Electrostatic atomization of viscous liquid for liquid-liquid system was investigated. The size of droplet produced by the electrostatic atomization was decreased with increasing applied potential and controlled in the wide range of mm order to several μm. Also, the size distribution was sharp compared with that produced by other atomiza-tion methods using pressure atomizer, twin-fluid atomizer and ultrasonic vibration. In the case of low viscous kerosene, the relatively uniform droplets were regularly produced from the cusp of meniscus which was formed at the tip of the nozzle. At the potential above -3000V, very fine droplets can be produced. On the other hand, in the case of high viscous-castor oil, the liquid thread was drawn out from the meniscus and then disintegrated into small droplets. The liquid viscosity depends on the produced droplet sizes. It was consi-dered that electrostatic atomization was induced by synergistic effects both the transverse vibration and the axial acceleration of the liquid jet issuing from the nozzle.
