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Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v11.i2.30
16 pages

LINEAR INSTABILITY ANALYSIS OF THE VISCOUS LONGITUDINAL PERTURBATION ON AN AIR-BLASTED LIQUID SHEET

Felix Barreras
Laboratorio de Investigación en Fluidodinámica y Tecnologías de la Combustión (LIFTEC), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de Zaragoza, Zaragoza, Spain
Antonio Lozano
Laboratorio de Investigación en Fluidodinámica y Tecnologías de la Combustión (LIFTEC), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de Zaragoza, Zaragoza, Spain
Cesar Dopazo
CIEMAT, Av. Complutense 22 Madrid, 28040 Spain

RÉSUMÉ

This article describes the evolution of sinusoidal waves propagating on a water sheet surrounded by two high-velocity co-flowing air streams. The analysis is based on linear instability theory and includes viscosity in both gas and liquid perturbations, while for the stationary velocity profiles the flows have been treated as inviscid. To discern the role of the gas dynamics, air and water velocities have been varied independently. Flow conditions have been selected to compare the numerical predictions with experimental measurements of oscillation frequencies, wavelengths, and growth rates. The dispersion diagrams show a broad viscosity-enhanced zone, a consequence of considering viscosity in the gas perturbation.


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