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| OLIVEIRA,RONE B. DE; ANTUNIASSI,ULISSES R.; GANDOLFO,MARCO A.. |
| 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 (DV0.1), 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.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Droplet size; Wind tunnel; Experimental methods; Correlations; Multivariate analysis. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000100109 |
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| Aubin, Nicolas; Augier, Benoit; Sacher, Matthieu; Bot, Patrick; Hauville, Frédéric; Flay, Richard G.j.. |
| An experiment was performed in the Yacht Research Unit’s Twisted Flow Wind Tunnel (University of Auckland) to test the effect of dynamic trimming on three IMOCA 60 inspired mainsail models in an upwind (βAW = 60°) unheeled configuration. This study presents dynamic fluid structureinteractionresultsinwellcontrolledconditions(wind,sheetlength)withadynamictrimming system. Trimming oscillations are done around an optimum value of CFobj previously found with a static trim. Different oscillation amplitudes and frequencies of trimming are investigated. Measurements are done with a 6 component force balance and a load sensor giving access to the unsteady mainsail sheet load. The driving CFx and optimization target CFobj coefficient first decrease at low reduced... |
| Tipo: Text |
Palavras-chave: Wind tunnel; Upwind; Unsteady; Fluid-structure interaction. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00597/70919/69157.pdf |
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| Alves,Guilherme Sousa; Kruger,Greg Robert; Cunha,João Paulo Arantes Rodrigues da. |
| Abstract: The objective of this work was to evaluate the spray drift and droplet spectrum of dicamba applied alone or with potential drift-reducing adjuvants, using air-induction flat fan nozzles. Standard (XR and TT) and air-induction (AIXR and TTI) nozzles were evaluated in a wind tunnel. The adjuvants used were polymer, ammonium sulfate, vegetable oil, and phosphatidylcholine. The applications were conducted at 276 kPa pressure and 3.5 m s-1 wind speed. The droplet spectrum was measured using a laser diffraction system. Round strings were used as drift collectors, positioned perpendicularly to the wind direction, at 2, 3, 4, 5, 6, 7, and 12 m from the nozzle. Drift was calculated by quantifying, through fluorimetry, a fluorescent tracer added to each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air-induction nozzle; Droplet size; Herbicide drift; Nozzle type; Wind tunnel. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600693 |
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| Godinho Jr.,João D.; C. Vieira,Lucas; A.A. Ruas,Renato; Carvalho Filho,Alberto; R. Faria,Vinícius; I.V.G. God,Pedro. |
| Abstract Background: The study of the interactions between equipment, application methods, and spray mixtures is fundamental to optimize the application of pesticides. The determination of the best combination of these factors can reduce the drift during the application of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). Objective: The objective this paper is to study the influence of nozzle models, working pressures, and surfactant adjuvant in reducing the drift of 2,4-D. Methods: The spectrum of nozzle drops was determined for a conventional flat jet; flat jet with air induction; double plane jet with air induction; deflector flat jet with air induction; and an empty cone with air induction at pressures of 200, 300, 400, and 500 kPa. This was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural mechanization; Application technology; Quality control; Air induction; Droplet size; Wind tunnel. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100320 |
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| Moraes,Eder D. de; Saab,Otávio J. G. A.; Gandolfo,Marco A.; Marubayashi,Rodrigo Y. P.; Gandolfo,Ulisses D.. |
| ABSTRACT Pest, disease and weed control in large-scale crops depend on the application of agrochemicals. These applications are subject to several factors that can lead to drift. The objective of this study was to evaluate the effect of spray nozzles with inclined flat jet, on the drift. The drift was collected in a 10 m wind tunnel, with a spray system inside. The samples were collected in 5 horizontal points, from 2.0 to 6.0 m away from the spray nozzle and 5 points in the vertical, from 0.1 to 0.5 m away from the lower base of the wind tunnel, totaling 25 sample points. The mixture applied was glyphosate (isopropylamine salt, 1080 g a.e. ha-1) with 2,4-D (dimethylamine salt, 1.005 g a.e. ha-1). The nozzles J3D 100 025, JGC 120 02, JAP 110 015 and ADI... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wind tunnel; Environmental contamination; Phytosanitary control; J3D. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300229 |
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| Alheidary, Majid Hazim. |
| Spray drift is defined as the movement of small spray droplets as particles or vapour at the time of application or soon thereafter out of the target zone by the action of air or incorrect nozzle mounted on boom. Several factors are known to affect spray drift with significant differences such as physical parameters, technological parameters, and meteorological parameters. The mitigation of spray drift from agricultural application is an important issue that concerns many researchers and authors working with field tests. Wind tunnel technique is considered as an alternative method to assess spray drift that move away from the target site intended under different settings as boom heights and wind speeds. In 2015, IRSTEA Montpellier wind tunnel was fitted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drift ratio; Wind tunnel; Nozzle type; Wind speed. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5665 |
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| Azizpanah, Amir; Rajabipour, Ali; Alimardani, Reza; Kheiralipour, Kamran; Ghamari, Bahram; Mohammadi, Vahid. |
| Spray drift study for reducing environmental hazards and protecting crops is of high importance as the pesticides used today are more active and many are non-selective. Drift potential can be restricted by assessing and optimizing equipment design, application parameters, the liquid spray properties, type of formulation and environmental conditions. The aim of this research was to design, construct and assess an intelligent system to determine the level of the spraying drift. The main parts of the system were liquid supply mechanism, pipes and nozzles, a controlled pneumatic system to pressurize the liquid, a nozzle moving system with a controlling panel and a tunnel for wind providing and control. To assess the performance of sprayer and drift of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sprayer; Wind tunnel; Drift; Volumetric mean diameter.. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3308 |
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| Korese, Joseph Kudadam; Hensel, Oliver. |
| The purpose of the study was to evaluate the performance of bulk charcoal pad configuration, experimentally. For this, a number of experiments have been conducted in a wind tunnel in order to evaluate the pressure drop, cooling efficiency and specific water consumption as a function of air velocity, water flow rate and pad configuration. The test were carried out at six levels of air velocity (0.12, 0.51, 0.82, 1.05, 1.10 and 1.14 m s-1), three water flow rates (2.2, 3.2 and 5.2 l min-1) and three pad configurations: single layer pad (SLP), double layer pad (DLP) and triple layer pad (TLP) made out of small and large size charcoal particle of equivalent diameter 30 mm and 50 mm respectively. It was found that pressure drop range of small size charcoal pads... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Charcoal; Pad configuration; Wind tunnel; Evaporative cooling; Pressure drop; Cooling efficiency; Specific water consumption. |
| Ano: 2016 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3841 |
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