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Long and slender liquid filaments are produced during inkjet printing, whichcan subsequently either retract to form a single droplet, or break up to form aprimary droplet and one or more satellite droplets. These satellite dropletsare undesirable since they degrade the quality and reproducibility of theprint. Existing strategies for the suppression of satellite droplet formationinclude, among others, adding viscoelasticity to the ink. In the present work,we aim to improve the understanding of the role of viscoelasticity insuppressing satellite droplets in inkjet printing. We demonstrate that verydilute viscoelastic aqueous solutions (concentrations $\sim$ 0.003\% wt.polyethylene oxide (PEO), corresponding to nozzle Deborah number $De_{n}$$\sim$ 3) can suppress satellite droplet formation. Furthermore, we show that,for a given driving condition, upper and lower bounds of polymer concentrationexist, within which satellite droplets are suppressed. Satellite droplets areformed at concentrations below the lower bound, while jetting ceases forconcentrations above the upper bound (for fixed driving conditions). Moreover,we observe that, with concentrations in between the two bounds, the filamentsretract at velocities larger than the corresponding Taylor-Culick velocity forthe Newtonian case. We show that this enhanced retraction velocity can beattributed to the elastic tension due to polymer stretching, which builds upduring the initial jetting phase. These results shed some light on the complexinterplay between inertia, capillarity, and viscoelasticity for retractingliquid filaments, which is important for the stability and quality of inkjetprinting of polymer solutions.

The retraction of jetted slender viscoelastic liquid filaments