Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

França, Jorge Alfredo Luiz; Cunha, João Paulo Arantes Rodrigues da; Antuniassi, Ulisses Rocha

doi:10.1590/1809-4430-eng.agric.v38n2p232-237/2018

Cited by 11 publications

(9 citation statements)

References 14 publications

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“…The increase in pressure increases the kinetic energy of the droplets, resulting in increased velocity. Higher velocities cause the droplets to traverse the path between the droplet launch and the target in less time, contributing to the reduction of drift (França et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Performance of Air Induction Spray Nozzle Models Under Different Operating Conditions

et al. 2020

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For the successful application of phytosanitary products, it is essential to understand the spraying process well. The present work aims to evaluate the spectrum and speed of the droplets produced by different spray nozzle models with air induction, working under different operating conditions. The experiment was conducted using an entirely randomized design with five repetitions in a 3 × 3 × 3 factor scheme that incorporates three nozzle models (ADIA, AIXR, and GA), three nominal flows (0.76, 1.14, and 1.51 L min-1), and three operating pressures (200, 300, and 400 kPa). The spectrum and speed of the droplets were determined directly using a real-time droplet analyzer based on highresolution image analysis. The spray nozzle model interfered with the results. The ADIA promoted Dv0.5 (VMD) higher than AIXR and GA, reaching differences of up to 90%. The increase in pressure promoted a reduction in the droplet size; however, there was no well-defined behavior for the relationship between the flow rate and droplet size. The ADIA and AIXR gave rise to greater uniformity of the droplets in most of the evaluated conditions. The increase in pressure promoted an increase in the speed of the droplets. However, the effect of the nozzle model on this parameter was dependent on the flow.

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Section: Resultsmentioning

confidence: 99%

Performance of Air Induction Spray Nozzle Models Under Different Operating Conditions

et al. 2020

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“…As médias de diâmetro de gotas foram superiores a 100 µm, representando uma aplicação realizada com segurança ambiental, pois o risco de deriva é menor quando se pulveriza com gotas acima desse valor. França et al (2018), avaliando pontas com indução de ar, em diferentes condições de pressão de trabalho, observaram diferença no diâmetro da mediana volumétrica quando a pressão de trabalho das pontas foi aumentada; quanto maior a pressão empregada, menor o diâmetro observado. O mesmo foi constatado no volume de calda de 400 L ha -1 , pois foi necessária a elevação da pressão de trabalho da ponta TVI-800075, dentro da faixa de operação recomendada pelo fabricante (155-517 kPa), ocorrendo redução do diâmetro de gotas.…”

Section: Resultsunclassified

Parâmetros técnicos da tecnologia de aplicação aplicados à pulverização hidropneumática em diferentes condições operacionais

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Alvarenga

Rinaldi

et al. 2019

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Parâmetros técnicos da tecnologia de aplicação usados na pulverização hidropneumática em diferentes condições operacionais Technical parameters of the application technology applied to hydropneumatic spraying in different operating conditions RESUMO: O Brasil é o maior produtor e exportador mundial de café e vem enfrentando dificuldades em razão da suscetibilidade da cultura à ocorrência de insetos. Objetivou-se, com este trabalho, avaliar parâmetros da aplicação utilizando a pulverização hidropneumática com o uso de diferentes volumes de calda e pontas de pulverização, na presença e ausência de adjuvante agrícola. O trabalho foi conduzido em área experimental no município de Monte Carmelo (MG), com a avaliação da eficiência de aplicação hidropneumática com diferentes volumes de calda, 200 L ha-1 e 400 L ha-1 , duas pontas de pulverização jato cônico vazio (JA-01 e TVI-800075), presença/ausência de adjuvante agrícola na calda de aplicação, Cloridrato de Cartape na dose de 500 g i.a ha-1 , e Cartape + óleo de laranja, na dose de 75 mL 100 L-1 de calda. O uso do óleo de laranja interferiu na aplicação, alterando a densidade de gotas e amplitude relativa. O uso de gotas grossas é uma alternativa viável para a eficiência da aplicação em época de baixa umidade relativa do ar. O maior volume de calda aumentou a percentagem de cobertura e densidade de gotas no alvo.

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“…Besides using assisted boom sprayer systems, the deposition and coverage of the leaf surface by sprayed chemicals can be maximized by adjusting other factors, such as: the spectrum of the droplets (Silva et al, 2014, Weber et al, 2017França et al, 2018), spray pressure (Cunha et al, 2016), spray nozzle type (Cunha et al, 2014;Madureira et al, 2015;Cunha et al, 2016, Durão & Boller, 2017, adding adjuvants to the spray (Cunha et al, 2014;Madureira et al, 2015;Oliveira et al, 2016), and changing the volume of the mixture (Cunha et al, 2014;Prado et al, 2015;Weber et al, 2017;Roehrig et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Deposition and Coverage of Soybean Leaf Surfaces by Sprays Applied Using Different Assisted Boom Sprayer Systems

et al. 2019

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Maintaining homogeneity in the distribution of fungicidal sprays applied throughout the plant, minimizing the variation between the upper and lower third of the plant, is one of the main challenges for application technologies with regard to soybean crops. To increase the deposition and leaf coverage of sprayed compounds, especially in the middle and lower thirds of the plant, we developed and tested alternative assisted boom sprayer systems. In this study, three assisted boom sprayer systems (Vortex ® , Dropleg ® , and chain curtain) were evaluated, in addition to the conventional system, in terms of the deposition and coverage of the leaf surface they achieved in the upper, middle, and lower thirds of plants using the fluorescent tracer Helios SC 500™. The assisted boom sprayer systems allowed the sprayed mixture to be better distributed throughout the plant. With the conventional spray system (without assitance), the deposition in the upper third was approximately 26 times higher than that in the lower third, whereas with the use of the assisted boom sprayer systems, the difference in deposition between these thirds was 11 times higher. Among the evaluated systems, the Dropleg ® system presented the lowest depositional variation, which was only 5.5 times higher in the upper than in the lower third, because of the increased deposition achieved in the lower third of the plant. Leaf coverage varied from 41% to 81% in the upper third, from 24% to 43% in the middle third, and from 4% to 13% in the lower third of the plant. Using the conventional spray system, the leaf surface coverage was approximately 13 times higher in the upper third than in the lower third of the plant, whereas with the use of the assisted boom sprayer systems, especially the Dropleg ® system, this variation was reduced by 73%, and the coverage of the upper and lower thirds only differed by 3.5 times. Indeed, the Dropleg ® system reached a leaf coverage of close to 13% in the lower third of the plant. The use of assisted boom sprayer systems improved the distribution of the mixture applied throughout the plant, reducing the differences among the thirds of the plant both in the levels of deposition and coverage of the leaf surfaces. The Dropleg ® system increased the deposition and leaf coverage in the lower third of the plant the most, facilitating better distribution of the mixture.

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Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

Cited by 11 publications

References 14 publications

Performance of Air Induction Spray Nozzle Models Under Different Operating Conditions

Performance of Air Induction Spray Nozzle Models Under Different Operating Conditions

Parâmetros técnicos da tecnologia de aplicação aplicados à pulverização hidropneumática em diferentes condições operacionais

Deposition and Coverage of Soybean Leaf Surfaces by Sprays Applied Using Different Assisted Boom Sprayer Systems

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