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Droplet spectrum at different vapour pressure deficits1 Rev. Ciênc. Agron.
Maciel,Christiam Felipe Silva; Teixeira,Mauri Martins; Fernandes,Haroldo Carlos; Zolnier,Sérgio; Cecon,Paulo Roberto.
ABSTRACT An efficient pesticides spraying depends a lot in psychrometric conditions, mainly if it is using fine droplets, once climatic conditions may cause droplets evaporation and consequent financial loss to the farmer. Thus, the aim of this work was to determine the droplet spectrum depending on the vapour pressure deficits. The work was carried out inside of a climate chamber to obtain the vapour pressure deficits (VPDair). The laser particle analyzer, model Spraytech, was used to determine the droplet spectrum, and the experiment was conducted in factorial scheme 5 x 20, consisted of five working pressures (100; 200; 300; 400 and 500 kPa) and twenty VPDair (2.3; 3.2; 4.2; 5.6; 7.0; 7.4; 9.5; 11.7; 12.7; 15.8; 16.4; 16.9; 21.2; 22.1; 22.2; 28.1; 29.7;...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Droplets diameter; Droplets evaporation; Hydraulic spraying; Spraying technology.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100041
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Droplet spectrum of a spray nozzle under different weather conditions Rev. Ciênc. Agron.
Maciel,Christiam Felipe Silva; Teixeira,Mauri Martins; Fernandes,Haroldo Carlos; Zolnier,Sérgio; Cecon,Paulo Roberto.
ABSTRACT The application of pesticides is always susceptible to losses through evaporation and drift of the spray droplets. With these losses, a smaller amount of pesticide reaches the target, possibly impairing the efficiency of phytosanitary control. Due to these concerns, the aim of this study was to evaluate the interference of weather conditions in the droplet spectrum produced by hydraulic spraying. To carry out the work, it was necessary to build an experimental system. This consisted of a laser particle-size analyser, hydraulic nozzle (Jacto JSF 11002), stationary sprayer, gas heater, wind tunnel, climate chamber (with the aim of maintaining the internal psychrometry similar to that of the air exiting the wind tunnel), collector, and temperature...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spraying losses; Droplet drift; Droplet evaporation; Hydraulic spraying; Laser particle-size analyser.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300430
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Spray volume distribution pattern and droplet size spectrum from ceramic nozzles AGRIAMBI
Massola,Mateus P.; Holtz,Vandoir; Martins,Marcos P. de O.; Umbelino,Anderson da S.; Reis,Elton F. dos.
ABSTRACT Droplet size spectrum and uniformity of spray volume distribution are important parameters for selecting spray nozzles. The objective of this study was to evaluate the average spray volume distribution and droplet size spectrum from ceramic nozzles. The spray volume distribution pattern was evaluated on a test table for hydraulic spray nozzles using spray heights of 0.4, 0.5, 0.6, 0.7, and 0.8 m, and working pressures of 500, 600, and 700 kPa. Computer simulations were used to analyze the spray volume distribution using arrangements of bar heights, working pressures, and spacing between spray nozzles in a bar of 12 m. The droplet size spectrum from the spray nozzles was evaluated using a randomized complete experimental design in a 2 × 3...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Homogeneous distribution; Volume median diameter; Hydraulic spraying.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100804
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