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. pp. 1-16.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website:


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.

Item ID: 73352
Item Type: Article (Research - C1)
ISSN: 1879-3533
Copyright Information: © 2017 Published by Elsevier Ltd.
Date Deposited: 25 Aug 2022 04:57
FoR Codes: 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401211 Multiphysics flows (incl. multiphase and reacting flows) @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering @ 100%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page