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Experimental study of bedforms obtained with floating particles in a pipe flow

Published online by Cambridge University Press:  20 January 2015

D. Edelin ,
C. Josset ,
C. Castelain  and
F. Fayolle
D. Edelin*
Affiliation:
Laboratoire de Thermocinetique de Nantes, CNRS UMR 6607, Rue Christian Pauc, École Polytechnique de l’Université_de Nantes, 44300 Nantes, France
C. Josset
Affiliation:
Laboratoire de Thermocinetique de Nantes, CNRS UMR 6607, Rue Christian Pauc, École Polytechnique de l’Université_de Nantes, 44300 Nantes, France
C. Castelain
Affiliation:
Laboratoire de Thermocinetique de Nantes, CNRS UMR 6607, Rue Christian Pauc, École Polytechnique de l’Université_de Nantes, 44300 Nantes, France
F. Fayolle
Affiliation:
GEPEA, UMR 6144 CNRS, Rue de la Géraudière, ONIRIS Departement Génie des Procédés Alimentaires, 44322 Nantes, France
*
†Email address for correspondence: [email protected]
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Abstract

We investigate experimentally the formation of bedforms caused by the sustained flow of water and solid particles in a circular pipe ($\varnothing =30~\text{mm}$). The special feature of the tests carried out was the use of floating particles ($d=756~{\rm\mu}\text{m}$, ${\it\rho}_{s}=907~\text{kg}~\text{m}^{-3}$) whereas bedforms are usually studied with sedimental materials. A closed loop was used, so that the solid flux could be maintained for an infinite time. The finite size of the tube led to the saturation of the growth of the vortex ripples produced. For the set of parameters studied, the threshold of motion was obtained within a range of laminar to low turbulent flow. The saturated state was studied to characterise it for different flow rates and solid loads. The frequency, wavelength and propagating velocity of ripples were determined using different methodologies based on image analysis and pressure analysis. The frequency and propagating velocity show a clear linear dependence on the initial Shields number, while the wavelength seems to be constant in our experiments.

JFM classification

Complex Fluids: Complex Fluids Geophysical and Geological Flows: Geophysical and Geological Flows Granular media: Granular media Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Multiphase and Particle-laden Flows: Particle/fluid flow Geophysical and Geological Flows: Sediment transport
Type
Papers
Information
Journal of Fluid Mechanics , Volume 765 , 25 February 2015 , pp. 252 - 272
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Copyright
© 2015 Cambridge University Press 

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