Response of droplet parameters to liquid viscosity in the flow field of an air-blast sprayer
Keywords:
air-blast sprayer, computational fluid dynamics, droplet diameter, droplet density, viscosityAbstract
The physical properties of sprayed droplets such as viscosity affect their deposition on the target. In order to understand the response characteristics of droplet parameters to the viscosity of a spray solution, a three-dimensional model of the external flow field of an air-blast sprayer based on computational fluid dynamics (CFD) was established according to the actual spray range and the sprayer duct structure. The change rules of droplet diameter and droplet density with distance under different viscosities of the spray solution in the flow field were obtained through numerical solution of the CFD model. The reliability of the model was verified by a chi-squared test comparing the numerical calculations with the results of field experiments. The results showed that the change rule of droplet parameters in an airflow field under different values of the spray solution viscosity was consistent. With the increase in the axial distance, the droplet size decreased initially, then increased, and finally decreased, while the droplet density gradually decreased. Moreover, the greater the spray solution viscosity, the shorter the conveying distance of the droplets in the axial direction, although viscosity was helpful in reducing the droplet drift. In addition, at the same axis distance, with the increased viscosity of the spray solution, the droplet size increased, and the sedimentation of the droplets was more rapid, while the density of the droplets decreased. The results provided a new framework for the study of air-blast spraying technology and serve as a reference for the optimization of the sprayer structure and the preparation method for spray solutions. Keywords: air-blast sprayer, computational fluid dynamics, droplet diameter, droplet density, viscosity DOI: 10.25165/j.ijabe.20231605.7380 Citation: Zhou X E, Xiahou B, Zhang L, Sun D Z, Xue X Y, Dai Q F, et al. Response of droplet parameters to liquid viscosity in the flow field of an air-blast sprayer. Int J Agric & Biol Eng, 2023; 16(5): 28-34References
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[2] Chen J R, Song S R, Sun D Z, Hong T X, Zhang L. Test on airflow field and spray characteristics for long-range air-blast sprayer. Transactions of the CSAE, 2017; 33(24): 72-79. (in Chinese)
[3] Osterman A, Godeša T, Hočevar M, Širok B, Stopar M. Real-time positioning algorithm for variable-geometry air-assisted orchard sprayer. Computers and Electronics in Agriculture, 2013; 98: 175-182.
[4] Xie S H, Chen B Q, Lai C P, Zeng F L, Lai X H. Application of long-range air-blast sprayer in pest control of hilly orange orchard in South Jiangxi Province. South China Fruits, 2016; 45(1): 33-34+38. (in Chinese)
[5] Xu Y M, Zhu X W, Liu Z J, Hu Y H, Gu F. Field simulation and structure optimization of the air conveying system in air assisted sprayer based on computer fluid dynamics. Journal of Zhejiang University (Agric. & Life Sci.), 2018; 44(04): 451-458. (in Chinese)
[6] Fan G J, Wang Y Z, Zhang L, Yang Q L, Zhang X H, Wang Y. Design and experiment of caterpillar air-assisted orchard sprayer. Journal of Agricultural Mechanization Research, 2018; 40(5): 117-120. (in Chinese)
[7] Qu F, Sheng X Y, Li X, Zhang J X, Li W, Liu J Y. Improved Design of 3WZF-400A Orchard Air-assisted Sprayer. Transactions of the CSAM, 2017; 48(S1): 15-21. (in Chinese)
[8] Song S R, Xia H B, Lu Y H, Hong T S, Ruan Y C. Structural optimization and experiment on fluid director of air-assisted sprayer. Transactions of the CSAE, 2012; 28(6): 7–12. (in Chinese)
[9] Song S R, Xia H B, Liu H S, Hong T S, Sun D Z, Lu Y H. Numerical simulation and experiment of structural optimization for air blast sprayer. Transactions of the CSAM, 2013; 44(6): 73–78, 55. (in Chinese)
[10] Song S R, Ruan Y C, Hong T S, Dai Q F, Xiahou B. Optimal design and test on expanding duct of wide-swath air-blast sprayer. Transactions of the CSAE, 2013; 29(18): 34–42. (in Chinese)
[11] Song S R, Hong T S, Liu H S, Ruan Y C, Chen J Z. Law of spatial airflow velocity distribution for wide-swath air-blast sprayer. Transactions of the CSAE, 2013; 29(24): 17–24. (in Chinese)
[12] Liu Q, Fu Z T, Qi L J, Shi J X, Chen F. Characteristics optimization experiments of 9WZCD-25 air-blast and ultra-low volume sprayer. Transactions of the CSAM, 2005; 36(9): 44–47. (in Chinese)
[13] Li J, Zhao C Q, Li S J, Chen H, Ding S F. Droplet deposition characteristics of CFD based orchard air-driven sprayer. Journal of Huazhong Agricultural University, 2019; 38(6): 7. (in Chinese)
[14] Bian Y L, Li J P, Xue C L, Wang P F, Li X H. Analysis on status quo and prospects of intelligent development of air-feed sprayer in orchard. Journal of Northeast Agricultural University, 2019; 51(2): 86-94. (in Chinese)
[15] Xiahou B, Sun D Z, Song S R, Xue X Y, Dai Q F. Simulation and experimental research on droplet flow characteristics and deposition in airflow field. Int J Agric & Biol Eng, 2020; 13(6): 16–24. doi: 10.25165/j.ijabe.20201306.5455.
