Liquid Ejection Characteristics of Piezoelectric Inkjet Printhead for Varied Work Liquids

Abstract

This research applied computational fluid dynamics in the study of liquid ejection characteristics of a piezoelectric inkjet printhead for varied work liquids. The results of the fixed work liquid viscosity coefficient and the change of surface tension showed that larger surface tension increases the flying speed of the ejected droplet, but irregularity may occur if the viscosity coefficient is too small. Also, given fixed surface tension of the work liquid and changed viscosity coefficient, larger viscosity coefficient increases the tendency of the liquid surface in the nozzle to move toward the pressure chamber, and decreases the flying speed of the ejected droplet. When the nozzle diameter is changed, smaller nozzle diameter produces faster ejected droplet flying speed.

The authors extend cordial thanks to Dr. J.-C. Yang, ITRI, Taiwan, for his assistance to this research.

Notes

Remarks:

1. The work liquid is water.

2. The work liquid is ink.

3. The computational cycle starts from 100–144 µs of the triangular wave according to Figure 2.