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Atomization and Sprays
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ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i2.30
pages 157-190

EXPERIMENTS ON AIR-BLAST ATOMIZATION OF VISCOELASTIC LIQUIDS, PART 1: QUIESCENT CONDITIONS

Larry Li
Daniel M. Dressler
Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, British Columbia, V6T1Z4, Canada
Sheldon I. Green
Department of Mechanical Engineering, University of British Columbia, 3321−2260 West Mall, Vancouver, British Columbia, V6T1Z4, Canada
Martin H. Davy
Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, British Columbia, V6T1Z4, Canada
Donald T. Eadie
Kelsan Technologies Corporation, 1140 West 15th Street, North Vancouver, British Columbia, V7P 1M9, Canada

要約

Motivated by the need to improve spray coating, an experimental investigation into viscoelastic atomization using preformulated model test liquids is presented. These test liquids had similar values of surface tension, density, and rate-independent shear viscosity, but varying extensional viscosity. Through the use of these test liquids, the effects of elasticity were systematically isolated and found to act against the breakup of a spray issuing from a plain-jet air-blast atomizer. Flash photography revealed large-scale filamentary structures at breakup, which delayed discrete droplet formation until farther downstream, where relative air-liquid velocities were reduced. The lower relative velocities near breakup produced an increase in the volumetric median diameter, as was confirmed by analysis of high-magnification shadowgraphs. The hindering influence of elasticity on atomization was further substantiated through particle image velocimetry measurements, which indicated that the elastic droplets, owing to their greater inertia, were better able to maintain their initial momentum.


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