the deposition of solid plastic particles in two-phase liquid-solid flows were performed using a novel ultrasonic echo method and via video image analysis in a 100-liter, closed-pipe slurry flow loop. Results are presented for the settled bed thicknesses over a range of nominal flow rates and initial bed depths and are combined into several phase diagrams based on various combinations of parameters, with the bedforms categorized into five types. The novel observation is made that the type of bedform that arises depends on both the flow rate and the initial relative bed or fluid depth, with both ripples and dunes being observed in the same system and in a single experiment. In addition, the critical Shields number at incipient particle motion is measured to be θsc = 0.094 ± 0.043, hysteretic behavior is observed, and the evolution and scaling of each time-dependent type of bedform is analyzed in detail and compared against several expressions for initial and equilibrium dimensions from the literature. A number of universal scalings for bedforms in any type of conduit are proposed with a view ultimately to unifying the observations of bedforms in pipes with those in channels and natural flows.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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