The effect of oil-in-water emulsion pesticide on the evolution of liquid sheet rim disintegration and the spraying distribution

Yang, Wanting; Zhong, Wei; Jia, Weidong; Ou, Mingxiong; Dong, Xiang; Zhang, Tie; Ding, Suming; Yu, Pengpeng

doi:10.1016/j.cropro.2023.106547

Cited by 1 publication

(1 citation statement)

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“…These additives can help reduce the surface tension of the droplets and promote droplet spreading [25,26]. Essentially, it has been reported that emulsion facilitates the rupture of the spray liquid film, and the pesticide drift is prevented with increased droplet size [27][28][29][30]. Therefore, it is necessary to study the effect of emulsions on the deposition of hollow droplets.…”

Section: Introductionmentioning

confidence: 99%

Deposition of Water and Emulsion Hollow Droplets on Hydrophilic and Hydrophobic Surfaces

Gong,

Jia,

Kang

2024

Agriculture

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The deposition of spray droplets is a hot topic in the field of plant protection. The air-induction nozzle, which is commonly used in agricultural spray, can produce droplets containing bubbles. However, few studies have addressed the deposition of hollow droplets. In the present study, we used experimental and numerical methods to investigate the deposition of hollow droplets. Three kinds of liquid—water, oil-based emulsion and organosilicon—were used to produce hollow droplets, and the diameter of droplets varied from 3 to 4.5 mm. Both hydrophilic and hydrophobic surfaces were selected as deposition targets. The results show that the deposition of hollow droplets can generate a central jet, which is similar to the Wortington jet. High deposition velocity and the large bubble volume were responsible for the large attainable height of the central jet. On the hydrophilic surface, for water hollow droplets with Weber number (We) ranging from 350 to 391, the central jet began to break up as the bubble fraction of the hollow droplet reached 0.15. Based on the numerical results, it was found that the internal pressure difference between the bottom liquid and the air cavity leads to the formation of the central jet. The bubble volume and impact velocity were both positively correlated with the internal pressure difference. The oil-based emulsion promoted the adherence of the hollow droplet by lubricating the hydrophobic surface. The oil-based emulsion hollow droplets shifted from rebounding to adhering on the hydrophobic surface as the emulsion concentration reached 0.4%.

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