Plausibility of variable coverage high range spraying: Experimental studies of an externally air-assisted electrostatic nozzle

Patel, M.; Sahoo, Hemant Kumar; Nayak, Manoj K.; Ghanshyam, C.

doi:10.1016/j.compag.2016.07.021

Cited by 17 publications

(13 citation statements)

References 27 publications

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“…The experiment was conducted by injecting charges to a prototype nozzle in aerial electrostatic spraying and compared the spraying performance with conventional spraying. Electrostatics application in crop protection has witnessed many developments in optimizing the system parameters worthy of recommendation [46,47] .…”

Section: Electrostatic Spraying Application Of Pesticidesmentioning

confidence: 99%

“…A 15 mm charging electrode distance from the nozzle tip has been found to produce high charging quantity than 10 mm [23] . Electroplating copper with nickel material in an electrode design for electrostatic spraying was found to be suitable to enhance the effectiveness of spray when optimally positioned at a distance between 2.0-3.0 mm from the nozzle aperture [47] . A 1.6 mm electrode distance resulted in a reduction of charge-mass ratio up to 13%-18% [37,38] .…”

Section: Nozzle Type and Electrode Materialsmentioning

confidence: 99%

“…Application of voltages to electrode material in nozzle aperture categorically increases spray droplets chargeability to a limit but further increase in applied voltage stabilizes or decreases spray droplets chargeability [47] . High voltage supply to the electrode above threshold capacity has no significant effect on maximizing droplets charge, hence the need to inject current within the recommended level.…”

Section: Applied Voltage Pressure and Flow Ratementioning

confidence: 99%

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Review of electrostatic system parameters, charged droplets characteristics and substrate impact behavior from pesticides spraying

Appah

Wang

et al. 2019

International Journal of Agricultural and Biological Engineering

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Electrostatic spraying application is adopted in crop protection to prevent pest infestation, to improve product quality and to maximize yield. It involves a superposition of charges to pesticide spray droplets to attract substrate ions at obscured surfaces. The droplets wraparound effect reduces off-target deposition, enhances on-target spray and invariably improves spray efficiency. Electrostatic spraying system works effectively at optimum parameters in combination with charging voltages, application pressures, spraying height regimes, flow rate, travel speed, electrode material, and nozzle orientation. Many combinations of the system parameter settings have been systematically used by researchers for the electrostatic application, but there are unknown specific optimum parameters combinations for pesticide spraying. Since droplets chargeability influences the effectiveness of electrostatic spraying system, the parameters that produce ideal charge to mass ratio determine the functionality of the spraying deposition, retention and surface coverage. This article, therefore, analyses electrostatic system parameters that produce suitably charged droplets characteristics for effective impacting behavior of pesticides on substrates. Increasing applied voltages consequently maximizes charge-mass ratio to optimum and starts declining upon further increase in voltages beyond a critical point. This review further proposes the selection of an optimum electrostatic parameters combination that yields optimum droplets chargeability in pesticide application. Also, it is necessary to investigate the charge property of substrates prior to pesticide application in order to superpose the right opposite charge on spray droplets at rupture time during electrostatic spraying system.

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Section: Electrostatic Spraying Application Of Pesticidesmentioning

confidence: 99%

Section: Nozzle Type and Electrode Materialsmentioning

confidence: 99%

Section: Applied Voltage Pressure and Flow Ratementioning

confidence: 99%

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Review of electrostatic system parameters, charged droplets characteristics and substrate impact behavior from pesticides spraying

Appah

Wang

et al. 2019

International Journal of Agricultural and Biological Engineering

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“…Both coaxial (Aliseda et al, 2008;Eggers and Villermaux, 2008;Lasheras et al, 1998;Marmottant and Villermaux, 2004) and electrostatic (Cloupeau and Prunet-Foch, 1994;Gañán-Calvo et al, 2018;Grace and Marijnissen, 1994;Kien Nguyen et al, 2014;Manna et al, 2017;Rosell-Llompart et al, 2018;Verdoold et al, 2014) atomizers have been the subject of intensive study in the last few decades. More recently, there has been increasing efforts to develop hybrid atomizers that include gas flow forcing as well as an electrostatic component (Fei et al, 2017;Kourmatzis et al, 2012;Li et al, 2014;Patel et al, 2017Patel et al, , 2016Seong et al, 2017). These studies have revealed a wide range of atomization regimes that can be attainable with a rather simple atomizer geometry.…”

Section: Introductionmentioning

confidence: 99%

Feedback Control of the Spray Liquid Distribution of Electrostatically Assisted Coaxial Atomization

et al. 2020

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Electrostatic actuation is used for real-time multiphysics feedback control of two-fluid coaxial atomization. This actuation is added to the modulation of the axial and angular momentum of the turbulent coaxial gas stream, for a total of three actuators to control atomization. We characterize the spray real-time response through optical scattering measurements of radial liquid distribution. We apply principal component analysis on the scattering radial profiles and correlate the first three principal components to the three control inputs. The control algorithm continuously adjusts the three inputs to minimize the difference between a goal radial profile representing the desired spray state and the profile observed in real time. This real-time multiphysics (gas momentum plus electrostatic repulsion) control on the liquid distribution in a two-fluid coaxial spray is a novel contribution to the archival literature on this technology.

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“…The electrostatic sprayer is a system that electrically charges the finely divided particulate matter inductively [1][2][3][4][5]. To use the technology efficiently, it is very important to optimize the parameters of the spray nozzle.…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling and Experimental Evaluation of the Effects of Electrode Geometry and Deposition Target on Electrostatic Spraying Processes

Patel¹,

Sharma²,

Nayak³

et al. 2015

IJCA

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Electrostatic force field application is one of the most promising methods for spraying protective liquid sprays onto the biological surfaces of crops, orchards, vineyards and trees, because electrostatic space charge and image deposition forces enhance the uniformity of spray on the target surface and increases the transfer efficiency, mass transfer and adhesion. The study has been carried out to know the effects of electrode geometry, deposition target and spray cloud through computational modeling using COMSOL Multiphysics. In this work, four different shaped targets, four different geometry of electrodes and four stages of spray cloud are analyzed to know the effects of resultant electric field to charge the conductive liquid sprays. Comparative study of electric field among all the four shaped targets resulted that elliptical target has the maximum resultant electric field followed by conical, spherical and cylindrical target respectively. Similarly in case of electrode geometry, electric field of square electrode with circular cross-section found to be optimum followed by circular electrode with circular cross-section, circular electrode with square cross section and square electrode with square cross section respectively. The experimental results are in good agreement with computational modeling of charging the liquid sprays.

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Plausibility of variable coverage high range spraying: Experimental studies of an externally air-assisted electrostatic nozzle

Cited by 17 publications

References 27 publications

Review of electrostatic system parameters, charged droplets characteristics and substrate impact behavior from pesticides spraying

Review of electrostatic system parameters, charged droplets characteristics and substrate impact behavior from pesticides spraying

Feedback Control of the Spray Liquid Distribution of Electrostatically Assisted Coaxial Atomization

Computational Modeling and Experimental Evaluation of the Effects of Electrode Geometry and Deposition Target on Electrostatic Spraying Processes

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