Tamanho de gotas de pontas de pulverização em diferentes condições operacionais por meio da técnica de difração do raio laser

Bueno, Mariana Rodrigues; Cunha, João Paulo Arantes Rodrigues da; Román, R. A. A.

doi:10.1590/s0100-69162013000500009

Cited by 13 publications

(16 citation statements)

References 19 publications

(18 reference statements)

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“…Arvidsson et al (2011) and Bueno et al (2013) also agree with this claim. There is no standard value indicative of risk of drift or safe application; however, values below 15% of droplets with diameter smaller than 100 μm are considered more adequate for environmentally safe applications, with lower risk of drift (Bueno et al, 2013).…”

Section: Resultssupporting

confidence: 62%

“…At the pressure of 200 kPa, a value of 93.98 μm was obtained, which decreased to 68.39 μm when the pressure increased to 500 kPa. This effect of pressure was observed by Bueno et al (2013), working with fan-type hydraulic nozzles (AD IA 110-02 and AD IA 110-04) and by Cunha (2007) for nozzles of the series API 110-02 and 110-04 and for low-drift nozzles of the series ADI 110-02. Likewise, as VPD increased for a certain operating pressure, there was a reduction in this parameter of approximately 0.08 μm per each hPa increase in VPD.…”

Section: Resultsmentioning

confidence: 63%

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Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Sasaki

Teixeira

Fernándes

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TDuring pesticide spraying, the psychrometric conditions of the air may cause evaporation of the droplets along their trajectory from the nozzle to the target. Thus, this study aimed to evaluate the effect of air psychrometric conditions and operating pressure on the droplet spectrum of air-assisted boom sprayers. The test was performed using a prototype equipped with an axial fan, a flow homogenizer, temperature and relative air humidity sensors, a spray nozzle and a gas-heating system to warm up the airflow. With the assembled system and the aid of a particle analyser, the JSF 11002 spray nozzle was evaluated with respect to droplet spectrum in four air psychrometric conditions (7, 14, 21 and 28 hPa) and at four operating pressures (200, 300, 400 and 500 kPa). At the end, evaporation losses were observed during the sprayings. For a given operating pressure and for each increment of 1 hPa in vapor pressure deficit, there was a diameter reduction of approximately 0.0759, 0.518 and 1.514 µm for the parameters DV 0.1 , DV 0.5 and DV 0.9 , respectively. The diameter of the droplets decreased as the operating pressure increased.Espectro de gotas de pulverizadores hidráulicos assistidos a ar sob diferentes condições ambientais e operacionais R E S U M O Durante a aplicação de agrotóxicos as condições psicrométricas do ar podem acarretar a evaporação das gotas no seu trajeto entre a ponta e o alvo. Neste sentido objetivou-se, com este trabalho, avaliar o efeito das condições psicrométricas do ar e a pressão de trabalho no espectro de gotas da pulverização hidráulica com assistência de ar na barra. O ensaio foi realizado empregando-se um protótipo dotado de um ventilador axial, homogeneizador de fluxo, sensores conjugados de temperatura e umidade relativa, ponta hidráulica e sistema de aquecimento do ar a gás. Com o sistema montado e com o auxílio de um analisador de partículas, avaliou-se a ponta hidráulica JSF 110-02 quanto ao espectro de gotas em quatro diferentes condições psicrométricas do ar (7, 14, 21 e 28 hPa) e em quatro pressões de trabalho (200; 300; 400 e 500 kPa). Ao final, observaram-se perdas por evaporação durante as pulverizações. Para a pressão de trabalho a cada incremento de 1 hPa no valor do déficit de pressão, ocorreu redução do diâmetro das gotas na ordem de 0,0759; 0,518 e 1,514 µm para os parâmetros de DV 0,1 , DV 0,5 e DV 0,9 , respectivamente. O diâmetro das gotas reduziu com a elevação da pressão de trabalho.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 63%

Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Sasaki

Teixeira

Fernándes

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…Spraying produces drops of different sizes and, therefore, it is required technical criteria to analyze and quantify comparing droplet sizes produced by other equipment. Thus, many researchers have used the laser diffraction method to study and analyze the droplet spectrum of different equipment (MOTA et al, 2010;CHECHETTO et al 2013;BUENO et al, 2013;OLIVEIRA et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Spray adjuvant characteristics affecting agricultural spraying drift

