numerical simulation of highly charged droplets dynamics with primary break-up in electrospray at sub rayleigh limit

The size and the axial and radial velocity distributions of electrically controlled droplets generated from taylor cone operating in the stable cone-jet regime are simulated by numerical modeling of electrosprays. a model is formulated as function of liquid flow rate, needle-to-counter electrode distance, applied voltage, and electrical conductivity and surface tension of the liquid in a dc electric field is presented with a 2d electrohydrodynamic model. the droplet size reduction can be explained by evaporation and/or coulomb explosion. results show that moving downstream, the average velocity of droplets decreases monotonically. this paper reports a numerical study of the effects of an externally applied electric field on the dynamics of drop formation from a vertical metal capillary. the fluid issuing out of the capillary is a viscous liquid, the surrounding ambient fluid is air, and the electric field is generated by establishing a potential difference between the capillary and a horizontal, electrode placed downstream of the capillary outlet. the primary jet break-up and droplet transport and evaporation of electrohydrodynamic sprays is investigated by modeling of droplet size and velocity distribution in spray cones and a series of drop migrations under the influence of an electric field were carried out and the results are in good agreement with other theoretical and experimental studies.