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Pulsating jet is one of the common working modes in electrohydrodynamicprinting (EHDP) that process is highly affected by operating parameters andmaterial properties. In this paper, the processes of pulsating jet for liquidswith different physical properties were investigated using numericalsimulation. An electrohydrodynamic solver was established, and a charge fluxrestricting step was adopted to ensure a realistic distribution of freecharges. Three various ejection regimes were observed in our simulations:oscillating cone (OC), choked jet (CJ), and stable cone-jet (SJ). We found thatthree dimensionless numbers relating to liquid properties determined theejection regime: the Ohnesorge number, Q0{\epsilon}r/Q, and Q0/(QRe). Based onthose dimensionless numbers, the roles of liquid properties on pulsating jet(OC and CJ) were analyzed. In OC, the break of the jet is due to thesignificant oscillation of the Taylor cone, which is mainly affected byviscosity and conductivity. In CJ, the jet emission is terminated by theexcessive resistant force in the cone-jet transition region. For liquids withlow and medium viscosity, the dominant resistant force is the polarizationforce or viscous force when {\epsilon}rRe is larger or smaller than 1,respectively. For high viscosity liquids, the viscous force always becomes themajor resistance. These results further reveal the physical mechanism ofpulsating jet and can be used to guide its application.

Numerical study on the effects of fluid properties in electrohydrodynamic pulsating jet under constant voltage