Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction

doi:10.1016/j.cjche.2023.10.001

Chinese Journal of Chemical Engineering ›› 2024, Vol. 66 ›› Issue (2): 250-262.DOI: 10.1016/j.cjche.2023.10.001

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Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction

Shidong Xue^1,2, Jingkun Han^1,3, Xi Xi⁴, Zhong Lan¹, Rongfu Wen¹, Xuehu Ma¹

1. State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 16024, China;
2. School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong 999077, China;
3. China Tianchen Engineering Corporation, Tianjin 300400, China;
4. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Received:2023-06-10 Revised:2023-10-07 Online:2024-04-20 Published:2024-02-28
Contact: Xuehu Ma,E-mail:xuehuma@dlut.edu.cn
Supported by:
This work was financially supported by the National Key Research and Development Program of China (2017YFD0200304).

Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction

Shidong Xue^1,2, Jingkun Han^1,3, Xi Xi⁴, Zhong Lan¹, Rongfu Wen¹, Xuehu Ma¹

1. State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 16024, China;
2. School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong 999077, China;
3. China Tianchen Engineering Corporation, Tianjin 300400, China;
4. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

通讯作者: Xuehu Ma,E-mail:xuehuma@dlut.edu.cn
基金资助:
This work was financially supported by the National Key Research and Development Program of China (2017YFD0200304).

Abstract

Abstract: Pesticide adjuvants, as crop protection products, have been widely used to reduce drift loss and improve utilization efficiency by regulating droplet spectrum. However, the coordinated regulation mechanisms of adjuvants and nozzles on droplet spectrum remain unclear. Here, we established the relationship between droplet spectrum evolution and liquid atomization by investigating the typical characteristics of droplet diameter distribution near the nozzle. Based on this, the regulation mechanisms of distinctive pesticide adjuvants on droplet spectrum were clarified, and the corresponding drift reduction performances were quantitively evaluated by wind tunnel experiments. It shows that the droplet diameter firstly shifts to the smaller due to the liquid sheet breakup and then prefers to increase caused by droplet interactions. Reducing the surface tension of sprayed liquid facilitates the uniform liquid breakup and increasing the viscosity inhibits the liquid deformation, which prolong the atomization process and effectively improve the droplet spectrum. As a result, the drift losses of flat-fan and hollow cone nozzles are reduced by about 50 % after adding organosilicon and vegetable oil adjuvants. By contrast, the air induction nozzle shows a superior anti-drift ability, regardless of distinctive adjuvants. Our findings provide insights into rational adjuvant design and nozzle selection in the field application.

Key words: Pesticide drift, Spray droplets, Particle size distribution, Spray atomization, Transport processes, Adjuvants

摘要： Pesticide adjuvants, as crop protection products, have been widely used to reduce drift loss and improve utilization efficiency by regulating droplet spectrum. However, the coordinated regulation mechanisms of adjuvants and nozzles on droplet spectrum remain unclear. Here, we established the relationship between droplet spectrum evolution and liquid atomization by investigating the typical characteristics of droplet diameter distribution near the nozzle. Based on this, the regulation mechanisms of distinctive pesticide adjuvants on droplet spectrum were clarified, and the corresponding drift reduction performances were quantitively evaluated by wind tunnel experiments. It shows that the droplet diameter firstly shifts to the smaller due to the liquid sheet breakup and then prefers to increase caused by droplet interactions. Reducing the surface tension of sprayed liquid facilitates the uniform liquid breakup and increasing the viscosity inhibits the liquid deformation, which prolong the atomization process and effectively improve the droplet spectrum. As a result, the drift losses of flat-fan and hollow cone nozzles are reduced by about 50 % after adding organosilicon and vegetable oil adjuvants. By contrast, the air induction nozzle shows a superior anti-drift ability, regardless of distinctive adjuvants. Our findings provide insights into rational adjuvant design and nozzle selection in the field application.

关键词: Pesticide drift, Spray droplets, Particle size distribution, Spray atomization, Transport processes, Adjuvants

Shidong Xue, Jingkun Han, Xi Xi, Zhong Lan, Rongfu Wen, Xuehu Ma. Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction[J]. Chinese Journal of Chemical Engineering, 2024, 66(2): 250-262.

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Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction

Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction

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