Spray angle and breakup length of charge-injected electrostatic pressure-swirl nozzle

Laryea, Gabriel Nii; No, Soo-Young

doi:10.1016/j.elstat.2003.11.001

Cited by 40 publications

(24 citation statements)

References 5 publications

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“…In the 21st century, this technology is expected to be applied more widely by increasing charged droplets deposition on difficult-to-reach substrates [32] . The technology has radically changed the face of pesticide application where pests residing at both abaxial and adaxial leaf surfaces are completely exterminated, as well as enhancing efficiency and bio-efficacy of spraying on target substrates [15,33] . Electrostatic application principles for pesticides spraying are classified into three interlinked phases of electrodynamicsconsisting of electrode selection, configuration and superposition of electrode charge to spray droplets; hydrodynamics -liquid flow and atomization in the nozzle; and aerodynamics -final phase where break-up charged droplets are directed to target substrates to cause-effect ( Figure 1) [34,35] .…”

Section: Electrostatic Spraying Application Of Pesticidesmentioning

confidence: 99%

“…Though the application system improves on static properties of spray on adaxial surfaces, approaches that furtherly enhance dynamic behavior of droplets on both abaxial and adaxial surfaces can bridge most spraying inefficiency. Such an innovative approach should concentrate more droplets on substrates to prevent drift and rebound by superposition of charges to spray droplets [8,14,15] . For an efficient application, pesticides must reach target substrates for interactive effect so that the product ingredient can impact positively with reduced drift.…”

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: Electrostatic Spraying Application Of Pesticidesmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Another important performance parameter is the spray cone angle that determine the coverage and dispersion of spray in the surrounding ambiance or combustion chamber. [1] have studied the relationship between applied voltage and injection pressure on liquid breakup length and spray angle of charge-injected electrostatic pressure swirl nozzle. They reported that an increase in applied voltage and injection pressure increases the value of spray cone angle.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The main function of rocket injector is to atomize the fuel to a very fine droplets. It is known that one of the methods to improve combustion effiency of liquid fuel is to reduce the droplet size and hence to improve the quality of atomization [1].…”

Section: Introductionmentioning

confidence: 99%

Spray cone angle and air core diameter of hollow cone swirl rocket injector

Abdul Hamid

2011

IIUMEJ

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: Fuel injector for liquid rocket is a very critical component since that small difference in its design can dramatically affect the combustion efficiency. The primary function of the injector is to break the fuel up into very small droplets. The smaller droplets are necessary for fast quiet ignition and to establish a flame front close to the injector head, thus shorter combustion chamber is possible to be utilized. This paper presents an experimetal investigation of a mono-propellant hollow cone swirl injector. Several injectors with different configuration were investigated under cold ï¬‚ow test, where water is used as simulation fluid. This investigation reveals that higher injection pressure leads to higher spray cone angle. The effect of injection pressure on spray cone angle is more prominent for injector with least number of tangential ports. Furthermore, it was found that injector with the most number of tangential ports and with the smallest tangential port diameter produces the widest resulting spray. Experimental data also tells that the diameter of an air core that forms inside the swirl chamber is largest for the injector with smallest tangential port diameter and least number of tangential ports.ABSTRAK : Injektor bahan api bagi roket cecair merupakan satu komponen yang amat kritikal memandangkan perbezaan kecil dalam reka bentuknya akan secara langsung mempengaruhi kecekapan pembakaran. Fungsi utama injektor adalah untuk memecahkan bahan api kepada titisan yang amat kecil. Titisan kecil penting untuk pembakaran pantas secara senyap dan untuk mewujudkan satu nyalaan di hadapan, berhampiran dengan kepala injektor, maka kebuk pembakaran yang lebih pendek berkemungkinan dapat digunakan. Kertas kerja ini mebentangkan satu penyelidikan eksperimental sebuah injektor ekabahan dorong geronggang kon pusar. Beberapa injektor dengan konfigurasi berbeza telah dikaji di bawah ujian aliran sejuk, di mana air digunakan sebagai bendalir simulasi. Kajian ini mendedahkan bahawa suntikan bertekanan tinggi menghasilkan sudut semburan kon yang besar. Kesan tekanan suntikan ke atas sudut semburan kon lebih ketara pada injektor yang mempunyai lubang tangen yang kurang Tambahan pula, injektor yang mempunyai jumlah lubang tangen yang paling banyak dan lubang tangen berdiameter paling kecil menghasilkan semburan yang paling lebar. Data eksperimental juga menunjukkan bahawa diameter teras udara terbesar terhasil di dalam kebuk pusar injektor yang mempunyai diameter lubang tangen terkecil dan jumlah lubang tangen yang paling kurang.

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“…Laryea and No [9] investigated the cone half-angle of the spray produced by an effervescent diesel injector as a function of GLR, injection, and ambient pressures. Their results showed that increasing the ambient pressure causes a nonlinear decrease in the spray angle, followed by an increase that ultimately approaches an asymptotic value when the pressure reaches 5 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of flow conditions on spray cone angle of a two-fluid atomizer

et al. 2011

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A visual study is conducted to determine the effects of operating conditions on the spray cone angle of a two-fluid atomizer. The liquid (water) jets exit from peripheral inclined orifices and are introduced into a high-speed gas (air) stream in the gravitational direction. Using a high-speed imaging system, the spray cone angle is determined for Reynolds numbers ranging from 4×10 4 to 9×10 4 and different Weber numbers up to 140. The droplet sizes (Sauter mean diameter) and their distributions are determined using a Malvern Mastersizer X. The results show that the spray cone angle depends on the operating conditions, especially in lower values of Reynolds and Weber numbers. An empirical correlation is also obtained to predict the spray cone angle in terms of these two parameters.

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Spray angle and breakup length of charge-injected electrostatic pressure-swirl nozzle

Cited by 40 publications

References 5 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

Spray cone angle and air core diameter of hollow cone swirl rocket injector

Effect of flow conditions on spray cone angle of a two-fluid atomizer

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