农药雾滴空间运行中的变形特征分析

doi:10.16085/j.issn.1000-6613.2019-2020

摘要/Abstract

摘要：

以化学农药雾滴的空间运行过程为背景，构建了二维气液相界面追踪模型，通过COMSOL Multiphysics系统地研究了雾滴特征参数及风速等多因素耦合下单雾滴在横向风场中下落时的形变特征。结果表明，雾滴的形变会受黏性力、表面张力等内部因素和重力、曳力等外部因素的共同作用，外部作用力能够促进雾滴发生形变，而内部作用力阻碍雾滴的形变。雾滴的形变量随着雾滴尺寸和横向速度的增大而增大，随着动力黏度和表面张力的增大而减小；雾滴下落过程中的形变存在振荡周期，雾滴的形变周期随着雾滴尺寸的增大而增大，随着表面张力的增大而减小，但基本不受横向风速和动力黏度的影响。将雾滴的形变量、形变周期与韦伯数We、奥内佐格数Oh和雷诺数Re等量纲为1数进行拟合，可以预测雾滴的空间形变特性。研究结果对农药雾滴的空间飘移机理及其阻控技术的研发具有重要意义。

关键词: 农药雾滴, 雾滴形变, 界面追踪, 雾滴飘移

Abstract:

A two-dimensional gas-liquid interface tracking model coupled with level-set method is applied to simulate deformation process of chemical pesticide spray droplet. The effects of spray droplet diameter, surface tension, viscosity and air velocity are considered. It shows that spray droplet deformation is the result of comprise and competition between internal forces such as viscous force and surface tension, and external forces such as gravity and drag force. Gravity and drag force can promote droplet deformation, while viscous force and surface tension can hinder droplet deformation. The deformation of spray droplet can oscillate periodically during spatial motion and deformation characteristics of different spray droplets are investigated. The deformation amplitude can be enhanced by increasing spray droplet diameter and air velocity. Besides, it can be weakened by increasing the surface tension and viscosity of spray droplet. The deformation period can be prolonged by increasing droplet diameter and decreasing surface tension, but it is almost unrelated with air velocity and viscosity. Prediction models are proposed by dimensionless analysis to estimate deformation period and amplitude. The results can provide theoretical fundament for the development of spray drift reduction technology.

Key words: pesticide droplet, spray droplet deformation, interface tracking, spray drift

中图分类号:

TQ021.1

马学虎, 薛士东, 孙桐, 奚溪, 宋小沫, 赵峻逸, 兰忠, 郝婷婷. 农药雾滴空间运行中的变形特征分析[J]. 化工进展, 2020, 39(10): 3870-3878.

Xuehu MA, Shidong XUE, Tong SUN, Xi XI, Xiaomo SONG, Junyi ZHAO, Zhong LAN, Tingting HAO. Deformation characteristics of chemical pesticide spray droplet during spatial motion[J]. Chemical Industry and Engineering Progress, 2020, 39(10): 3870-3878.

