Review on Hydrodynamics of Liquid Droplets Production Using Electro-Spraying Method

Electro-spraying is a process in which the electric field is applied as an external force to the surface of a liquid capillary to control the size and size distribution of produced droplets. Electric filed exert an external force on the surface of a conductive liquid at nozzle tip in addition of gravitational force. These forces overcome surface tension and leading to elongation of meniscus and consequently separation of droplets. Smaller droplets could be overcoming on surface tension force using a higher electric force. On the other hand, it is possible to produce droplets with desire size and uniform size distribution by changing the external applied electric force. Electro-spraying is one of the known process which able to spraying the liquids into the very small droplets in range of micrometer and nanometer. The aim of this paper is the reviewing of droplets production in electro-spraying method and investigation on the effect of different parameters on the modes of this process.