Modeling of sessile droplet oscillation on electrohydrodynamic jetting nozzle at constant back pressure

Abstract

In this study, we present a theoretical model for an oscillating meniscus along with changing the volume of the sessile droplet on the electrohydrodynamic nozzle under various voltage waveforms, supported by experimental data. The transient volume change of the sessile droplet upon step electric pressure was modeled by a one-dimensional flow. The meniscus oscillation upon cyclic electric pressure was analyzed by a harmonic oscillator model. By combining these two models, the behavior of the sessile droplet, under a bi-directional square voltage pulse train with a different bias voltage, was analyzed. It is expected that this theoretical model can provide effective information in optimizing the voltage waveform for drop-on-demand electrohydrodynamic jetting.