Abstract
The study on the deposition efficiency of pesticide droplets on soybean leaves can provide the basis for reducing pesticide quantity and increasing pesticide efficiency during the application of soybean plant protection machinery. The movement behavior of droplet impinges on the plant leaf surface is affected by many factors, among which the most important and the easiest to adjust are spray droplet size and impingement velocity. By changing the droplet size and impact velocity and using Fluent simulation software, the pesticide droplet hitting the soybean leaf surface was simulated and a test platform was established to verify the simulation results. The conclusions are as follows: The longitudinal roughness of soybean leaves is higher than the transverse roughness, the longitudinal pressure of soybean leaves is higher than the transverse pressure during the impact process, and the velocity of droplet spreading along the longitudinal is lower than that of spreading along the transverse; although soybean leaf surface has high adhesion, droplet losses still exist when droplet impact velocity is relatively high. The maximum spreading diameter of the droplet increases first and then decreases with the increase of impact velocity. At the same time, the maximum spreading diameter of droplet increases with the increase of particle size. The droplet deposition was best at 1.34 m/s impact velocity and 985 μm particle size. This conclusion can provide optimal operation parameters for soybean plant protection operation which can be used to guide soybean plant protection operation, improve control effect, reduce quantity and increase efficiency. Keywords: soybean, deposition efficiency, Fluent, droplet impact, spreading features, dynamic DOI: 10.25165/j.ijabe.20211403.6274 Citation: Li H, Niu X X, Ding L, Tahir A S, Guo C L, Chai J J, et al. Dynamic spreading characteristics of droplet impinging soybean leaves. Int J Agric & Biol Eng, 2021; 14(3): 32–45.
Highlights
IntroductionAffected by many factors, such as physical and chemical parameters like the surface tension of droplet, viscosity, density, particle size, tilt angle, the speed at which the droplet impinges on the blade surface; biological properties like the roughness of the blade surface, contact angle, wetting ability; environmental factors like site temperature and humidity, wind speed
The effective use of pesticides can influence control effect, reduce cost, protect the ecological environment and improve crop quality
When the particle size was less than 985 μm, the droplets bounced off the blade surface; when the particle size was greater than or equal to 985 μm, it was difficult for the droplet to bounce off the sample blade due to the increase of spreading area and blade surface adhesion
Summary
Affected by many factors, such as physical and chemical parameters like the surface tension of droplet, viscosity, density, particle size, tilt angle, the speed at which the droplet impinges on the blade surface; biological properties like the roughness of the blade surface, contact angle, wetting ability; environmental factors like site temperature and humidity, wind speed. Nairn et al.[8] found the basic principle of leaf blade with hairy structure, which will help improve its spray effectiveness; Maher et al.[9] studied drop impact and coupling dynamic of blade surface deposition formation using high-speed imaging technology, and developed a physical model to predict the energy dissipation of droplets, it provided an important theoretical basis for the effective improvement of pesticide utilization. Xie et al.[12] studied the spreading process of the droplet (high-efficiency cypermethrin emulsion) hitting the leaf surface of the wolfberry, the results showed that the final spreading coefficient of the droplet was affected by droplet size, the impact speed, angle of blade tilt, and so on. It provides the basic theoretical basis for improving the deposition efficiency of droplet spreading on the blade surface, reducing the amount and increasing the efficiency
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