Abstract:Electrostatic charging of sprayed pesticide was realized in electrostatic spray nozzle design, which improved plant coverage and reduced wasted pesticide as well as soil pollution. The performance of electrostatic spray nozzles depended on the charge to mass rate of droplets. The preface illustrated six factors that can impact on the efficiency of the induction nozzle and the electrostatic spraying agricultural application, including nozzle geometry, nozzle air pressure, nozzle flow rate, applied voltage, electrode geometry, electrode position and materials, the properties of the sprayed liquid used and environment factors around the spray. In order to study the effect of electrode material on atomization characteristics and charge performance of electrostatic nozzle, optimize the spray parameters and explore the influence of electrostatic force on spray deposition, four experimental variables were designed, including the electrode material, electrode voltage, spray pressure and hole diameter of electrostatic nozzle, and the indoor atomization and deposition test were carried out. The results showed that the optimal electrode voltage was 8kV, the optimal electrode material was copper and the optimal spray pressure was 1.7×105Pa. Compared with non-electrostatic spraying, the spray swath width of electrostatic nozzle was increased by 50cm. Of all droplets, the electrostatic force had the most effect on the droplets (between 50μm and 120μm), making the deposition amount double. And the spray droplet density was decreased as the droplet size was increased over 120μm. The size of the most droplets deposited on target was under 180μm. Therefore, those electrostatic nozzles designed were suitable for crops whose optimum biological size was 180μm or under 180μm.