参考文献

1	OERKE E C. Crop losses to pests[J]. Journal of Agricultural Science, 2006, 144 (1): 31-43.
2	HONG S W, ZHAO L Y, ZHU H P. CFD simulation of pesticide spray from air-assisted sprayers in an apple orchard: tree deposition and off-target losses[J]. Atmospheric Environment, 2018, 175: 109-119.
3	ZWERTVAEGHER I K, VERHAEGHE M, BRUSSELMAN E, et al. The impact and retention of spray droplets on a horizontal hydrophobic surface[J]. Biosystems Engineering, 2014, 126: 82-91.
4	曾爱军. 减少农药雾滴飘移的技术研究[D]. 北京: 中国农业大学, 2005.
4	ZENG A J. Research on technique to reduce spray droplets drift[D]. Beijing: China Agricultural University, 2005.
5	CUNHA J P, CHUECA P, GARCERá C, et al. Risk assessment of pesticide spray drift from citrus applications with air-blast sprayers in Spain[J]. Crop Protection, 2012, 42: 116-123.
6	BUTLER ELLIS M C, LANE A G, O’SULLIVAN C M, et al. Bystander exposure to pesticide spray drift: new data for model development and validation[J]. Biosystems Engineering, 2010, 107(3): 162-168.
7	金涌, 罗志波, 胡山鹰, 等. “第六产业”发展及其化工技术支撑[J]. 化工进展, 2017, 36(4): 1155-1164.
7	JIN Y, LUO Z B, HU S Y, et al. Development of the “Sixth Industry” and its support by chemical technology[J]. Chemical Industry and Engineering Progress, 2017, 36(4): 1155-1164.
8	TORRENT X, GARCERA C, MOLTO E, et al. Comparison between standard and drift reducing nozzles for pesticide application in citrus: Part Ⅰ. Effects on wind tunnel and field spray drift[J]. Crop Protection, 2017, 96: 130-143.
9	GIL Y, SINFORT C. Emission of pesticides to the air during sprayer application: a bibliographic review[J]. Atmospheric Environment, 2005, 39(28): 5183-5193.
10	HILZ E, VERMEER A W P. Spray drift review: the extent to which a formulation can contribute to spray drift reduction[J]. Crop Protection, 2013, 44: 75-83.
11	FELSOT A S, UNSWORTH J B, LINDERS J B H J, et al. Agrochemical spray drift; assessment and mitigation—A review[J]. Journal of Environmental Science and Health, Part B, 2010, 46(1): 1-23.
12	SALYANI M, MILLER D R, FAROOQ M, SWEEB R D. Effects of sprayer operating parameters on airborne drift from citrus air-carrier sprayers[J]. Agricultural Engineering International: CIGR Journal, 2013, 15: 27-36.
13	LE?NIK M, STAJNKO D, VAJS S. Interactions between spray drift and sprayer travel speed in two different apple orchard training systems[J]. International Journal of Environmental Science and Technology, 2015, 12(9): 3017-3028.
14	MILLER D R, STOUGHTON T E, STEINKE W E, et al. Atmospheric stability effects on pesticide drift from an irrigated orchard[J]. Transactions of the ASAE, 2000, 43(5): 1057.
15	邓坤学, 黄启谷. 农药用表面活性剂研究进展[J]. 化工进展, 2009, 28(12): 2199-2204.
15	DENG K X，HUANG Q G. Advances in agrochemical surfactants[J]. Chemical Industry and Engineering Progress, 2009, 28(12): 2199-2204.
16	FRANCA J A L, CUNHA J P, ANTUNIASSI U R. Spectrum, velocity and drift of droplets sprayed by nozzles with and without air induction and mineral oil[J]. Engenharia Agrícola, 2017, 37(3): 502-509.
17	ENDALEW A M, HERTOG M, DELELE M A, et al. CFD modelling and wind tunnel validation of airflow through plant canopies using 3D canopy architecture[J]. International Journal of Heat and Fluid Flow, 2009, 30(2): 356-368.
18	FAROOQ M, BALACHANDAR R, WOLF T. Assessment of an agricultural spray in a none-uniform cross-flow[J]. Transactions of the ASAE, 2001, 44(6): 1455.
19	DORR G J, HEWITT A J, ADKINS S W, et al. A comparison of initial spray characteristics produced by agricultural nozzles[J]. Crop Protection, 2013, 53(Supplement C): 109-117.
20	FERGUSON J C, O'DONNELL C C, CHAUHAN B S, et al. Determining the uniformity and consistency of droplet size across spray drift reducing nozzles in a wind tunnel[J]. Crop Protection, 2015, 76: 1-6.
21	NUYTTENS D, TAYLOR W A, DE SCHAMPHELEIRE M, et al. Influence of nozzle type and size on drift potential by means of different wind tunnel evaluation methods[J]. Biosystems Engineering, 2009, 103(3): 271-280.
22	WOLTERS A, LINNEMANN V, DE ZANDE J C VAN, et al. Field experiment on spray drift: deposition and airborne drift during application to a winter wheat crop[J]. Science of the Total Environment, 2008, 405(1): 269-277.
23	BALSARI P, GIL E, MARUCCO P, et al. Field-crop-sprayer potential drift measured using test bench: effects of boom height and nozzle type[J]. Biosystems Engineering, 2017, 154: 3-13.
24	BUENO M R, CUNHA J P, DE SANTANA D G. Assessment of spray drift from pesticide applications in soybean crops[J]. Biosystems Engineering, 2017, 154: 35-45.
25	SIDAHMED M M, AWADALLA H H, HAIDAR M A. Symmetrical multi-foil shields for reducing spray drift[J]. Biosystems Engineering, 2004, 88(3): 305-312.
26	TSAY J E, OZKAN H E, BRAZEE R, et al. CFD simulation of moving spray shields[J]. Transactions of the ASAE, 2002, 45(1): 21.
27	ZHANG B, TANG Q, CHEN L P, et al. Numerical simulation of spray drift and deposition from a crop spraying aircraft using a CFD approach[J]. Biosystems Engineering, 2018, 166: 184-199.
28	XU L Y, ZHU H P, OZKAN H E, et al. Droplet evaporation and spread on waxy and hairy leaves associated with type and concentration of adjuvants[J]. Pest Management Science, 2011, 67(7): 842-851.
29	ZHOU Z L, CAO C, CAO L D, et al. Research advances of droplet evaporation on different interfaces and the efficiency of pesticide utilization[J]. Chinese Journal of Pesticide Science, 2017, 19(1): 9-17.
30	WANG S J, WANG H J, LI T, et al. Dynamic spreading process of pesticide droplets impacting onto target leaf surfaces[J]. Bangladesh Journal of Botany, 2016, 45(3): 631-640.
31	QUAN S P, SCHMIDT D P. Direct numerical study of a liquid droplet impulsively accelerated by gaseous flow[J]. Physics of Fluids, 2006, 18(10): 102-103.
32	QU Q L, MA P C, LIU P Q, et al. Numerical study of transient deformation and drag characteristics of a decelerating droplet[C]// 45th AIAA Fluid Dynamics Conference, 2015.
33	HOLTERMAN H J. Kinetics and evaporation of water drops in air[M]. Wageningen: IMAG, 2003.
34	NUYTTENS D, BAETENS K, DE SCHAMPHELEIRE M, et al. Effect of nozzle type, size and pressure on spray droplet characteristics[J]. Biosystems Engineering, 2007, 97(3): 333-345.
35	王波, 宋坚利, 曾爱军, 等. 剂型及表面活性剂对农药药液在植物叶片上铺展行为的影响[J]. 农药学学报, 2012 (3): 334-340.
35	WANG B, SONG J L, ZENG A J, et al. Effects of formulations and surfactants on the behavior of pesticide liquid spreading in the plant leaves[J]. Chinese Journal of Pesticide Science, 2012 (3): 334-340.
36	张文君. 农药雾滴雾化与在玉米植株上的沉积特性研究[D]. 北京: 中国农业大学, 2014.
36	ZHANG W J. The study of pesticide droplets atomization and deposition characteristics in corn leaves[D]. Beijing: China Agricultural University, 2014.
37	杨威, 贾明, 孙凯, 等. 液滴在连续气流作用下的变形与破碎[J]. 内燃机学报, 2018, 36(3): 230-236.
37	YANG W, JIA M, SUN K, et al. Droplet deformation and breakup in a continuous gas flow[J]. Transactions of CSICE, 2018, 36(3): 230-236.

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