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Atomization and Sprays
Factor de Impacto: 1.262 Factor de Impacto de 5 años: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013006728
pages 1053-1075

MECHANISM OF PERFORATION BASED ON SPREADING PROPERTIES OF EMULSIFIED OILS

Emilia Hilz
Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, Wageningen 6703 HB, The Netherlands
A. W. P. Vermeer
Bayer CropScience AG, ES Formulation Technology, Alfred-Nobel-Strasse 50, 40789 Monheim, Germany
M. A. Cohen Stuart
Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, Wageningen 6703 HB, The Netherlands
F.A. M. Leermakers
Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, Wageningen 6703 HB, The Netherlands

SINOPSIS

During an agricultural application, sprays are formed by atomization through a hydraulic nozzle. Fine spray droplets can cause off-target contamination with agrochemicals when they move by air from the application site. Dilute oil-in-water emulsions create coarser sprays than water, when atomized through a flat fan nozzle, and are therefore interesting for drift control purposes. However, different emulsions influence the spray droplet size to a different extent and this effect is not yet well understood. With an aim to develop products with drift reduction properties it is necessary to comprehend the mechanism of interactions between emulsion droplets and the continuous aqueous phase. In this study, we analyze systematically the effects of different physical properties of oils on the spray formation process and investigate how the type of the emulsified oil, the concentration of emulsifier, emulsion droplet size, the spreading properties of the emulsified oil, and its viscosity influence the spray droplet size. Based on the experimental data, we propose a spray formation mechanism of dilute oil-in-water emulsions. We argue that when the liquid sheet leaves the nozzle, some emulsion droplets might merge with the air/water interface of the liquid sheet, spread there and induce a subphase flow, which, reinforced by perturbations in a turbulent flow, will initiate spray atomization. In mixtures of a dilute emulsion and a water soluble surfactant, dynamic surface tension at the interface of the liquid sheet controls the spray formation process. Surfactants located at the interface form a kinetic barrier for the spreading emulsion droplets and thus delay the atomization onset.