Experimental study of bedforms obtained with floating particles in a pipe flow
| Autor: | Francine Fayolle, C. Josset, C. Castelain, D. Edelin |
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| Přispěvatelé: | Laboratoire de thermocinétique [Nantes] (LTN), Centre National de la Recherche Scientifique (CNRS)-Université de Nantes (UN), LUNAM Université [Nantes Angers Le Mans], Laboratoire de génie des procédés - environnement - agroalimentaire (GEPEA), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL), ONIRIS, Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Bedform
Materials science Turbulence Mechanical Engineering Laminar flow Mechanics Condensed Matter Physics Shields parameter Pipe flow Vortex Volumetric flow rate [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] [SPI]Engineering Sciences [physics] Mechanics of Materials [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Two-phase flow ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Fluid Mechanics Journal of Fluid Mechanics, Cambridge University Press (CUP), 2015 HAL |
| ISSN: | 0022-1120 1469-7645 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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