An advance air-induced air-assisted electrostatic nozzle with enhanced performance

Patel, M.; Praveen, Bushra; Sahoo, Hemant Kumar; Patel, Bharat; Kumar, Ashwani; Singh, Manjeet; Nayak, Manoj K.; Rajan, Pradeep

doi:10.1016/j.compag.2017.02.010

Cited by 55 publications

(47 citation statements)

References 34 publications

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“…Since nozzle type affects droplets charging property, understanding charging mechanisms are important to enhance the charged droplets trajectories and deposition. The need for a specialized sprayer for pesticide application led to the introduction of an air-assisted electrostatic nozzle working under the combined principle of induction charging and air-assisted nozzle in India [24] . All nozzles meant for electrostatic spraying of pesticides should be able to increase ground spray coverage to enhance the efficiency of spraying at minimum wear rate.…”

Section: Nozzle Type and Electrode Materialsmentioning

confidence: 99%

“…A 1.6 mm electrode distance resulted in a reduction of charge-mass ratio up to 13%-18% [37,38] . Due to an interactive effect of Coulombic forces on charged liquid droplets, an electrodeposition in the nozzle aperture should be relatively close to the ruptured liquid film to enhance droplets charging effectivity [24,57] . Besides the electrode material, the relative positions of the electrode connote in-depth research into optimization selection for pesticide spraying.…”

Section: Nozzle Type and Electrode Materialsmentioning

confidence: 99%

“…Electrode gap that considerably increases droplets chargeability will be a welcome innovative strategy to enhance pesticide spray deposition. The overall effect indicates that the closer the gap, the better the chargeability of droplets, however, to prevent the destruction of electrode material and charged droplets atomization, it is essential to seize electrode charging wettability [24] .…”

Section: Nozzle Type and Electrode Materialsmentioning

confidence: 99%

“…Yamane and Miyazaki [37] indicated that raising applied voltage to 4 kV increased charge-mass ratio of spray droplets in electrostatic spraying to 0.45 mC/kg at 2.6 L/min flow rate, without electrode-charge leakage but a further appreciation of the voltage from 6.0-8.5 kV rather decreased droplet chargeability. By applying 2.0-4.0 bar spraying pressures at a flow rate of 150 mL/min, droplet charges increased with an increasing applied voltage, reached maximum, stabilized and began to decrease upon increasing applied voltages [24] . The increasing pressure reduced droplet sizes with an entrained higher charge than lower pressures that produced larger droplet sizes with lower chargeability.…”

Section: Applied Voltage Pressure and Flow Ratementioning

confidence: 99%

“…The system properties include nozzle type, angle, electrodeposition and size, apply voltage, pressure, flow rate, nozzle spacing and spraying height or distance. Thanks to the electrostatic spraying, the environmental pollution caused by pesticides spraying on non-target sites have been reduced [16,24] . Since electrostatic spraying was applied in pesticide spraying, several parameters have been tested to achieve suitable parameter combinations for efficient application [25] , but without optimization selection.…”

Section: Introductionmentioning

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: Nozzle Type and Electrode Materialsmentioning

confidence: 99%