Computational fluid dynamics simulation analysis of the effect of curved rice leaves on the deposition behaviour of droplets

文献类型： 外文期刊

第一作者： Zheng, He

作者： Zheng, He;Sun, Hao;Cao, Yubin;Wang, Chaoxi;Chen, Yunfu;Yu, Hongfeng;Qiu, Wei;Lv, Xiaolan

作者机构：

关键词： Curved surface structures; Rice leaves; Pesticide droplet; Maximum spreading

期刊名称：PLANT METHODS （ 影响因子：5.1； 五年影响因子：6.1 ）

ISSN：

年卷期： 2023 年 19 卷 1 期

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收录情况： SCI

摘要： Background Although previous studies on the droplet deposition behaviour of rice leaves have modelled the leaves as flat surface structures, their curved surface structures actually have a significant effect on droplet deposition. Results In this paper, the statistical distribution of the coordinate parameters of rice leaves at the elongation stage was determined, computational fluid dynamics (CFD) simulation models of droplet impact on rice leaves with different curvature radii were built, and the effect of leaf curvature radius on the deposition behaviour and spreading diameter of droplets on rice leaves was studied using validated simulation models. The results showed that the average relative errors of the CFD simulation models were in the range of 2.23-9.63%. When the droplets struck the rice leaves at a speed of 4 m/s, the 50 mu m droplets did not bounce within the curvature radii of 25-120 cm, the maximum spreading diameters of 200 and 500 mu m droplets that just adhered to the leaves were 287 and 772 mu m, respectively. The maximum spreading diameters of 50, 200, and 500 mu m droplets that just split were 168, 636, and 1411 mu m, respectively. As the curvature radii of the leaves increased, the maximum spreading diameter of the droplets gradually decreased, and droplet bouncing was more likely to occur. However, a special case in which no significant change in the maximum spreading diameter arose when 50 mu m droplets hit a leaf with a curvature radius exceeding 50 cm. Conclusion Splitting generally occurred for large droplets with a small curvature radius and small tilt angle; bouncing generally occurred for large droplets with a large curvature radius and large tilt angle. When the droplet was small, the deposition behaviour was mostly adhesion. The change in spreading diameter after stabilisation was similar to the change in maximum spreading diameter, where the spreading diameter after stabilisation greatly increased after droplet splitting. This paper serves as a reference for the study of pesticide droplet deposition and its application in rice-plant protection.

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