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Characterizing Droplet Retention in Fruit Tree Canopies for Air-Assisted Spraying

Author

Listed:
  • Jun Li

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China
    Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China)

  • Mingxin He

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Huajun Cui

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Peiyi Lin

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Yingyi Chen

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Guangxin Ling

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Guangwen Huang

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Han Fu

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China
    Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China)

Abstract

As a mainstream spraying technology, air-assisted spraying can increase the penetration and droplet deposition in the tree canopy; however, there seems to be less research on the maximum deposition volume of leaves. In this paper, the maximum deposition volume of a single leaf and the attenuation characteristics of droplets in the canopy were studied. By coupling them, the prediction equation of the total canopy droplet retention volume was obtained. The single-leaf test results showed that too small a surface tension reduced the total volume of droplet deposition on the leaf. In this paper, when the Weber number was equal to 144.3, the deposition form changed from particles to a water film, yielding the best deposition effect. The canopy droplet penetration test results show that the air velocity at the outlet increased first and then decreased, and the best effect was achieved when the air velocity at the outlet was 10 m/s. At the same time, when the surface tension of pesticides was 50 mN/m, the effect of canopy droplet deposition was better, which was consistent with the results of the single-leaf test. An average relative error of prediction equation of the total canopy droplet retention volume with 15.6% was established.

Suggested Citation

  • Jun Li & Mingxin He & Huajun Cui & Peiyi Lin & Yingyi Chen & Guangxin Ling & Guangwen Huang & Han Fu, 2022. "Characterizing Droplet Retention in Fruit Tree Canopies for Air-Assisted Spraying," Agriculture, MDPI, vol. 12(8), pages 1-19, July.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:8:p:1093-:d:871932
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    References listed on IDEAS

    as
    1. James C. Bird & Rajeev Dhiman & Hyuk-Min Kwon & Kripa K. Varanasi, 2013. "Reducing the contact time of a bouncing drop," Nature, Nature, vol. 503(7476), pages 385-388, November.
    2. Maher Damak & Md Nasim Hyder & Kripa K. Varanasi, 2016. "Enhancing droplet deposition through in-situ precipitation," Nature Communications, Nature, vol. 7(1), pages 1-9, November.
    Full references (including those not matched with items on IDEAS)

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