A capacitive type of electrostatic spraying nozzle

Moon, Jae-Duk; Lee, Donghyeon; Kang, Taegyoung; Yon, Kwang-Seok

doi:10.1016/s0304-3886(02)00173-0

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…When spraying at the minimum distance from the target, the charge/mass ratio was 4.11 mC kg -1 , while for the distance of 5 m, the ratio was 0.052 mC kg -1 ( Figure 2). Similar results were found by Moon et al (2003) e Zhao et al (2008).…”

Section: Resultssupporting

confidence: 89%

Parameters of electrostatic spraying and its influence on the application efficiency

et al. 2013

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When the electrostatic spraying is used correctly, it provides advantages over conventional systems, however many factors can affect the system efficiency. Therefore, the objective of this study was to evaluate the charge/mass ratio (Q/M) at different spraying distances (0, 1, 2, 3, 4 and 5 m), and the liquid deposition efficiency on the target. Evaluating the Q/M ratio the Faraday cage method was used and to evaluate the liquid deposition efficiency the artificial targets were positioned longitudinally and transversely to the spray jet. It was found that the spraying distance affects the Q/M ratio, consequently, the liquid deposition efficiency. For the closest distance to the target the Q/M ratio was 4.11 mC kg-1, and at distances of 1, 2, 3, 4 and 5 m, the ratio decreased to 1.38, 0.64, 0.31, 0.17 and 0.005 mC kg-1, respectively. For the liquid deposition, the electrostatic system was affected by the target orientation and spraying distance. The target transversely to the jet of liquid did not improve the liquid deposition, but longitudinally increased the deposition up to 3 meters of distance.

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Section: Resultssupporting

confidence: 89%

Parameters of electrostatic spraying and its influence on the application efficiency

et al. 2013

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“…This correlation can be applied to the other references in table 2, as shown in table 5. The model fits the data from the literature reasonably well, with the exception of Moon et al (2003), who used a pulse-capacitive charging system with a swirl nozzle, which is different from the systems used by most other authors. Figure 6 shows a plot of droplet charge per unit mass (q/m) at 5% and 10% of the Rayleigh limit versus droplet size for water.…”

Section: Correlationsmentioning

confidence: 55%

“…Charging Slope (mC kg -1 kV -1 ) Model (eq. 10) (mC kg -1 kV -1 ) Moon et al (2003) 2.10 3.0 65 0.75 0.70 0.28 Jia et al (2015) 1.00 4.0 84 0.33 0.25 0.29 Marchant and Green (1982) 1.31 6.0 155 0.17 0.22 0.16 Gan-Mor et al (2014) 1.85 10.5 115 0.45 0.18 0.16 Ru et al (2011) 2.35 20.0 81 0.67 0.12 0.22 Laryea and No (2003) 0.37 5.0 113 0.69 0.07 0.12…”

Section: Resultsmentioning

confidence: 99%

“…As shown in table 2, only eight publications could be found that reported simultaneous measurements of droplet size and spray charge. Most modern electrostatic sprayers use induction charging, although Ru et al (2011) used co- Scherm et al (2007) 7.80 30 1.1 Not given 129 6.0% Martin and Carlton (2013) [a] 1.63, 0.89 85, 92 6.0, 6.0 0.42, 0.85 27.2, 24.1 6.0%, 3.7% Moon et al (2003) 2.10 65 3.0 0.75 40.6 5.2% Jia et al 20151.00 84 4.0 0.33 [b] 27.6 3.6% Laryea and No (2003) 0.37 113 5.0 0.69 17.7 2.1% [a] Martin and Carlton (2013) reported data for 20 trials. The maximum and minimum F values are shown here.…”

Section: Droplet Size and Charge Measurementsmentioning

confidence: 99%

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A Review of the Effects of Droplet Size and Flow Rate on the Chargeability of Spray Droplets in Electrostatic Agricultural Sprays

Post¹,

Roten²

2018

Transactions of the ASABE

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Abstract. The chargeability of liquid sprays is an important factor in determining the deposition efficiency of electrostatic pesticide sprays. The Rayleigh limit provides information on the maximum amount of charge a spray droplet can carry as a function of droplet size and liquid properties. This article reviews the literature to determine what fraction of the Rayleigh limit is achievable. Typically, less than 10% of the Rayleigh limit charge is obtained. The droplet charge per unit mass decreases with increasing droplet size and liquid flow rate. A correlation equation is derived from published data to predict spray droplet charge per unit mass from droplet size, flow rate, and charging voltage. Keywords: Droplet size, Electrostatic charging, Spray drift, Sprayers, Ultra-low volume spraying.

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“…In the electrostatic system, nozzles' capability to produce desirable charged droplet sizes and coverage at minimal spray drift determines application efficiency. A capacitive nozzle type with ring electrode embodiment has been used to provide high electrical charge outside droplets breakup point, which resulted in maximum spray deposition on targeted substrates [48] . In earlier studies, air-assisted twine-type, flat fan, and spinning disc nozzles were commonly mounted for an electrostatic pesticide spraying [49] .…”

Section: Nozzle Type and Electrode Materialsmentioning

confidence: 99%

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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A capacitive type of electrostatic spraying nozzle

Cited by 10 publications

References 7 publications

Parameters of electrostatic spraying and its influence on the application efficiency

Parameters of electrostatic spraying and its influence on the application efficiency

A Review of the Effects of Droplet Size and Flow Rate on the Chargeability of Spray Droplets in Electrostatic Agricultural Sprays

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

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