Motion model for describing the quantity of air in droplets through changing the structure of air induction nozzle
Keywords:
throat orifice, spray characteristic, model of droplet motion, air induction nozzleAbstract
Air induction nozzles possess good anti-drift performance, the throat and orifice sizes of the nozzles are main design parameters that affecting atomization. Therefore, Venturi tube nozzles and conventional flat fan nozzles were assembled together to investigate the flow rate, droplet size, the quantity of air in droplets affected by single design parameter of nozzles with applying high speed camera and Spraytec laser diffraction system. The results showed that: the flow rate of the air induction nozzle depended only on the throat size of Venturi tube and pressure, and it was proportional to the throat size of Venturi tube at the same pressure; The flat fan nozzle’s orifice size and Venturi tube size significantly affected volume median diameter of droplets, which generally increased after adding surfactant; A new model was established after optimizing classical equation for calculating the percentage of intake air in droplets and studying the effects of throat and orifice size of air induction nozzles on spray characteristics. By variance analysis, it was verified that the new model of quantity of air in droplets produced by all connected nozzles was correct. The calculation showed that the bubbles sizes ranged at 200-900 μm and were in proportion to the droplet size with the percentage of intake air of 10% to 90%. Contrast to the change of volume median diameter and droplet velocity, existence of intake air could influence their change degree to some extent. Keywords: throat orifice, spray characteristic, model of droplet motion, air induction nozzle DOI: 10.25165/j.ijabe.20211405.5513 Citation: Hu J, Liu C X, Wang Z C, Li Y F, Song J L, Liu Y J, et al. Motion model for describing the quantity of air in droplets through changing the structure of air induction nozzle. Int J Agric & Biol Eng, 2021; 14(5): 35–40.References
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[14] Combellack J H, Western N M, Richardson R G. A comparison of the drift potential of a novel twin fluid nozzle with conventional low volume flat fan nozzles when using a range of adjuvants. Crop Protection, 1996; 15(2): 147–152.
[15] Dorr G J, Hewitt A J, Adkins S W, Hanan J, Zhang H, Noller B. A comparison of initial spray characteristics produced by agricultural Nozzles. Crop protection, 2013; 53: 109–117.
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[2] Derksen R C, Zhu H, Fox R D, Brazee R D, Krause C R. Coverage and drift produced by air induction and conventional hydraulic nozzles used for orchard applications. Transactions of the ASABE, 2007; 50(5): 1493–1501.
[3] Peter H S, Lynette B, Christy S, Helmut S, Nader S. Flat fan and air induction nozzles affect soybean herbicide efficacy. Weed Biology and Management, 2008; 8(1): 31–38.
[4] McArtney S J, Obermiller J D. Comparative performance of air-induction and conventional nozzles on an axial fan sprayer in medium density apple orchard. Herb Technology, 2008; 18(3): 365–371.
[5] Andrzej G, Witold B, Paulina M. Spray coverage in potatoes with low drift and air-induction nozzles. Journal of Plant Protection Research, 2005; 45(1): 17–23.
[6] Lv X L, He X K, Song J L, Zeng A J, Andreas H. Analysis of spray process produced by agriculture flat fan nozzles. Transactions of the CSAE, 2007; 16(9): 95–100. (in Chinese)
[7] Miller P C H, Ellis M C B, Tuck C R. Entrained air and droplet velocities produced by agricultural flat fan nozzle. Atomization and Sprays, 1996; 6(6): 693–707.
[8] 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.
[9] Song J L, Liu Y J, Zhang J, He X K, Zeng A J, Andreas H. Drift mechanism of flat fan nozzle. Transactions of the CSAM, 2011; 42(6): 63–69. (in Chinese)
[10] Knewitz H, Weisser P, Koch H. Drift-reducing spray application in orchards and biological efficacy of pesticides. Aspects of Applied Biology, 2002; 66(1): 231–236.
[11] Jones E J, Hanks J E, Wills G D. Effect of different nozzle types on drift and efficacy of roundup ultra. Office of Agricultural Communication, Division of Agriculture, Forestry, and Veterinary Medicine, Mississippi State University, 2002; 53(3): 11–15.
[12] Zhang J, Song J L, He X K, Zeng A J, Liu Y J. Droplets Movement Characteristics in Atomization Process of Flat Fan Nozzle. Transactions of the CSAM, 2011; 42(4): 66–70. (in Chinese)
[13] Zhao H, Song J L, Zeng A J, He X K. Correlations between dynamic surface tension and droplet diameter. Transactions of the CSAM, 2009; 40(8): 74–79. (in Chinese)
[14] Combellack J H, Western N M, Richardson R G. A comparison of the drift potential of a novel twin fluid nozzle with conventional low volume flat fan nozzles when using a range of adjuvants. Crop Protection, 1996; 15(2): 147–152.
[15] Dorr G J, Hewitt A J, Adkins S W, Hanan J, Zhang H, Noller B. A comparison of initial spray characteristics produced by agricultural Nozzles. Crop protection, 2013; 53: 109–117.
[16] Ellis M C B, Swan T, Miller P C H, Waddelow S, Bradley A, Tuck C R. PM—power and machinery: Design factors affecting spray characteristics and drift performance of air induction nozzles. Biosystems Engineering, 2002; 82(3): 289–296.
[17] Liu J J, Zhou X Z. Common discussion of the terminal velocity of the falling raindrops. Physics and Engineering, 2010; 20(5): 17–19. (in Chinese)
[18] Fu X C, Shen W X, Yao T Y, Hou W H. Physical chemistry. Beijing: High Education Press, 2006; 324p.
[19] Wen R Y, Yan S Q, Jiang H, Zhai M L. Basics of chemical engineering. Beijing: The Peking University Publishing House, 2002; 259p.
[20] Tsilingiris P T. Thermophysical and transport properties of humid air at temperature range between 0 and 100ºC. Energy Conversion and Management, 2008; 49(5): 1098–1110.
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Published
2021-10-13
How to Cite
Hu, J., Liu, C., Wang, Z., Li, Y., Song, J., Liu, Y., & Chu, X. (2021). Motion model for describing the quantity of air in droplets through changing the structure of air induction nozzle. International Journal of Agricultural and Biological Engineering, 14(5), 35–40. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5513
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Applied Science, Engineering and Technology
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