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Atomization and Sprays
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ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i1.30
pages 41-56

PERFORMANCE CHARACTERISTICS OF EFFERVESCENT ATOMIZER IN DIFFERENT FLOW REGIMES

K. Ramamurthi
Thermodynamics and Combustion Laboratory, Indian Institute of Technology, Madras, Chennai 600036, India
U. K. Sarkar
Thermodynamics and Combustion Laboratory, Indian Institute of Technology, Madras, Chennai 600036, India
B. N. Raghunandan
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India

RÉSUMÉ

The characteristics of the two-phase flow and the spray formed in an effervescent atomizer were experimentally investigated over a range of flow rates, gas-to-liquid ratios (GLR), injection pressures, and discharge orifice diameters. The Reynolds number (Re), defined with the orifice diameter as the characteristic length, was seen to be a pertinent parameter in addition to GLR for determining the transition from the bubbly flow to slug flow. The discharge coefficient of the atomizer in the bubbly flow regime and the Sauter mean diameter of the spray in the annular flow regime were found to scale with the parameter {GLR (Re)0.5}. The structure of the spray and the measured values of cone angle of the spray showed distinctly different features in the bubbly, slug, and annular flow regimes. A two-dimensional simulation of the flow and spray structure reproduced the gross features observed in the experiments.


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