Shear instability of an axisymmetric air–water coaxial jet
| Autor: | Alain H. Cartellier, Antoine Delon, Jean-Philippe Matas |
|---|---|
| Přispěvatelé: | Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Jet (fluid) Shear instability Mechanical Engineering Fluid Dynamics (physics.flu-dyn) Rotational symmetry FOS: Physical sciences Physics - Fluid Dynamics gas/liquid flow Mechanics Condensed Matter Physics 01 natural sciences Instability Measure (mathematics) 010305 fluids & plasmas Surface tension shear layers Convective instability Mechanics of Materials 0103 physical sciences [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] Coaxial Absolute/convective instability 010306 general physics |
| Zdroj: | Journal of Fluid Mechanics Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 843, pp.575-600. ⟨10.1017/jfm.2018.167⟩ |
| ISSN: | 1469-7645 0022-1120 |
| Popis: | International audience; We study the destabilization of a round liquid jet by a fast annular gas stream. We measure the frequency of the shear instability waves for several geometries and air/water velocities. We then carry out a linear stability analysis, and show that there are three competing mechanisms for the destabilization: a convective instability, an absolute instability driven by surface tension, and an absolute instability driven by confinement. We compare the predictions of this analysis with experimental results, and propose scaling laws for wave frequency in each regime. We finally introduce criteria to predict the boundaries between these three regimes. |
| Databáze: | OpenAIRE |
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