Instability regimes in the primary breakup region of planar coflowing sheets
| Autor: | Daniel Fuster, Jean-Philippe Matas, Stéphane Zaleski, Stéphane Popinet, Jérôme Hoepffner, Alain H. Cartellier, Sylvain Marty |
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| Přispěvatelé: | Institut Jean le Rond d'Alembert (DALEMBERT), Université Pierre et Marie Curie - Paris 6 (UPMC)-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 Joseph Fourier - Grenoble 1 (UJF), National Institute of Water and Atmospheric Research [Wellington] (NIWA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Matas, Jean-Philippe |
| Rok vydání: | 2013 |
| Předmět: |
Convection
Materials science Splitter plate Separator (oil production) Thermodynamics [SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] 01 natural sciences Instability [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] 010305 fluids & plasmas Physics::Fluid Dynamics Convective instability 0103 physical sciences [PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] 010306 general physics gas/liquid flows Mechanical Engineering absolute/convective instability Mechanics Vorticity Condensed Matter Physics Breakup aerosols/atomization Mechanics of Materials Dynamic pressure |
| Zdroj: | Journal of Fluid Mechanics Journal of Fluid Mechanics, Cambridge University Press (CUP), 2013, 736, pp.150-176 Journal of Fluid Mechanics, 2013, 736, pp.150-176 HAL |
| ISSN: | 1469-7645 0022-1120 |
| Popis: | This article investigates the appearance of instabilities in two planar coflowing fluid sheets with different densities and viscosities via experiments, numerical simulation and linear stability analysis. At low dynamic pressure ratios a convective instability is shown to appear for which the frequency of the waves in the primary atomization region is influenced by both liquid and gas velocities. For large dynamic pressure ratios an asymptotic regime is obtained in which frequency is solely controlled by gas velocity and the instability becomes absolute. The transition from convective to absolute is shown to be influenced by the velocity defect induced by the presence of the separator plate. We show that in this regime the splitter plate thickness can also affect the nature of the instability if it is larger than the gas vorticity thickness. Computational and experimental results are in agreement with the predictions of a spatio-temporal stability analysis. |
| Databáze: | OpenAIRE |
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