[16] Kira O, Dubowski Y, Linker R. In-situ open path FTIR measurements of the vertical profile of spray drift from air-assisted sprayer. Biosystems Engineering, 2018; 169:32-41.
[17] Song S R, Chen J Z, Hong T S, Xue X Y, Xiahou B, Song Y, Variation of droplet diameter in wind field for long range air-assisted sprayer. Transactions of the CSAE, 2017; 33(6): 59-66. (in Chinese)
[18] Xiahou B, Song S R, Sun D Z, Chen J Z, Dai Q F, Xue X Y. Effect of spraying pressure on droplet diameter of long-range and wide-swath air-blast sprayers. Journal of Henan Agricultural Sciences, 2019; 48(2): 7. (in Chineser)
[19] Pergher G, Gubiani R, Cividino S R S, Dell’Antonia D, Lagazio, C. Assessment of spray deposition and recycling rate in the vineyard from a new type of air-assisted tunnel sprayer. Crop Protection, 2013; 45: 6-14.
[20] Endalew A M, Debaer C, Rutten N, Vercammen, J, Delele M A, Ramon H, et al. Modelling pesticide flow and deposition from air-assisted orchard spraying in orchards: A new integrated CFD approach. Agricultural and Forest Meteorology, 2010; 150(10): 1383-1392.
[21] Nuyttens D, Baetens K, Schampheleire M D, Sonck B. Effect of nozzle type, size and pressure on spray droplet characteristics. Biosystems Engineering, 2007; 97(3): 333-345.
[22] Baetens K, Nuyttens D, Verboven P, Schampheleire M D, Nicolaï B, Ramon H. Predicting drift from field spraying by means of a 3D computational fluid dynamics model. Computers and Electronics in Agriculture, 2007; 56(2):161-173.
[23] Panneton B, Lacasse B. Effect of air-assistance configuration on spray recovery and target coverage for a vineyard sprayer. Canadian Biosystems Engineering, 2004; 46(7): 213-218.
[24] Gu C C, Liu Z J, Pan G T, Pu Y J, Yang F Z. Optimization of working parameters for 3MGY-200 axial air-assisted sprayer in kiwifruit orchards. Int J Agric & Biol Eng, 2020; 13(2): 81-91.
[25] Salcedo R, Garcera C, Granell R, Molto E, Chueca P. Description of the airflow produced by an air-assisted sprayer during pesticide applications to citrus. Spanish Journal of Agricultural Research, 2015; 13(2): e0208.
[26] Salcedo R, Granell R, Palau G, Vallet A, Garcerá C, Chueca P, Moltó E. Design and validation of a 2D CFD model of the airflow produced by an air blast sprayer during pesticide treatments of citrus, Computers and Electronics in Agriculture, 2015; 116: 150-161.
[27] Grella M, Gil E, Balsari P, Marucco P, Gallart M. Advances in developing a new test method to assess spray drift potential from air blast sprayers. Spanish Journal of Agricultural Research, 2017; 15(3): e0207.
[28] Li L L, Zhang R R, Chen L P, Yi T C, Xu G, Xue D X, et al. Development of sensor system for real-time measurement of droplet deposition of agricultural sprayers. Int J Agric & Biol Eng, 2021; 14(5): 19-26. doi: 10.25165/j.ijabe.20211405.5528.
[29] Zhu H J. Fluent 15.0 practical guidelines for flow field analysis. Posts and Telecommunications Press, 2015; 290p. (in Chinese)
[30] ANSYS Fluent. 14.0 theory guide. Canonsburg, PA: ANSYS, 2011.
[31] Zhang M Y, Jing S R, Li G J. Fluid dynamics of higher engineering. Higher Education Press, 2012; 532p. (in Chinese)
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Published
2023-12-29
How to Cite
Zhou, X., Xiahou, B., Zhang, L., Sun, D., Xue, X., Dai, Q., & Song, S. (2023). Response of droplet parameters to liquid viscosity in the flow field of an air-blast sprayer. International Journal of Agricultural and Biological Engineering, 16(5), 28–34. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/7380
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