2015

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This study defined the main adjuvant characteristics that may influence or help to understand drift formation process in the agricultural spraying. It was evaluated 33 aqueous solutions from combinations of various adjuvants and concentrations. Then, drifting was quantified by means of wind tunnel; and variables such as percentage of droplets smaller than 50 μm (V50), 100 μm (V100), diameter of mean volume (DMV), droplet diameter composing 10% of the sprayed volume (DV 0.1 ), viscosity, density and surface tension. Assays were performed in triplicate, using Teejet XR8003 flat fan nozzles at 200 kPa (medium size droplets). Spray solutions were stained with Brilliant Blue Dye at 0.6% (m/ v). DMV, V100, viscosity cause most influence on drift hazardous. Adjuvant characteristics and respective methods of evaluation have applicability in drift risk by agricultural spray adjuvants.KEYWORDS: droplet size, wind tunnel, experimental methods, correlations, multivariate analysis. CARACTERÍSTICAS DOS ADJUVANTES QUE INFLUENCIAM NA DERIVA DE PULVERIZAÇÕES AGRÍCOLASRESUMO: Neste estudo, foram definidas as principais características dos adjuvantes que influenciam e que podem contribuir para compreender o processo de formação de deriva nas pulverizações agrícolas. O experimento avaliou a pulverização de 33 soluções aquosas obtidas das combinações de adjuvantes e concentrações, e quantificou dos mesmos a deriva em túnel de vento e as variáveis denominadas de percentual de gotas menores que 50 µm (V50), percentual de gotas menores que 100 µm (V100), diâmetro mediano volumétrico (DMV), diâmetro de gota tal que 10% do volume do líquido pulverizado é constituído de gotas de tamanho menor que esse valor (DV 0,1 ), viscosidade, densidade e tensão superficial. Os ensaios foram realizados em triplicatas, com pontas de pulverização Tejeet XR8003 VK, pressão de 200 kPa (gotas médias). As soluções pulverizadas foram marcadas com o corante Azul Brilhante a 0,6% (m v -1 ). O DMV, V100 e a viscosidade causam maior influência no potencial risco de deriva. As características avaliadas e suas respectivas metodologias de determinação apresentam aplicabilidade na avaliação de adjuvantes quanto ao potencial risco de deriva. PALAVRAS-CHAVE: tamanho de gotas, túnel de vento, métodos experimentais, correlações, análise multivariada.

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“…This is believed to be due to the fact that fine droplets have a very reduced life expectancy, while the medium droplets suffer less risk of drift and evaporation (Cunha et al, 2014). On the other hand, the air induction twin flat spray nozzles, because they produced larger droplets, can be one of the alternatives adopted to reduce the intensity of the drift phenomenon (Bueno et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Spray Nozzles Performance in Fungicides Applications for Asian Soybean Rust Control

Durão

Boller

2017

Eng. Agríc.

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ABSTRACT:The performance of fungicides in controlling Asian soybean rust depends, in part, the spray quality of these products. The market of components to spray offers new types of nozzles which generate droplets with different characteristics. This study aimed to verify whether applications of fungicides with different spray nozzles interfere in soybean rust control. The experiment was conducted in the 2013/2014 harvest. The experimental design was a randomized block with three replications, and compared ten spray nozzles and a control without fungicide application. The applications were made with a backpack sprayer pressurized with CO2, set to apply a spray volume of 150 L ha -1 . For the determination of severity four plants per plot were sampled, quantifying in each leaflet the number of uredinia cm -2 , which permitted to integrate the area under the disease progress curve (AUDPC). We concluded that HYPRO GUARDIAN ® 120015 Single pre orifice flat spray nozzle, that generates medium size of droplets, provided the lowest AUDPC of soybean rust, as well as the use of fungicide reflected in grain yield, which was on average 288% higher than that obtained by the control without fungicide application.

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Tamanho de gotas de pontas de pulverização em diferentes condições operacionais por meio da técnica de difração do raio laser

Cited by 13 publications

References 19 publications

Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Spray adjuvant characteristics affecting agricultural spraying drift

Spray Nozzles Performance in Fungicides Applications for Asian Soybean Rust Control

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