Simulation and experimental research on droplet flow characteristics and deposition in airflow field
Keywords:
droplet flow, droplet density, air-blast sprayer, computational fluid dynamics, droplet depositionAbstract
In order to study the motion law of droplet flow under the airflow action of long-range air-blast sprayers, a CFD-based 3D model was established for the air-blast sprayer duct and its external airflow field, and the discrete phase model was introduced to simulate the motion of droplet flow in the airflow. The simulation data of the droplet flow trajectory, droplet flow parameters and droplet deposition were obtained by establishing the monitoring sections and bilateral coupling calculation in the airflow field. Results showed that gravity had an obvious effect on droplets and large droplets settled faster. Some of the larger droplets were formed by polymerization in droplets motion. The smaller droplets were transported further along with the airflow, and the long-range sprayer has a significant effect on the directional transport of small droplets. Besides, the spraying swath in the direction perpendicular to the range enlarged gradually with the increase of the spraying range. At the end of the range, the diffuse and drifting of the droplets were dominant. Given that the outlet airflow velocity of the sprayer duct was 25.01 m/s and the spray pressure 1.8 MPa, the maximum motion distances of aerosol, mist, fine mist and coarse mist in the airflow field were 18.5 m, 19.5 m, 17.5 m and 10.5 m, respectively. Droplet size and number as well as number density and volume density of droplet flow on all monitoring sections showed a regression function with changes in the distance of the spraying range. The simulation results of the model adopted in this paper were verified by Chi-square test between the simulation results of the droplet deposition and the spray measurement results. Research results provide a new method for the study of orchard air-blast spraying technology and references for the optimization of spraying technology. Keywords: droplet flow, droplet density, air-blast sprayer, computational fluid dynamics, droplet deposition DOI: 10.25165/j.ijabe.20201306.5455 Citation: 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.References
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[2] Dai F F. Brief introduction to development trend of pesticide application technology in China. Plant Protection, 2004; 30(4): 5–8. (in Chinese)
[3] He X K. Improving severe draggling actuality of plant protection machinery and its application techniques. Transactions of the CSAE, 2004; 20(1): 13–15. (in Chinese)
[4] Liu J. The study about appliance and technology of cannon rotary-atomizing long-shot air-assisted spraying. Master dissertation. Yangling: Northwest A&F University, 2004; 65p. (in Chinese)
[5] Guo F, Chen J D, Guo H, Han C J, Cheng J C, Yang W Z. Performance optimization and advance of 3WF-8 air-assisted orchard sprayer. Journal of Agricultural Mechanization Research, 2010; 32(11): 48–56. (in Chinese)
[6] 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)
[7] Ding T H, Cao S M, Xue X Y, Ding S M, Zhou L F, Qiao B Y. Simulation and experiment on single-channel and double-channel airflow field of orchard sprayer. Transactions of the CSAE, 2016; 32(14): 62–68. (in Chinese)
[8] Fu Z T, Wang J, Qi L J, Wang H T. CFD simulation and experimental verification of air-velocity distribution of air assisted orchard sprayer. Transactions of the CSAE, 2009; 25(1): 69–74. (in Chinese)
[9] 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)
[10] 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)
[11] 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)
[12] 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)
[13] Chen F Y, Wang X C, Ding W M, Fu X M, Lv X L, He G M. Numerical simulation and experimental verification of 3D air-velocity field of disk fan used in orchard sprayer. Transactions of the CSAM, 2010; 41(8): 51–54. (in Chinese)
[14] Endalew M A, Debaer C, Rutten N, Vercammen J, Delele M A, Ramon H, et al. A new integrated CFD modeling approach towards air-assisted orchard spraying. Part I: Model development and effect of wind speed and direction on sprayer airflow. Comput. Electron. Agric., 2010; 71(2): 128–136.
