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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2015013630
pages 827-851

DROP IMPACT EXPERIMENT AS A MODEL EXPERIMENT TO INVESTIGATE THE ROLE OF OIL-IN-WATER EMULSIONS IN CONTROLLING THE DROP SIZE DISTRIBUTION OF AN AGRICULTURAL SPRAY

Clara Vernay
Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS/Universite de Montpellier, F-34095 Montpellier Cedex 05, France
Laurence Ramos
Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS/Universite de Montpellier, F-34095 Montpellier Cedex 05, France
Jean-Paul Douzals
IRSTEA, UMR ITAP, Montpellier, France
Rajesh Goyal
R&I Novecare, Solvay, Bristol, Pennsylvania, USA
Jean-Christophe Castaing
R&I Novecare, Solvay, Aubervilliers, France
Christian Ligoure
Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS/Universite de Montpellier, F-34095 Montpellier Cedex 05, France

SINOPSIS

Agricultural spraying involves atomizing a liquid stream through a hydraulic nozzle, thus forming a liquid sheet that is subsequently destabilized into drops. Standard adjuvants such as dilute oil-in-water emulsions are known to influence the spray drop size distribution. Although being documented, the physical mechanisms at the origin of the size increase remain unclear. To elucidate the mechanisms causing the changes on the drop size distribution, we investigate the influence of dilute emulsions on the destabilization mechanisms of liquid sheets. Model laboratory experiments based on the collision of a liquid tear on a small solid target are used to produce and characterize liquid sheets. With dilute oil-in-water emulsions, the liquid sheet is destabilized during its expansion by the nucleation of holes that perforate the sheet and grow. The emulsion concentration and the size of the oil droplet of the emulsion are varied to rationalize their influence on the sheet destabilization mechanisms. The results obtained with the model laboratory experiments are compared to the measurement of the drop size distribution resulting from a conventional agricultural spray. The very good correlation between the number of perforation events and the volume fraction of small drops in the spray suggests (i) that the model experiment on liquid sheet is appropriate to investigate and gain an understanding of the physical mechanisms governing the spray drop size distribution and (ii) that the perforation destabilization mechanism of liquid sheets, which dominates for dilute emulsions, is at the origin of the increase of the size of the spray drops.


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