Electrospraying modes from capillary and mechanical analysis
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinjusi, Gyeongnam 660701, Korea
Abstract：Based on microscopic highspeed camera technology, the electrospraying visualization of anhydrous ethanol was investigated in stainless steel singlecapillary. Based on the outlet of capillary meniscus and the formation of microjet or droplet morphology, the electrospraying modes of anhydrous alcohol and the transformation process were analyzed. The typical sprayingmodes include dripping, microdripping, spindle, multispindle, oscillatingjet, precessionjet, conejet and multijet modes. The forces acting on microjet and droplets under different sprayingmodes were analyzed, and the relationship between force and motion pattern of microjet, droplet and sprayingmodes was discussed. The results indicate that the capillary electrospraying modes are closely associated with applied voltage. With the increasing of voltage, the electrospraying modes gradually transform from dripping, spindle modes to conejet and multijet modes with orderly transition. For different electrospraying modes, gravity, electric field force, resistance, surface tension, dielectric electrophoretic force and deformation force play different roles on motion pattern and trajectory of microjet or droplet. For low electric field strength, the gravity dominates the droplet motion, and the droplet becomes spherical under the surface tension. For high electric field strength, the electric field force dominates the motion of microjet or droplets, and it shows various electrospraying modes under different electric forces.
2017, Vol. 38 
