Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
MECHANISM OF PERFORATION BASED ON SPREADING PROPERTIES OF EMULSIFIED OILS
RÉSUMÉ
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.
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Cryer Steven A., Altieri Anthony L., Role of large inhomogeneities in initiating liquid sheet breakup in agricultural atomisation, Biosystems Engineering, 163, 2017. Crossref
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Wu Zhao-Wei, Zhao Hui, Li Wei-Feng, Xu Jian-Liang, Wang Sheng, Liu Hai-Feng, Effects of inner bubble on liquid jet breakup, Physics of Fluids, 31, 3, 2019. Crossref
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Dempsey Logan P., Gelardo Nicholas S., The Impact of Oil Viscosity on the Performance of Emulsion-Based Drift Reduction Agents, in Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture, 2019. Crossref
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Néel B., Lhuissier H., Villermaux E., ‘Fines’ from the collision of liquid rims, Journal of Fluid Mechanics, 893, 2020. Crossref
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Villermaux Emmanuel, Fragmentation versus Cohesion, Journal of Fluid Mechanics, 898, 2020. Crossref
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Gong Chen, Kang Can, Jia Weidong, Yang Wanting, Wang Yuli, The effect of spray structure of oil-based emulsion spray on the droplet characteristics, Biosystems Engineering, 198, 2020. Crossref
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Vernay Clara, Ramos Laurence, Würger Alois, Ligoure Christian, Playing with Emulsion Formulation to Control the Perforation of a Freely Expanding Liquid Sheet, Langmuir, 33, 14, 2017. Crossref
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Gong Chen, Li Dongyang, Kang Can, Wang Yuli, Visualisation of the evolution of perforations in oil-based emulsion sheets formed by flat-fan spray nozzles, Biosystems Engineering, 207, 2021. Crossref
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Zhang Xiaoguang, Xiong Lixia, Effect of adjuvants on the spray droplet size of pesticide dilute emulsion, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 619, 2021. Crossref
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Li Cheng, He Ruichen, He Zilong, Kumar S. Santosh, Fredericks Steven A., Hogan Christopher J., Hong Jiarong, Spatially-resolved characterization of oil-in-water emulsion sprays, International Journal of Multiphase Flow, 145, 2021. Crossref
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Makhnenko Iaroslav, Alonzi Elizabeth R., Fredericks Steven A., Colby Christine M., Dutcher Cari S., A review of liquid sheet breakup: Perspectives from agricultural sprays, Journal of Aerosol Science, 157, 2021. Crossref
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Yang Wanting, Jia Weidong, Ou Mingxiong, Zhong Wei, Jiang Li, Wang Xiaowen, Effect of Physical Properties of an Emulsion Pesticide on the Atomisation Process and the Spatial Distribution of Droplet Size, Agriculture, 12, 7, 2022. Crossref
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Gong Chen, Li Dongyang, Kang Can, Visualization of the evolution of bubbles in the spray sheet discharged from the air‐induction nozzle, Pest Management Science, 78, 5, 2022. Crossref
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Krishnan Gautham, Cryer Steven A., Turner Jason E., Sasi Rajan Nikhil, Spray atomisation in multiphase flows with reference to tank mixes of agricultural products, Biosystems Engineering, 223, 2022. Crossref