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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.v7.i3.30
pages 267-294

MODELING OF MULTIPLE VAPORIZING DROPLET STREAMS IN CLOSE SPACING CONFIGURATIONS

Jun Xin
Department of Mechanical Engineering, The University of Illinois at Chicago, Chicago, Illinois USA
Constantine M. Megaridis
Department of Mechanical Engineering, The University of Illinois at Chicago, Chicago, Illinois 60607, USA

RÉSUMÉ

A model of convective droplet evaporation dynamics is presented for droplet-array configurations that feature close spacing. Comparisons with available experimental data on single and multiple ethanol droplet streams show good agreement. Evidence is presented that evaporative cooling of ethanol micro droplets is not negligible at room temperature. It is shown that local vapor accumulation in the wake of the leading droplets plays an important role in depressing the evaporation rates of the trailing droplets. The influence of ambient blowing in a direction perpendicular to the path of droplet propagation is shown to be important for the trailing droplets in situations where the evaporative flux and the cross-stream convective flux carrying the fuel vapor away are of comparable magnitude. Model predictions for a densely arranged, ordered spray system at elevated temperature and pressure suggest that in most cases the droplets approach one another, and there exist substantial differences in evaporation characteristics between the core and the periphery of the spray. Initial droplet spacings of the order of a few droplet diameters are found to cause vapor spatial distributions which suggest that if ignition occurred, droplets would burn in groups more likely.


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