Pulsed coaxial drop-on-demand electrohydrodynamic printing

This research demonstrates pulsed electrohydrodynamic drop-on-demand (DoD) printing as a novel technique for synthesizing core–shell microparticles in controlled manner. In this regard, multiphase and multiphysics model is presented coaxial printing. The governing partial differential equations of the are discretized using finite element method, suitable numerical scheme adopted to solve system equations. experimental results literature used validate model. Utilizing validated model, effects continuous-direct current (DC) voltage pulsed-DC examined on behavior compound meniscus (composed ethylene glycol core olive oil shell) droplet formation process. According obtained, onset 3330 V, which agrees with scale analysis. Furthermore, increasing continuous-DC longer breakup length, shorter time, faster velocity, jetting start time. addition, duration leads an increase length velocity. Most importantly, it possible control inertia spindle by controlling magnitude ensure that separates from every pulse shortest minimum satellite droplets possible. It generally recommended keep amplitude low enough prevent long irregularities printed pattern; however, they must be sufficiently large sustain micro-dripping mode.