Abstract
This paper describes a lattice Boltzmann-based binary fluid model for inkjet printing. In this model, a
time-dependent driving force is applied to actuate the droplet ejection. As a result, the actuation can
be accurately controlled by adjusting the intensity and duration of the positive and negative forces, as
well as the idle time. The present model was verified by reproducing the actual single droplet ejection
process captured by fast imaging. This model was subsequently used to investigate droplet formation
in piezoelectric inkjet printing. It was determined that the wettability of the nozzle inner wall and the
surface tension of the ink are vital factors controlling the print quality and speed. Increasing the contact
angle of the nozzle inner delays the droplet breakup time and reduces the droplet velocity. In contrast,
higher surface tension values promote earlier droplet breakup and faster drop velocity. These results
indicate that the hydrophilic modification of the nozzle inner wall and the choice of inks with high
surface tensions will improve printing quality.
Users
Please
log in to take part in the discussion (add own reviews or comments).