Oblique Impact Behavior of Spray Droplets on Tea Tree Leaves Surface

被引：0
|
作者：
Liu D. [1 ,2 ]
Zhou H. [1 ]
Zheng J. [1 ]
Ru Y. [1 ]
机构：
[1] College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing
[2] College of Mechanical and Electronic Engineering, Jinhua Polytechnic, Jinhua
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷 / 05期
关键词：
Droplet; Impact behavior; Rebound prediction model; Spray; Spreading areas; Tea tree leaves;
D O I：
10.6041/j.issn.1000-1298.2019.05.011
中图分类号：
学科分类号：
摘要：
In the spray scene, the tea tree leaves have different tilt directions which are subjected to impact by different directions of spray droplets. In order to grasp the impact behavior and influence mechanism of the droplet impact on the tea tree leaves, the elliptical spreading area was used to measure the spreading variation of the droplet during the oblique impact, and a new type of oblique impact droplet spreading and rebound mathematical prediction model, including blade inclination angle and impact angle was derived. In order to verify the theoretical accuracy, two high-speed cameras were used to test and analyze the impact process and results of spray droplets striking tea leaves.The results showed that the impact angle, initial diameter and impact velocity on the spreading area of the adherent droplets were the impact velocity, initial diameter and impact angle. The initial diameter and impact velocity had a significant effect on the droplet spread area, and were highly positively correlated. For fine and medium droplets, the impact angle had no significant effect on the spreading area; for coarse droplets, the impact angle had a significant effect, and 90° impact angle was recommended. The surface of the tea tree leaves was hydrophilic, and there was no rebound behavior when the water droplets hit the surface of the leaf. The result was consistent with the rebound prediction model. The degree of influence on the droplet splatter was the initial diameter, the impact velocity, and the impact angle. The initial diameter and impact velocity had a significant effect on droplet splatter. The larger the initial diameter and impact velocity of the droplet were, the more likely it was to splash. The impact angle had no significant effect on droplet splatter. Because the surface of tea leaves was relatively smooth, no long fluff, and the surface roughness was small, the splash threshold Kcrit was suitable to be 108.4. © 2019, Chinese Society of Agricultural Machinery. All right reserved.
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页码：96 / 103and195
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