年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
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
要約
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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Penfield Kevin, Dempsey Logan, Wall Jason, Sun Susan, The Role of Interfacial Rheology in Agricultural Drift Control, in Pesticide Formulation and Delivery Systems: 38th Volume, Innovative Application, Formulation, and Adjuvant Technologies, 2016. Crossref
-
Blanken Nathan, Saleem Muhammad Saeed, Thoraval Marie-Jean, Antonini Carlo, Impact of compound drops: a perspective, Current Opinion in Colloid & Interface Science, 51, 2021. Crossref
-
Piskunov M., Semyonova A., Khomutov N., Ashikhmin A., Yanovsky V., Effect of rheology and interfacial tension on spreading of emulsion drops impacting a solid surface, Physics of Fluids, 33, 8, 2021. Crossref
-
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
-
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
-
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
-
Blanken Nathan, Saleem Muhammad Saeed, Antonini Carlo, Thoraval Marie-Jean, Rebound of self-lubricating compound drops, Science Advances, 6, 11, 2020. Crossref
-
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
-
Patil Nagesh D., Shaikh Javed, Sharma Atul, Bhardwaj Rajneesh, Droplet impact dynamics over a range of capillary numbers and surface wettability: Assessment of moving contact line models and energy budget analysis, Physics of Fluids, 34, 5, 2022. Crossref
-
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