[15] Delele M A, De Moor A, Sonck B, Ramon H, Nicolai B M, Verboven P. Modelling and validation of the air flow generated by a cross flow air sprayer as affected by travel speed and fan speed. Biosystems Engineering, 2005; 92(2): 165–174.
[16] Dekeyser D, Foque D, Duga A T, Verboven P, Hendrickx N, Nuyttens D. Spray deposition assessment using different application techniques in artificial orchard trees. Crop Protection, 2014; 64: 187–197.
[17] Qi L J, Zhao Y Q, Wang J, Ji R H, Mang L. CFD simulation and experimental verification of droplet dispersion of air-assisted orchard prayer. Transactions of the CSAM, 2010; 41(2): 62–67. (in Chinese)
[18] Cui Z H, Fu Z T, Qi L J, Wang J. Effect of the air duct medication on the spray drift emitted by an air-assisted sprayer. Transactions of the CSAE, 2008; 24(2): 111–115. (in Chinese)
[19] Wang J X, Qi L J, Xia Q J. CFD simulation and validation of trajectory and deposition behavior of droplets around target affected by air flow field in greenhouse. Transactions of the CSAE, 2015; 31(11): 46–53. (in Chinese)
[20] Lv X L, Fu X M, Song J L, He X K. Influence of spray operating parameters on spray drift. Transactions of the CSAM, 2011; 42(1): 59–63. (in Chinese)
[21] Lv X L, Fu X M, Wu P, Ding S M, Zhou L F, Yan H J. Influence of spray operating parameters on droplet deposition. Transactions of the CSAM, 2011; 42(6): 70–75. (in Chinese)
[22] He X K, Zeng A J, He J. Effect of wind velocity from orchard sprayer on droplet deposit and distribution. Transactions of the CSAE, 2002; 18(4): 75–77. (in Chinese)
[23] Delele M A, Jaeken P, Debaer C, Baetens K, Endalew M A, Ramon H, et al. CFD prototyping of an air-assisted orchard sprayer aimed at drift reduction. Comput. Electron. Agric., 2007; 55(1): 16–27.
[24] Salyani M. Optimization of deposition efficiency for air-blast sprayers. Transactions of the ASAE, 2000; 43(2): 247–253.
[25] Larbi P A, Salyani M. Model to predict spray deposition in citrus air-blast sprayer applications: part 1. Spray dispersion. Transactions of the ASABE, 2012; 55(1): 29–39.
[26] Ramon S, Ariane V, Rafael G, Cruz G, Enrique M, Patricia C. Eulerian-Lagrangian model of the behaviour of droplets produced by an air-assisted sprayer in a citrus orchard. Biosystems Engineering, 2017; 154: 76–91.
[27] Zhu H J. Fluent 15.0 practical guidelines for flow field analysis. Posts and Telecommunications Press, 2015; 503p. (in Chinese)
[28] Tang J P. Fluent 14.0 super study guide. Posts and Telecommunications Press, 2013; 460p. (in Chinese)
[29] Song S R. Optimization research on air-blast sprayer duct and spraying effect. Guangzhou: South China Agricultural University, 2012. (in Chinese)
[30] Liu H B. The car flow field CFD simulation and analysis of aerodynamic characteristics. Master dissertation. Lanzhou: Lanzhou University of Technology, 2013; 68p. (in Chinese)
[31] Duan Z Z. Flow field analysis and project examples of ANSYS Fluent. Beijing: Publishing House of Electronics Industry, 2015; 439p. (in Chinese)
[32] ANSYS Fluent. 14.5 user’s guide. Canonsburg, PA: ANSYS, 2012.
[33] 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
2020-12-03
How to Cite
Xiahou, B., Sun, D., Song, S., Xue, X., & Dai, Q. (2020). Simulation and experimental research on droplet flow characteristics and deposition in airflow field. International Journal of Agricultural and Biological Engineering, 13(6), 16–24. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5455
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Applied Science, Engineering and Technology
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