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Atomization and Sprays
Facteur d'impact: 1.189 Facteur d'impact sur 5 ans: 1.596 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.v19.i1.20
pages 19-39

NEWTONIAN AND NON-NEWTONIAN SPRAY INTERACTION WITH A HIGH-SPEED MOVING SURFACE

Daniel M. Dressler
Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, British Columbia, V6T1Z4, Canada
Larry Li
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

RÉSUMÉ

Motivated by the need to improve spray coating transfer efficiencies, results are presented from an experimental investigation into the interaction between an air-blast spray and a high-speed moving surface. Three model elastic liquids of varying polymer molecular weight and three inelastic liquids of varying shear viscosity were used to isolate the effect of elasticity and shear viscosity, respectively, on spray impaction behavior. In addition, an industrial liquid friction modifier, KELTRACKTM , for use in the railroad industry, was included in the spray tests. High-speed photography was used to examine spray impingement. Ligaments, formed as a consequence of a liquid's viscoelasticity, were observed impacting the surface for the higher molecular weight elastic liquids. The effect of increasing elasticity was shown to increase spray coating transfer efficiencies; this is attributed to a larger proportion of the sprayed liquid reaching the target surface as well as an increased splash threshold on impact. Observations and recommendations were stated regarding transfer efficiency improvement considerations.


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