Abstract
Herein we report an experimental study on the electrohydrodynamic (EHD) spraying in cone-jet mode. The effects of electric field strength, surrounding ambient fluid, surface tension of the working fluid, pressure head in the working fluid supply line and the electrodes configuration of the apparatus for spraying were investigated. The working fluid, ethanol or water, of different surface tension was issued out into the surrounding fluid, air or CO2 gas, by using a needle-plate apparatus for EHD spraying. The formation of the cone-jet at the needle tip was monitored by using a hypervideo microscope. The droplet size and velocity were measured by using a Phase Doppler Particle Analyzer. The results indicate that a stable cone formed in CO2 gas in a certain range of the applied voltage for either ethanol or water, while it takes place for only ethanol sprayed in air. The droplet size decreased with increasing applied voltage and is of order of 2- 4 μn for both ethanol and water when produced in stable cone-jet mode.
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