Research on the critical impact velocity of droplets impacting metal grid and breaking into sub-droplets

Zhenyu Yang; Zhen Li; Xin Ai; Xufeng Xu; Nengchao Li; Xiuyun Xue

doi:10.1117/12.2611321

14 October 2021 Research on the critical impact velocity of droplets impacting metal grid and breaking into sub-droplets

Zhenyu Yang, Zhen Li, Xin Ai, Xufeng Xu, Nengchao Li, Xiuyun Xue

Author Affiliations +

Proceedings Volume 11930, International Conference on Mechanical Engineering, Measurement Control, and Instrumentation; 119302H (2021) https://doi.org/10.1117/12.2611321
Event: International Conference on Mechanical Engineering, Measurement Control, and Instrumentation (MEMCI 2021), 2021, Guangzhou, China

Abstract

Pesticide drift occurs in the process of pesticide spraying by UAV (Unmanned Aerial Vehicle) and other plant protection machinery. This study proposed a grid atomization method to deal with pesticide drift. First, large droplets that are not easy to drift are sprayed by spray machinery, and then large droplets impact on a metal grid placed above target and break into small droplets suitable for attachment to target, thereby achieving the purpose of reducing pesticide drift and increasing pesticide deposition rate. In order to better realize the breaking of large droplets into small droplets in agriculture, this study researched the influence of different grid materials and grid specifications on critical impacting velocity of large droplets breaking into smaller droplets after impacting it on grid. This study used a high-speed camera to photograph the process of droplets being fragmented into smaller droplets. The size of droplet and impact speed are obtained by image analysis. The experiment results show that there is no obvious difference between the effect of the three materials of stainless steel, nickel and copper on critical impacting velocity under the same grid specifications; Under the experiment conditions, critical impact velocity increases with the increase of mesh number.

Citation Download Citation

Zhenyu Yang, Zhen Li, Xin Ai, Xufeng Xu, Nengchao Li, and Xiuyun Xue "Research on the critical impact velocity of droplets impacting metal grid and breaking into sub-droplets", Proc. SPIE 11930, International Conference on Mechanical Engineering, Measurement Control, and Instrumentation, 119302H (14 October 2021); https://doi.org/10.1117/12.2611321

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